Description:

This diagnostic code indicates that the DEF (Diesel Exhaust Fluid) dosing injector circuit exhibits lower than normal resistance, suggesting a short to ground. Such a condition may cause excessive current flow, potentially damaging the injector or affecting its operational accuracy.

Reaction:

The ECU may disable the injector to prevent damage or may modify DEF dosing parameters to compensate for erratic injector behavior.

Recommendations:

• Inspect Injector Wiring: Check for any signs of insulation damage or exposed wires that could contact the vehicle’s frame or other grounded components.
• Measure Circuit Resistance: Use a multimeter to check the resistance in the circuit. Compare it to the manufacturer’s specifications to confirm if it is indeed too low.
• Repair Electrical Faults: Fix any shorts found during the inspection. This may involve replacing wires or connectors.
• Reset ECU and Test Injector Function: After repairs, reset the ECU to clear the diagnostic code and test the injector under various operational conditions to ensure it functions properly.

Note:

Maintaining proper electrical characteristics in the DEF dosing system is critical for accurate fluid dosing and effective emissions control. Regular electrical inspections are advisable to prevent malfunctions.