Diagnostics and testing (Discovery 3)

Review

The DD295 transfer case is a permanent four-wheel drive unit, with a 50/50 ratio of torque distributed between the front and rear driveshafts, and it is identical for all engine variants. For more information, refer to Section 308-07 "Four-wheel drive systems" in the Service station manual.

Inspection and verification

1. Ensure that the customer's complaint is justified.

2. Confirm which, if any, warning lights and/or messages are illuminated/displayed on the instrument cluster. For a list of messages, refer to the relevant section in the workshop manual.

3. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors	Electrical factors
Transfer case Oil leaks Cardan shafts Half shafts Constant velocity joints (CV joints)	Fuse(s) Wiring harness/electrical connectors CAN electrical circuits (Control Area Network) Instrument panel Range selection switch Transfer Case Control Module

4. If an obvious cause for the problem you identified or the customer described is found, resolve it before moving on to further action. (if possible).

5. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before referring to the Symptom Chart or DTC Index.

Clear all DTCs after troubleshooting.

Table of signs of malfunction

Sign of malfunction	Message	Possible reasons	Actions
Loss of transmission due to transfer case being stuck in neutral and transmission park lock function not working	'PARK LOCK FAILURE APPLY HANDBRAKE' (ACTIVATE PARKING BRAKE DUE TO FAILURE OF PARKING LOCK FUNCTION)	Transfer Case Control Module CAN Bus - Bus Off When Range Changes Transfer case shift solenoid valve malfunction Transfer case electric motor malfunction Internal interference in the transfer case	Refer to the "Network Communication" section in the service station manual.
Loss of motion transmission	-	Half shaft failure Cardan shaft malfunction Front or rear axle: differential fault Transfer case center differential malfunction	Check the condition of the cardan shafts, axle shafts and constant velocity joints.
Range Change Lock	'TRANSMISSION RANGE CHANGE INOPERATIVE' (GEARBOX RANGE CHANGE DOESN'T WORK)	Transfer case control module shut down due to thermal overload Internal interference in the transfer case Transfer case shift solenoid valve malfunction Transfer case electric motor malfunction Transfer case control module malfunction	Check for DTCs related to the Transfer Case Control Module
	'TRANSMISSION OVER HEAT SLOW DOWN' (REDUCE SPEED DUE TO GEARBOX OVERHEATING)	The temperature of the center differential is approaching the threshold for overheating	Check for Over Temperature DTCs
Reduced traction off-road	'TRANSMISSION FAULT - TRACTION REDUCED' (GEARBOX FAILURE - REDUCED TRACTION EFFORT)	The center differential has failed - it operates as an open differential The transfer case control module has stopped transmitting data on the CAN bus and has defaulted to an open center differential	Check for DTCs related to loss of data transmission and bus shutdown.

DTC Index

NOTE: Generic scan tools cannot read the codes listed or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault. (the last 2 digits provide additional information readable by a manufacturer approved diagnostic system).

Reboot by turning ignition off and on

There are references to "ignition cycle reset" in the DTC Index. This is where the module should be reset by completely cycling the power.

