Rear Differential Control Module (RDCM) fault code (Freelander 2)

Rear drive axle and differential

NOTE: If a module or component failure is suspected and the vehicle remains under manufacturer's warranty, refer to the Warranty Guide (Section B1.2) or determine if there is a previously approved special program in effect before replacing the component.

NOTE: Generic scan tools may not be able to read the codes listed or may only be able to 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 the manufacturer-approved diagnostic system).

NOTE: When performing voltage or resistance tests, always use a digital multimeter (DMM) with three decimal places of accuracy and a valid calibration certificate. When testing resistance, be sure to include the resistance of the DMM leads.

NOTE: Before starting diagnostic programs using fault location tests, check and correct basic faults.

NOTE: Inspect the connectors for signs of water ingress and their pins for damage and/or corrosion.

[The publication was copied from a web resource lrman.ru]

NOTE: If DTCs are set and the fault is not present after performing the troubleshooting tests, an intermittent problem may be the cause. Be sure to check for loose connections and corroded terminals.

Description and operation

For a detailed description of the rear differential system, refer to the relevant section "Description and Operation" of the workshop manual. For additional information, refer to the chapter: Rear Drive Axle and Differential (205-02 Rear Drive Axle/Differential, Description and Operation).

DTC	Description	Possible reason	Action
P0560-17	System Voltage: The voltage in the circuit is above the threshold value	Differential Electronic Module (DEM): Power Circuit Voltage Above Threshold	Check the battery and charging system and repair as necessary. Refer to the appropriate section of the repair manual. Refer to the electrical diagrams to check the power and ground circuits of the differential electronic module (DEM). Clear the DTCs and retest.
P0602-54	Powertrain Control Unit Programming Error: No Calibration	Differential Electronic Module (DEM) programming error. Internal fault in the differential electronic module (DEM).	Using the manufacturer approved diagnostic system, check and install the latest software in the differential electronic module (DEM). Clear the DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior authorization under any applicable special program.
P0607-49	Control unit operation: internal electronics failure	Internal Differential Electronic Module (DEM) Malfunction	Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0666-11	PCM/ECM/TCM Internal Temperature Sensor Circuit Short to Ground	Internal Differential Electronic Module (DEM) Malfunction	Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0666-15	PCM/ECM/TCM Internal Temperature Sensor Circuit: Short to Battery or Open Circuit	Internal Differential Electronic Module (DEM) Malfunction	Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0667-27	PCM/ECM/TCM Internal Temperature Sensor Range/Parameter: Rate of Change of Signal Above Threshold	Internal Differential Electronic Module (DEM) Malfunction	Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0748-14	Pressure control solenoid valve "A", electrical equipment: short circuit to ground or open circuit	Internal Differential Electronic Module (DEM) Malfunction	Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0748-1D	Pressure Control Solenoid "A" Circuit Current Out of Range	Internal Differential Electronic Module (DEM) Malfunction	Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0932-11	Hydraulic Pressure Sensor Circuit: Short to Ground	Internal oil pressure sensor connector faulty. Internal oil pressure sensor malfunction. Internal fault in the differential electronic module (DEM).	Remove the differential electronic module (DEM) and check the internal oil pressure sensor connection. Repair if necessary. Check and install a new internal pressure sensor if necessary. Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0932-15	Hydraulic pressure sensor circuit: short to battery or open circuit	Internal oil pressure sensor connector faulty. Internal oil pressure sensor malfunction. Internal fault in the differential electronic module (DEM).	Remove the differential electronic module (DEM) and check the internal oil pressure sensor connection. Repair if necessary. Check and install a new internal pressure sensor if necessary. Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0937-11	Hydraulic Fluid Temperature Sensor Circuit Short	Internal oil temperature sensor connector faulty. Internal oil temperature sensor malfunction. Internal fault in the differential electronic module (DEM).	Remove the differential electronic module (DEM) and check the internal oil temperature sensor connection. Repair if necessary. Check and install a new internal oil temperature sensor if necessary. Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0937-15	Hydraulic Oil Temperature Sensor Circuit: Short to Battery or Open Circuit	Internal oil temperature sensor connector faulty. Internal oil temperature sensor malfunction. Internal fault in the differential electronic module (DEM).	