Description:

This diagnostic trouble code is set when the DEF dosing injector signal falls too low, indicative of a short to ground. This malfunction can disrupt the normal operation of the DEF injector, potentially under-dosing the fluid and affecting NOx reduction.

Reaction:

The control system may alter DEF dosing or trigger warnings to indicate suboptimal dosing conditions, potentially leading to increased emissions.

Recommendations:

• Check Injector Wiring: Look for potential sources of grounding in the wiring to the DEF dosing injector that might cause the low signal.
• Test Electrical Output: Utilize a multimeter to verify low signal levels and identify the exact point of the short.
• Repair Electrical Issues: Fix any identified shorts to ground, and replace damaged wires or connectors.
• Reset ECU and Confirm Correct Operation: After making the necessary electrical repairs, reset the ECU to remove the error state and conduct tests to ensure the DEF dosing system functions properly.

Note:

Accurate signaling is essential for precise DEF dosing. Ensuring the electrical circuit’s integrity helps maintain compliance with emissions standards and overall engine performance.