DTC codes	Description	Possible reasons	Actions
C1A0196	LED	LED electrical circuit: short circuit to ground High resistance	Check the LED and electrical circuits. Refer to the electrical equipment manual.
C1A0294	The steering angle encoder is stuck in the middle position	The rotary switch was detected to be between detent positions for more than 1 minute	Check the operation of the rotary switch.
P056000	Voltage in the system	Backup battery failure Low battery voltage Battery ground cable: high resistance Loose/corroded battery connections Battery current leakage	Check the battery condition and charge. Refer to the relevant section in the service station manual.
P056100	Unstable voltage in the system	The battery is disconnected and connected Loose/corroded battery connections Intermittent fault in battery ground wire: high resistance Intermittent fault in positive battery cable: high resistance	Check the battery condition and charge. Refer to the relevant section in the service station manual.
P056200	Low voltage in the system	Low battery voltage Battery ground cable: high resistance Loose/corroded battery connections Battery current leakage	Check the battery condition and charge. Refer to the relevant section in the service station manual.
P056300	High voltage in the system	There was a high voltage supply to the system High battery voltage Generator Overcharge Condition	Check whether the vehicle was started from an external battery using connecting wires. Check the status and charging of the battery. Refer to the corresponding section in the service station manual.
P060700	Problems in the performance of the control module	ECM - Event Information - CPU Control Function	Check the ECM electrical circuits and connectors. Refer to the electrical manual. Clear the DTCs. Cycle the ignition to perform a reset by turning the ignition off and on and retest. If the DTC is generated again, suspect the ECM. If the module is suspected, refer to the warranty policy and procedures manual.
P063400	PCM/ECM/TCM Internal Temperature Too High A	Shutdown due to excess temperature of the output amplifier stage of the transfer case electric motor Internal TCSM sensor error	Before doing anything else, consider the customer's weather conditions and driving habits. Consult the electrical manual and check the TCC circuits. If the module is suspected, consult the warranty policy and procedures manual.
P064100	Electrical circuit of reference voltage A of the sensor	Transfer Case Motor Hall Effect Sensor Power Circuit High Resistance Transfer Case Motor Hall Effect Sensor Ground Circuit High Resistance Transfer case electric motor Hall sensor malfunction Transfer case control module malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P064200	Low Reference Voltage in Sensor Circuit A	Transfer Case Motor Hall Effect Sensor Power Circuit: Short to Ground Transfer Case Motor Hall Effect Sensor Power Circuit High Resistance Transfer case electric motor Hall sensor malfunction Transfer case control module malfunction	Refer to the electrical guide and check the transfer case Hall Effect Sensor signal circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P064300	High Reference Voltage in Sensor Circuit A	Transfer case electric motor Hall sensor power supply circuit: short circuit to battery + Transfer case electric motor Hall sensor malfunction Transfer case control module malfunction	Refer to the electrical guide and check the transfer case Hall Effect Sensor signal circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P065200	Low Reference Voltage in Sensor Circuit B	Shift Position Sensor Power Circuit Short to Ground Shift Position Sensor Power Circuit High Resistance Gear shift position sensor malfunction	Refer to the electrical guide and check the shift position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P065300	High Reference Voltage in Sensor Circuit B	Gear Shift Position Sensor Power Circuit: Short to Battery + Gear shift position sensor malfunction	Refer to the electrical guide and check the shift position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P066600	PCM/ECM/TCM Internal Temperature Sensor "A" Circuit	Shutdown due to excess temperature of the output amplifier stage of the electromagnetic switching valve	Check for over temperature DTCs in other modules If a module is suspected, refer to the warranty policy and procedures manual.
P069800	Low reference voltage in sensor circuit C	Manual Transmission Output Shaft Speed Sensor Circuit Short to Ground Manual Transmission Output Shaft Speed Sensor Circuit High Resistance Manual Transmission Output Shaft Speed Sensor Malfunction:	Refer to the electrical guide and check the output shaft speed sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P069900	High Reference Voltage in Sensor Circuit C	Manual Transmission Output Shaft Speed Sensor Circuit: Short to Battery + Malfunction of the secondary shaft speed sensor of the manual transmission:	Refer to the electrical guide and check the output shaft speed sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P070200	Electrical fault in the transmission control system	Unexpected reconfiguration Short circuit of battery to ground Generator electrical circuit: short circuit to ground TCSM power supply circuit: short circuit to ground	Check for intermittent loss of power or ground faults in the main power circuits to the module. Refer to the electrical manual.