Remove the differential electronic module (DEM) and check the internal oil temperature sensor connection. Repair if necessary. Check and install a new internal oil temperature sensor if necessary. Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0938-27	Hydraulic Oil Temperature Sensor Circuit Range/Parameters: Signal Rate of Change Above Threshold	Internal oil temperature sensor connector faulty. Internal oil temperature sensor malfunction. Internal fault in the differential electronic module (DEM).	Remove the differential electronic module (DEM) and check the internal oil temperature sensor connection. Repair if necessary. Check and install a new internal oil temperature sensor if necessary. Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P0961-62	Pressure Regulating Solenoid "A" Control Circuit Range/Parameters: Signal Comparison Error	Internal fault in the differential electronic module (DEM). Differential clutch assembly failure.	Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program. Clear DTCs and retest. Inspect and install a new differential clutch assembly if necessary. Before installing a new unit/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P1889-12	High pressure oil pump operation: short circuit to battery	Short circuit in the high pressure oil pump power supply circuit. Internal failure of the high pressure oil pump. Internal fault in the differential electronic module (DEM).	Using the electrical diagrams, check the high pressure oil pump circuit for a short to power. Clear DTCs and retest. Check and install a new high pressure oil pump if necessary. Before installing a new unit/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program. Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P1889-14	High pressure oil pump operation: short circuit to ground or open circuit	Short circuit to ground, open circuit in high pressure oil pump circuit. Internal failure of the high pressure oil pump. Internal fault in the differential electronic module (DEM).	Using the electrical diagrams, check the high pressure oil pump circuit for a short to ground or an open circuit. Clear DTCs and retest. Check and install a new high pressure oil pump if necessary. Before installing a new unit/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program. Clear DTCs and retest. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P1889-49	High pressure oil pump operation: internal electronics failure	Internal failure of high pressure oil pump	Clear DTCs and retest. Check and install a new high pressure oil pump if necessary. Before installing a new unit/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P1889-74	High pressure oil pump operation: drive slippage	Short circuit of high pressure oil pump harness to ground/power supply circuit, open circuit. Internal failure of the high pressure oil pump. Differential clutch assembly failure	Using the electrical diagrams, check the high pressure oil pump harness for a short to ground/power or an open circuit. Clear DTCs and retest. Check and install a new high pressure oil pump if necessary. Before installing a new unit/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program. Clear DTCs and retest. Inspect and install a new differential clutch assembly if necessary. Before installing a new unit/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
P188A-68	Differential Oil Temperature Too High/Low: Event Information	Differential oil temperature too high. Internal oil temperature sensor connector faulty. Internal oil temperature sensor connector faulty. Internal fault in the differential electronic module (DEM). Differential clutch assembly failure.	Wait for the differential clutch to cool down. Take into account the ambient air temperature. Clear the DTCs and retest. Remove the differential electronic module (DEM) and check the internal oil temperature sensor connection. Repair if necessary. Check and install a new internal oil temperature sensor if necessary. Inspect and install a new Differential Electronic Module (DEM) if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior authorization under any applicable special program. Clear DTCs and retest. Inspect and install a new differential clutch assembly if necessary. Before installing a new unit/component, consult the warranty and procedures manual to determine if the replacement requires prior approval under any applicable special program.
U0001-00	High Speed CAN Bus: No subtype information available	High Speed CAN Communication Bus Circuit: Short to Ground/Power, Open Circuit	Perform a CAN network integrity test using the manufacturer approved diagnostic system. Refer to the electrical circuit diagrams to test the CAN network circuit for a short to ground/power or an open circuit.
U0100-00	No communication with engine control unit/powertrain control unit (ECM/PCM) "A": no subtype information	Lost Communication with Engine Control Module (ECM)	Refer to the electrical circuit diagrams and check the power and ground circuits of the engine control module (ECM). Perform a CAN network integrity check using the manufacturer approved diagnostic system. Refer to the electrical circuit diagrams and check the CAN network between the all terrain control module (ATCM) and the differential electronic module (DEM).
