A proper diagnosis of a GMC code P018C is key to getting the right repair for your vehicle. This code is related to the fuel pressure sensor circuit, and it indicates a low voltage in the system. Determining the cause of this code can be a challenge due to the various factors that can contribute to it, such as the fuel pump control module, the fuel rail pressure sensor, and the fuel pump control state. Fortunately, there are a number of service bulletins available to aid in the diagnosis and repair of the issue. Understanding the possible causes and solutions can help you get your vehicle running again and prevent any further issues from developing.
Causes and Solutions for GMC Code P018C
| Cause | Solution |
|---|---|
| Fuel pump control module not detecting change in fuel rail pressure | Perform fuel pressure sensor performance diagnostic |
| DTC P018C, P018D, P0231, P0232, P023F, P064A, P1255 or P06A6 are active | Refer to service bulletin 21-NA-149 |
| DTC P0641 has failed this ignition cycle | Refer to service bulletin PIP5476 |
| Fuel pump control is disabled or fuel pump control state is abnormal | Refer to service bulletins PIT5677, PIT5677A, PIT5677B, PIT5677C, PIT5677E, PIT5713A, PIT5742, PIT5751A, PIT5751B, PIT5751C, and PIT5916 |
Fuel Pump Control Module Not Detecting Change in Fuel Rail Pressure
The fuel pump control module is responsible for detecting changes in the fuel rail pressure and sending a signal to the engine control module (ECM). If the fuel pump control module fails to detect a change in the fuel rail pressure, a code P018C may be set. To diagnose this issue, a fuel pressure sensor performance diagnostic must be performed.
DTC P018C, P018D, P0231, P0232, P023F, P064A, P1255, or P06A6 are Active
In some cases, a code P018C may be set if any of the following diagnostic trouble codes (DTC) are also present: P018D, P0231, P0232, P023F, P064A, P1255, or P06A6. If this is the case, service bulletin 21-NA-149 should be consulted for repair instructions.
DTC P0641 Has Failed This Ignition Cycle
In some instances, the DTC P0641 may have failed during the current ignition cycle, which can cause a code P018C to be set. In this case, service bulletin PIP5476 should be consulted for repair instructions.
Fuel Pump Control is Disabled or Fuel Pump Control State is Abnormal
If the fuel pump control is disabled or the fuel pump control state is abnormal, a code P018C may be set. In this case, the following service bulletins should be consulted: PIT5677, PIT5677A, PIT5677B, PIT5677C, PIT5677E, PIT5713A, PIT5742, PIT5751A, PIT5751B, PIT5751C, and PIT5916.
Conclusion
When diagnosing and repairing GMC Code P018C, it is important to understand the various causes and solutions for the issue. By consulting the service bulletins available, it is possible to troubleshoot and repair the issue, and get your vehicle running again. With proper diagnosis and repair, you can ensure that the GMC Code P018C is resolved and prevent any further issues from developing.
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