P071200	Low Voltage in Transmission Fluid Temperature Sensor "A" Circuit	Transfer Case Motor Temperature Sensor Circuit Short to Ground Transfer case electric motor temperature sensor malfunction	Check the transfer case motor temperature sensor and electrical circuits. Refer to the electrical manual.
P071300	Transfer Case Motor Temperature Sensor Circuit A	Transfer Case Electric Motor Temperature Sensor Electrical Circuit: Short to Battery + Transfer Case Motor Temperature Sensor Circuit High Resistance Transfer case electric motor temperature sensor malfunction	Check the transfer case motor temperature sensor and electrical circuits. Refer to the electrical manual.
P071500	Turbine/Input Shaft Speed Sensor A Circuit	Transmission Output Shaft Speed Sensor Circuit Short to Ground Gearbox output shaft speed sensor malfunction	Check the transmission output shaft speed sensor and electrical circuits. Refer to the electrical manual.
P071600	Turbine/Input Shaft Speed Sensor A Circuit Range/Performance Problem	Transmission Output Shaft Speed Sensor Circuit Short to Ground Gearbox output shaft speed sensor malfunction	Check the transfer case motor temperature sensor and electrical circuits. Refer to the electrical manual.
P071700	No signal in the electrical circuit of the turbine/input shaft speed sensor A	The gearbox output shaft speed sensor is disconnected Transmission Output Shaft Speed Sensor Circuit Short to Ground Transmission Output Shaft Speed Sensor Circuit High Resistance Gearbox output shaft speed sensor malfunction	Check the transfer case motor temperature sensor and circuits. Refer to the electrical manual. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P078000	Gear shift malfunction	Gear shifting is blocked(the movement and position of the transfer case electric motor does not correspond to the expected values)	Check the transfer case motor wiring and the hall sensor wiring of the transfer case motor. Check the transfer case's electric motor. Refer to the electrical equipment manual.
P080600	Clutch Position Sensor Circuit Range/Performance Problem	Clutch and range change mechanism calibration failure	Calibrate the clutch and range change mechanism using an approved diagnostic system or according to the procedure specified in the Design and Operation Description. Refer to the appropriate section in the workshop manual.
P080700	Low Voltage in Clutch Actuator Position Sensor Circuit	Transfer Case Motor Hall Effect Sensor Signal Circuit Short to Ground Transfer case electric motor Hall sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P080800	Clutch Actuator Position Sensor Circuit High Voltage	Transfer Case Electric Motor Hall Effect Sensor Signal Circuit: Short to Battery + Transfer Case Motor Hall Effect Sensor Signal Circuit High Resistance Transfer case electric motor Hall sensor malfunction	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P082000	Gear Shift Lever XY Position Sensor Circuit	Shift Position Sensor Signal Circuit Short to Ground Shift Position Sensor Signal Circuit Short to Battery Positive Shift Position Sensor Signal Circuit High Resistance Gear shift position sensor malfunction	Refer to the electrical guide and check the transmission XY position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P082600	Upshift and downshift electrical circuit	Activation of the transmission high/low range switch for too long or simultaneous activation of the high and low range switches High/low range switch of the transmission is pressed for more than 255 seconds Switch cluster wiring harness: short to ground, short to battery, high resistance Switch block malfunction Transfer case control module malfunction	Check the operation of the transmission high/low range switch. Refer to the electrical manual and check the switch assembly circuit. Repair/replace as necessary. Refer to the guided diagnostic routine for this code on the approved diagnostic system. If the module is suspected, refer to the warranty policy and procedures manual.
P090000	Open circuit of the clutch actuator	Transfer Case Motor Circuit High Resistance Transfer case electric motor malfunction	Refer to the electrical guide and check the transfer case motor circuit. Repair/replace as necessary. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P090200	Clutch actuator electrical circuit	Transfer case motor electrical circuit: short circuit to ground Transfer Case Motor Circuit High Resistance Transfer case electric motor malfunction	Refer to the electrical guide and check the transfer case motor circuit. Repair/replace as necessary. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P090300	Clutch actuator electrical circuit	Transfer case motor electrical circuit: short circuit to battery + Transfer case electric motor malfunction	Refer to the electrical guide and check the transfer case motor circuit. Repair/replace as necessary. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P091500	Problems with the operating range/ characteristics of the electrical circuit of the gearshift position sensor	Shift Position Sensor Circuit Short to Ground Shift Position Sensor Circuit High Resistance Gear shift position sensor malfunction	Refer to the electrical guide and check the shift position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P091600	Low Voltage in Shift Position Sensor Circuit	Shift Position Sensor Circuit Short to Ground Shift Position Sensor Circuit High Resistance Gear shift position sensor malfunction	Refer to the electrical guide and check the shift position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P091700	High Voltage in Shift Position Sensor Circuit	Gear Shift Position Sensor Circuit Short to Battery Positive Shift Position Sensor Ground Circuit High Resistance Gear shift position sensor malfunction	Refer to the electrical guide and check the shift position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P173A00	Problems with the operating range/ characteristics of the electrical circuit of the clutch position sensor	Transfer Case Motor Hall Effect Sensor Signal Circuit Short to Ground Transfer Case Electric Motor Hall Effect Sensor Signal Circuit: Short to Battery + Transfer Case Motor Hall Effect Sensor Signal Circuit High Resistance Transfer case electric motor Hall sensor malfunction Transfer case control module malfunction	Refer to the electrical guide and check the transfer case motor hall sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P173B00	Low Voltage in Clutch Actuator Position Sensor Circuit	Transfer Case Motor Hall Effect Sensor Signal Circuit Short to Ground Transfer Case Motor Hall Effect Sensor Signal Circuit High Resistance Transfer case electric motor Hall sensor malfunction Transfer case control module malfunction	Refer to the electrical guide and check the transfer case motor hall sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P173C00	Clutch Actuator Position Sensor Circuit High Voltage	Transfer Case Electric Motor Hall Effect Sensor Signal Circuit: Short to Battery + Transfer Case Motor Hall Effect Sensor Signal Circuit High Resistance Transfer case electric motor Hall sensor malfunction Transfer case control module malfunction	Refer to the electrical guide and check the transfer case motor hall sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P173E00	Low voltage in ignition key removal interlock solenoid circuit	Ignition Key Removal Interlock Solenoid Circuit Short to Ground Ignition Key Removal Interlock Solenoid Circuit High Resistance Ignition key removal interlock solenoid malfunction:	Refer to the electrical guide and check the ignition key removal interlock solenoid circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P173F00	High voltage in the ignition key removal interlock solenoid circuit	Ignition Key Removal Interlock Solenoid Circuit: Short to Battery + Ignition key removal interlock solenoid malfunction:	Refer to the electrical guide and check the ignition key removal interlock solenoid circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P174A00	Low Voltage in Shift Lever X Position Sensor Circuit	Shift Position Sensor X-Axis Signal Circuit Short to Ground Gear shift position sensor malfunction	Refer to the electrical guide and check the transmission X-axis position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P174B00	High Voltage in Shift Lever X Position Sensor Circuit	X-axis gear shift position sensor signal circuit: short circuit to battery + X-axis shift position sensor signal circuit high resistance Shift Position Sensor Ground Circuit High Resistance Gear shift position sensor malfunction	Refer to the electrical guide and check the transmission X-axis position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P174C00	Low Voltage in Shift Lever Y Position Sensor Circuit	Y-axis shift position sensor signal circuit short to ground Gear shift position sensor malfunction	Refer to the electrical guide and check the transmission Y-position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P174D00	High Voltage in Shift Lever Y Position Sensor Circuit	Y-axis shift position sensor signal circuit: short circuit to battery + Y-axis shift position sensor signal circuit high resistance Shift Position Sensor Ground Circuit High Resistance Gear shift position sensor malfunction	Refer to the electrical guide and check the transmission Y-position sensor circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P180600	Battery short circuit in the high range indicator circuit of the 4-wheel drive system	LED electrical circuit: short circuit to battery + Switch block indicator malfunction Transfer case control module malfunction	Refer to the electrical manual and check the LED circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
P180700	4-wheel drive system high range indicator electrical circuit short circuit to ground	LED electrical circuit: short circuit to ground LED Electrical Circuit: High Resistance Switch block indicator malfunction Transfer case control module malfunction	Refer to the electrical manual and check the LED circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
