| Sign of malfunction | Possible reason | Operation |
| Engine not starting | ||
| The crankshaft does not turn | Make sure the security system is disabled. Make sure the battery is fully charged and serviceable. Check for DTCs and refer to the appropriate DTC Index. Check the park/neutral switches and brake/clutch switches. Follow the correct starting procedure. Make sure the engine is not seized | |
| The engine turns over but does not start | Check for fuel contamination. Check engine breather and air intake system integrity. Follow proper starting procedure. Check for DTCs and refer to the appropriate DTC Index. | |
| Difficulty starting | ||
| Difficulty starting at cold start | Check the fuel coolant level/ condition. Make sure that the battery is fully charged and usable. Check for DTC codes and refer to the corresponding DTC Code Index | |
| Difficulty with hot start | Check for DTCs and refer to the appropriate DTC Index. Check the integrity of the engine, fuel, air intake, and exhaust systems | |
| Difficulty starting after hot soak (vehicle is stationary, with engine off, after engine has reached operating temperature) | Check the fuel system and engine management system for DTCs and refer to the appropriate DTC Index | |
| Engine cranks too fast/slowly | Make sure the battery is fully charged and serviceable. Check the engine compression. Check the integrity of the starting system | |
| General characteristics of vehicle handling | ||
| Rough idle operation | Check fuel level/condition. Check for DTCs and refer to the appropriate DTC Index. Check the integrity of the fuel system, air intake system and engine management system. | |
| High, low, unstable engine idle speed | Check for DTCs and refer to the appropriate DTC Index. Check the integrity of the air intake system, turbocharger and engine management system. | |
| Loss of power when accelerating | Check for fuel contamination. Check for DTCs and refer to the appropriate DTC Index. Check the integrity of the air intake system, exhaust system, turbocharger and engine management system. | |
| Engine stops/stalls | Check for fuel contamination. Check for DTCs and refer to the appropriate DTC Index. Check the integrity of the fuel system, air intake system, and engine management system. | |
| Diesel Particulate Filter (DPF) Warning Messages | ||
| "DPF Full Visit Dealer" message is displayed. Torque loss, regeneration inhibited (DTC P200200 is also logged) | The amount of soot in the filter is greater than the maximum threshold value | CAUTION: Before attempting dynamic regeneration, all leaks in the air intake system MUST be repaired.Check for any DTCs related to this problem and repair as necessary. Check the air intake system for proper installation and integrity and repair as necessary. Perform a dynamic regeneration using the manufacturer's approved diagnostic system |
| The message "Reduced Engine Performance" is displayed. The general characteristics of the car's handling do not change. Regeneration is reduced to the lower level (2) (DTC P054516 is also registered) | The voltage in the electrical circuit of the temperature sensor before the catalytic converter is below the threshold value | Refer to the electrical manuals and check the pre-catalytic converter temperature sensor circuit for a short to ground or open circuit |
| "Reduced Engine Performance" message is displayed. Overall vehicle handling is not affected (DTC P222700 is also set) | The atmospheric pressure sensor is faulty | Clear the DTC, start the engine and run it for 2 minutes, turn the ignition off (power off), start the engine and run it for another 2 minutes, turn the ignition off (power off), turn the ignition on and read the DTCs. If the DTC remains, refer to the new module/component installation note at the top of the DTC Index. |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P244A16) | The differential pressure of the flue gas filter is below the limit value | Clear DTC, cycle ignition on/off at least 6 times, turn ignition on, if DTC remains, install new differential pressure sensor |
| "DPF Full Visit Dealer" message is displayed. Torque loss, regeneration inhibited (DTC P244B68 is also logged) | High differential pressure of the exhaust gas filter - engine protection activated | CAUTION: Before attempting dynamic regeneration, all leaks in the air intake system MUST be repaired.Check differential pressure sensor hoses for proper installation and integrity, repair if necessary. Check air intake system for proper installation and integrity, repair if necessary. Perform dynamic regeneration using manufacturer approved diagnostic system |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P244C00) | Refer to the electrical diagrams and check the downstream catalytic converter temperature sensor circuit for an open. Install a new temperature sensor if necessary | |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P244D00) | Refer to the electrical diagrams and check the downstream catalytic converter temperature sensor circuit for a short to