U0121-00	Lost Communication with Anti-lock Brake System (ABS) Control Unit: No Subtype Information	Lost communication with the anti-lock brake system (ABS) unit	Refer to the electrical circuit diagrams and check the power and ground circuits of the anti-lock brake system (ABS) module. Perform a CAN network integrity check using the manufacturer approved diagnostic system. Refer to the electrical circuit diagrams and check the CAN network between the all terrain control module (ATCM) and the differential electronic module (DEM).
U0138-00	No communication with All Terrain Cross-Country Mode Control Unit: No subtype information	Lost Communication with All Terrain Control Module (ATCM)	Refer to the electrical circuit diagrams and check the power and ground circuits of the All Terrain Control Module (ATCM). Perform a CAN network integrity check using the manufacturer approved diagnostic system. Refer to the electrical circuit diagrams and check the CAN network between the All Terrain Control Module (ATCM) and the Differential Electronic Module (DEM).
U0140-00	No communication with body control unit: no subtype information	Lost Communication with Central Junction Box (CJB)	Referring to the electrical circuit diagrams, check the power and ground circuits connected to the central junction box (CJB). Perform a CAN network integrity check using the manufacturer approved diagnostic system. Referring to the electrical circuit diagrams, check the CAN network between the central junction box (CJB) and the differential electronic module (DEM).
U0300-00	Internal control unit software incompatibility: no subtype information	High speed CAN communication bus circuit malfunction. An invalid configuration message was received.	Perform a CAN network integrity check using the manufacturer approved diagnostic system. Referring to the electrical circuit diagrams, check the CAN network to the differential electronic module (DEM). Refer to the electrical diagrams to check the module power and ground circuits. Perform a CAN network integrity check using the manufacturer approved diagnostic system. Using the electrical diagrams, check the CAN network between the central junction box (CJB) and the differential electronic module (DEM). Clear the DTCs and retest.
U0300-4A	Incompatible internal control unit software: Incompatible component installed	Differential Electronic Module (DEM): no calibration, software corrupted. The vehicle has an incorrect Differential Electronic Module (DEM).	Using the manufacturer approved diagnostic system, check and install the latest software in the differential electronic module (DEM). Clear the DTCs and retest. Ensure that the correct Differential Electronic Module (DEM) is installed in the vehicle. Check and install a new DEM if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior authorization under any applicable special program.
U0401-68	Invalid data received from engine control unit/powertrain control unit (ECM/PCM): event information	Incorrect data received	Check the engine control module (ECM) for DTCs and check their meaning in the DTC index. Clear the DTCs and retest.
U0415-00	Invalid data received from the anti-lock brake system (ABS) control unit: no subtype information	Invalid data received from the anti-lock brake system (ABS) module	Check the anti-lock brake system (ABS) module for DTCs related to the malfunction and refer to the appropriate DTC index. Clear the DTCs and recheck.
U0418-68	Invalid data received from brake control unit: event information	Invalid data received from the anti-lock brake system (ABS) module	Check the anti-lock brake system (ABS) module for DTCs related to the malfunction and refer to the appropriate DTC index. Clear the DTCs and recheck.
U2101-00	Incompatible control unit configuration: no subtype information	Invalid vehicle configuration file (CCF) data parameter	If necessary, check and update the vehicle configuration file (CCF) using the manufacturer approved diagnostic system. Clear the DTCs and retest.
U3002-81	Vehicle Identification Number: Invalid data received via serial communication channel	The vehicle has an incorrect Differential Electronic Module (DEM) installed	Ensure that the correct Differential Electronic Module (DEM) is installed in the vehicle. Check and install a new DEM if necessary. Before installing a new module/component, consult the warranty and procedures manual to determine if the replacement requires prior authorization under any applicable special program.
U3003-62	Battery Voltage: Signal Comparison Error	Battery voltage difference of 2 volts or more between central junction box (CJB) and differential electronic module (DEM)	Refer to the electrical diagrams to check the power and ground circuits of the differential electronic module (DEM). Using the electrical diagrams, check the power and ground circuits connected to the central junction box (CJB).