If you drive a GMC and have encountered the GMC P1351 Code, you may be feeling a bit overwhelmed. The GMC P1351 Code typically indicates an issue with the ignition control circuit, which can be caused by a variety of reasons. Fortunately, there are solutions to the issue, and understanding the causes and solutions of the GMC P1351 Code can help you get your vehicle back on the road.
Causes and Solutions to GMC P1351 Code
| Causes | Solutions |
|---|---|
| ICM control circuit is open, shorted to ground or shorted to B+ | Check power from ECM1 fuse |
| ICM is damaged or has failed | Replace ICM |
| PCM has failed | Replace PCM |
| System voltage over 4.90v | Check battery voltage |
Determining the Cause of GMC P1351 Code
The GMC P1351 Code is typically caused by a fault within the ignition control circuit. The ignition control circuit is responsible for controlling the spark produced by the ignition coil. If the circuit is open, shorted to ground, or shorted to B+, it can cause the GMC P1351 Code to be triggered. This can be due to a variety of issues, including a faulty ignition control module (ICM), a faulty powertrain control module (PCM), or a system voltage that is over 4.90 volts.
Checking Power from ECM1 Fuse
If the ICM control circuit is open, shorted to ground or shorted to B+, the first step to take is to check the power from the ECM1 fuse. This can be done by using a multimeter to measure the voltage. If the voltage is below 0.2v, the ECM fuse may need to be replaced.
Replacing the ICM or PCM
If the ECM1 fuse is not the problem, the ICM or PCM may need to be replaced. If the ICM is damaged or has failed, it must be replaced. The same is true if the PCM has failed. Replacing the ICM or PCM can be a complicated process and should be done by a qualified mechanic.
Checking Battery Voltage
The last step to take is to check the system voltage. If the system voltage is over 4.90 volts, the battery should be checked and replaced if necessary.
Conclusion
The GMC P1351 Code typically indicates an issue with the ignition control circuit. There are a variety of causes, from a faulty ignition control module to a faulty powertrain control module. Fortunately, there are solutions for the issue, including checking the power from the ECM1 fuse, replacing the ICM or PCM, and checking the battery voltage. By taking the necessary steps to address the GMC P1351 Code, you can get your vehicle back on the road and running smoothly.
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