battery voltage. Install a new temperature sensor if necessary | |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Regeneration block (also registered by DTC P245300) | Corrected differential pressure of the flue gas filter at standstill is below minimum | Crossing differential pressure sensor hoses |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P245500) | Refer to the electrical diagrams and check the electrical circuit of the differential pressure sensor for a short to +battery. Install a new sensor if necessary | |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P245600) | Check differential pressure sensor hoses for cracks/deterioration, blockage. Refer to electrical diagrams and check differential pressure sensor circuits for short circuit, open circuit. Install new sensor if necessary | |
| "Oil Service required" message is displayed (DTC P250F00 is also displayed) | Engine oil contamination | Check the condition of the engine oil, replace if necessary |
| "Oil Service required" message is displayed (DTC P252F00 is also displayed) | Engine oil contamination | Check the condition of the engine oil, replace if necessary |
| "Oil Service required" message is displayed (DTC P253F00 is also displayed) | Engine oil contamination | Check the condition of the engine oil, replace if necessary |
| The message "Reduced Engine Performance" is displayed. The overall handling characteristic of the vehicle does not change, regeneration is reduced to the lower level (2) (DTC P208000 is also registered) | Exhaust Gas Temperature Sensor 1 Validity Violation | Refer to the electrical diagrams and check the upstream catalytic converter temperature sensor circuit for a short, open |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Regeneration block (also registered by DTC P244A00) | Signal invalid. Differential pressure sensor hose fault | Check the correct installation and integrity of the differential pressure sensor hoses, repair if necessary |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P244B22) | Signal amplitude is above maximum value. Uncorrected value of differential pressure of exhaust gas filter is above limit value after engine running | CAUTION: Before attempting dynamic regeneration, all leaks in the air intake system MUST be repaired.Check differential pressure sensor hoses for proper installation and integrity, repair if necessary. Check air intake system for proper installation and integrity, repair if necessary. Perform dynamic regeneration using manufacturer approved diagnostic system |
| "DPF Full" message is displayed with the reference icon (DTC P245200 is also logged) | Poor handling characteristics, no regeneration possible | Advise the driver to consult the manual |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P245400) | Refer to the electrical diagrams and check the electrical circuit of the differential pressure sensor for short circuit, open circuit. If necessary, install a new sensor | |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Torque drop, regeneration lockout (also registered by DTC P208400) | Exhaust Gas Temperature Sensor 2 Validity Violation | Refer to the electrical diagrams and check the downstream catalytic converter temperature sensor circuit for a short, open |
| The message "Reduced Engine Performance" is displayed. The overall handling characteristic of the vehicle does not change, regeneration is reduced to the lower level (2) (also registered DTC P054617) | The voltage in the electrical circuit of the temperature sensor before the catalytic converter is above the threshold value | Refer to the electrical diagrams and check the pre-catalytic converter temperature sensor circuit for a short to battery voltage |
| The message "Reduced Engine Performance" or "Engine System Fault" is displayed. Regeneration block (also registered by DTC P244A00) | Signal invalid. Differential pressure sensor hose fault | Check the correct installation and integrity of the differential pressure sensor hoses, repair if necessary |
| The message "Reduced Engine Performance" is displayed. The overall handling characteristic of the vehicle does not change, regeneration is reduced to the lower level (2) (DTC P244B22 is also registered) | Signal amplitude is above maximum value. Uncorrected value of differential pressure of exhaust gas filter is above limit value after engine running | CAUTION: Before attempting dynamic regeneration, all leaks in the air intake system MUST be repaired.Check differential pressure sensor hoses for proper installation and integrity, repair if necessary. Check air intake system for proper installation and integrity, repair if necessary. Perform dynamic regeneration using manufacturer approved diagnostic system |
| "DPF Full Visit Dealer" message is displayed. Torque loss, regeneration inhibited (DTC P244A97 is also logged) | The differential pressure sensor of the exhaust gas filter is blocked | Check the differential pressure sensor and hoses for blockages/restrictions |
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