P180800	4WD Low Range Indicator Circuit Malfunction	LED electrical circuit: short circuit to battery + Switch block indicator malfunction Transfer case control module malfunction	Refer to the electrical manual and check the LED circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
P181100	4-wheel drive system low range indicator short circuit to ground of the electrical circuit	LED electrical circuit: short circuit to ground LED Electrical Circuit: High Resistance Switch block indicator malfunction Transfer case control module malfunction	Refer to the electrical manual and check the LED circuit. Refer to the guided diagnostic program for this code on the approved diagnostic system.
P181B00	Low voltage in the electrical circuit of the solenoid valve of the clutch actuator	Electrical circuit of the clutch actuating device switching solenoid valve: short-circuit to ground Electrical circuit of the clutch actuating device switching solenoid valve: high resistance Clutch actuator shift solenoid valve malfunction Transfer case control module malfunction	Refer to the electrical guide and check the transfer case range selector solenoid circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P181C00	High voltage in the electrical circuit of the electromagnetic switching valve of the clutch actuating device	Electrical circuit of the clutch actuating device switching solenoid valve: short circuit to + battery Clutch actuator shift solenoid valve malfunction Transfer case control module malfunction	Refer to the electrical guide and check the transfer case range selector solenoid circuit. Refer to the guided diagnostic routine for this code on the approved diagnostic system.
P181D00	Clutch Actuator Shift Solenoid Valve Operating Range/Performance Problems	Transfer case electric motor wiring: short circuit to ground or to battery + Transfer case electric motor Hall sensor wiring: short circuit to ground or to battery + Transfer case electric motor or solenoid valve failure	Refer to the electrical manual and check the transfer case motor wiring and the transfer case motor Hall sensor wiring. Check the transfer case motor and the transfer case mode selector solenoid valve. Repair/replace as necessary.
P181E00	Clutch actuator operating range/performance issues	Lack of plausibility for transfer case motor current Transfer case electric motor wiring: short circuit to ground or to battery + Transfer case electric motor Hall sensor wiring: short circuit to ground or to battery + Transfer case electric motor or solenoid valve failure	Refer to the electrical manual and check the transfer case motor wiring and the transfer case motor Hall sensor wiring. Check the transfer case motor and the transfer case mode selector solenoid valve. Repair/replace as necessary.
P181F00	Problems with clutch control system performance	Lack of plausibility for the transfer case electric motor amplifier stage Transfer case electric motor wiring: short circuit to ground or to battery + Transfer case electric motor Hall sensor wiring: short circuit to ground or to battery + Transfer case electric motor or solenoid valve failure	Refer to the electrical manual and check the transfer case motor wiring and the transfer case motor Hall sensor wiring. Check the transfer case motor and the transfer case mode selector solenoid valve. Repair/replace as necessary.
P183A00	Range selection mechanism malfunction	The input and output speed of the transfer case does not change as required for changing the range Synchronizer lock defect	Refer to the electrical manual and check the transfer case motor wiring and the transfer case motor Hall sensor wiring. Check the transfer case motor and the transfer case mode selector solenoid valve. Repair/replace as necessary.
P186D00	Clutch actuator jamming	Actuator failure	Using the approved diagnostic system, calibrate the center differential clutch control module/actuator. Clear the DTCs and retest. If the problem persists, replace the actuator.
P271100	Unexpected mechanical disengagement of transmission	Transfer Case Control Module CAN Bus - Bus Off When Range Changes The transfer case is stuck in neutral position Transfer case shift solenoid valve malfunction Transfer case electric motor malfunction Internal interference in the transfer case	Check for DTC codes for network communication. Check the operation of the transfer case mechanism. Check the switching solenoid valve, electric motor, and electrical circuits. Refer to the electrical equipment manual.
P278500	Clutch actuator temperature too high	The actuator internal temperature sensor value is greater than 150°C. Continuous off-road use. Insufficient oil volume. Incorrect oil specification. Internal differential malfunction.	Check the customer complaint and vehicle usage at the time the DTC was recorded. Check the operation of the rear differential. Check the rear differential fluid level and specification. Refer to the appropriate section in the service manual. Clear the DTCs and retest. If the problem persists, replace the rear differential assembly. If the differential is suspected, refer to the warranty policy and procedures manual.
