The GMC P11CB Code is a diagnostic trouble code (DTC) that can be generated when the engine control module (ECM) receives a serial data message from the NOx Sensor Module that the NOx concentration disagrees with the calculated NOx concentration for greater than 5 seconds. This code can indicate a wide range of issues from the NOx Sensor Module, the ECM, or even the exhaust system. It is important to accurately diagnose and repair the underlying cause of the P11CB Code to prevent further damage to your vehicle. To help you understand and fix the issue, in this article, we will discuss the definition, description, causes, and solutions of the GMC P11CB Code.
Causes and Solutions of the GMC P11CB Code
| Cause | Solution |
|---|---|
| P11CB or P11CC | Replace the NOx Sensor Module, the ECM, or the exhaust system depending on the diagnostic results. |
| The ECM receives a serial data message from the NOx Sensor Module that the NOx concentration disagrees with the calculated NOx concentration for greater than 5 s. | Check the wiring and connectors for any signs of corrosion or damage. |
| The DPF Regeneration is not active | Check the DPF regeneration cycle, the engine coolant temperature, the engine run time, and the engine speed. |
| The BARO is between 75-106 kPa (11-15 psi) | Check the pressure sensor for any signs of damage or problems. |
P11CB or P11CC
The potential causes of the P11CB or P11CC codes may include a faulty NOx Sensor Module, a faulty ECM, or a faulty exhaust system. To determine the root cause of the issue, it is important to diagnose and repair the underlying issue. To solve the issue, the NOx Sensor Module, the ECM, or the exhaust system may need to be replaced, depending on the diagnostic results.
The ECM Receives a Serial Data Message from the NOx Sensor Module
When the ECM receives a serial data message from the NOx Sensor Module that the NOx concentration disagrees with the calculated NOx concentration for greater than 5 seconds, the P11CB Code may be generated. To solve the issue, the wiring and connectors should be checked for any signs of corrosion or damage.
The DPF Regeneration is Not Active
If the DPF regeneration cycle is not active, the P11CB Code may be generated. To solve the issue, the DPF regeneration cycle, the engine coolant temperature, the engine run time, and the engine speed should be checked.
The BARO is Between 75-106 kPa (11-15 psi)
If the BARO is between 75-106 kPa (11-15 psi), the P11CB Code may be generated. To solve the issue, the pressure sensor should be checked for any signs of damage or problems.
Conclusion
In conclusion, the GMC P11CB Code is an indication of an issue that should be accurately diagnosed and repaired. The potential causes of the P11CB Code may include a faulty NOx Sensor Module, a faulty ECM, a faulty exhaust system, or a problem with the DPF regeneration cycle, the BARO, or the pressure sensor. To prevent further damage to your vehicle, it is important to understand and solve the issue using the solutions provided in this article. In this article, we discussed the causes and solutions of the GMC P11CB Code.
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