Description:

This error code indicates that the DEF (Diesel Exhaust Fluid) dosing injector signal is too high, typically due to a short to 12 volts. This fault can lead to incorrect operation of the DEF injector, potentially affecting the dosing process and thus the efficiency of emissions control.

Reaction:

The ECU may limit or modify the DEF injection process to prevent over-dosing, which could lead to system damage or inefficient exhaust aftertreatment.

Recommendations:

• Inspect Wiring and Connectors: Examine the electrical connections to the DEF dosing injector for signs of damage or wear that could cause a short to voltage.
• Measure Injector Voltage: Use a multimeter to confirm the high voltage condition at the injector’s electrical connector.
• Rectify Electrical Faults: Repair or replace any faulty wiring or connectors to ensure proper voltage delivery to the injector.
• Reset ECU and Test Injector Operation: After repairs, reset the ECU to clear the fault code and test the DEF dosing system under operational conditions to ensure correct function.

Note:

Maintaining proper electrical integrity in the DEF dosing system is crucial for emission control. Regular checks of the electrical system can prevent faults that compromise the DEF injection process.