P278700	Coupling temperature too high	Clutch disc temperature exceeded	Check the condition of the clutch. Check for slippage. Calibrate if necessary using an approved diagnostic system. Consider atmospheric conditions before condemning the item.
P278900	Adaptive data collected for adhesion at the limit	The clutch is not calibrated Error while performing clutch calibration	Check the condition of the clutch. Calibrate if necessary using an approved diagnostic system.
P280600	Gearbox Range Sensor Alignment	Gear range sensor not calibrated Error while performing calibration of the transmission range sensor	If necessary, calibrate using an approved diagnostic system.
U007388	Disabling the "A" bus of the control unit data transmission	Bus Disabled: Traction Control Module (TCCM) Bus Disconnected: Body Control Module (BCM) Bus Disabled: Parking Assistance Module (PAM). Bus Disabled: Electronic Parking Brake (EPB) Module Bus Disabled: Dynamic Suspension Module	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U010087	Lost Communication with ECM/PCM "A"	No CAN Message to ECM/Transfer Case Control Module	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U010187	Lost connection with TCM	No CAN Message to TCM/Transfer Case Control Module	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U010486	Lost Communication with Cruise Control Module	Incorrect signal from TCCM ACC: Timeout, signal out of range, or invalid signal	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U010487	Lost Communication with Cruise Control Module	No CAN Message for Transfer Case Control Module/Cruise Control Module	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U012287	Lost Communication with Vehicle Dynamics Control Module	No CAN Message for Transfer Case Control Module/ABS Module	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U012687	Lost Communication with Steering Angle Sensor Module (SASIVI)	CAN bus failure SASM module is disconnected SASM module configuration not set/calibration not performed SASM malfunction	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U012887	Lost Communication With Parking Brake Control Module	CAN bus failure Parking brake module is disconnected Parking brake module configuration not set Parking brake module malfunction	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U013286	Lost Communication with Suspension Control Module "A"	Air suspension system: timeout, signal out of range or invalid signal	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U013287	Lost Communication with Suspension Control Module "A"	No CAN Message for Transfer Case Control Module/Air Suspension Control Module CAN bus failure RLM is disconnected RLM configuration is not configured RLM failure Problem with wiring harness/electrical connector	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U013687	Lost Communication with Rear Differential Control Module	No CAN Message for Transfer Case Control Module/Rear Differential Electronic Control Module CAN bus failure ATCM is disconnected ATCM module configuration is not set ATCM Malfunction Problem with wiring harness/electrical connector	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U013886	Lost Communication with Terrain Response System Control Module	No CAN Message for Transfer Case Control Module/Terrain Response Control Module CAN bus failure ATCM is disconnected ATCM module configuration is not set ATCM Malfunction Problem with wiring harness/electrical connector	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U015587	Lost Communication with Instrument Panel Control (IPC) Module	No CAN Message for Transfer Case/Instrument Cluster Control Module CAN bus failure IPC module is disconnected IPC module configuration is not configured IPC module failure Problem with wiring harness/electrical connector	Check the control module installation/configuration. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the Service Station Manual.
U030055	Internal control module software incompatibility	ATCM module configuration is not set	Configure the module using an approved diagnostic system.
U1A034A	Vehicle configuration parameters	Vehicle Configuration - Incorrect Module Installed	Configure the module using an approved diagnostic system.
U1A0387	Vehicle configuration parameters	Lost Communication with BCM/RCM - No Message Vehicle configuration data not received	Configure the module using an approved diagnostic system. Refer to the description of the communication loss condition at the beginning of the Network Communications section in the workshop manual.
U1A1449	CAN initialization failure	Internal electronic malfunction	Refer to the "Network Communication" section in the service station manual.
U1A354A	VIN data	VIN data mismatch Lost Communication with Front Differential Control Module - Incorrect Component Installed	Configure the module using an approved diagnostic system. Refer to the "Network Communication" section in the workshop manual.