P11DC
ModerateP11DC — NOx Sensor (Bank 1, Sensor 2): Implausible Signal
Description
What the Code Means
P11DC is a GM/Opel code that flags a current problem with the second NOx sensor (bank 1 sensor 2), mounted downstream of the exhaust aftertreatment system. The controller continuously monitors the current draw of the sensor and compares it against the expected range. A deviation means the sensor is sending an incorrect signal or its wiring circuit is faulty. The cause can be the NOx sensor itself or its wiring.
Symptoms
Symptoms
- Check Engine light is on.
- Reduced engine power.
Causes and fixes
Diagnosis and Repair
- Run diagnostics on the control module, read the codes and the NOx sensor parameters.
- Check the wiring and connectors of the NOx sensor circuit for opens, shorts, and corroded contacts.
- If the fault is confirmed, replace the NOx sensor.
Possible secondary damage
Secondary Problems
- Ignoring the fault can damage the catalytic converter.