When it comes to the GMC Code P1574, it can be a challenging issue to diagnose, as it is related to stopping lamp switch circuits and the EBCM’s ability to send the stop lamp switch signal to the PCM. This issue can cause DTCs P0502, P0503, P0719, P0724, P1575, and P1602 not to be set, and can prevent traction control and antilock brake systems from failing or being active. The cause of this GMC Code P1574 is usually a failed stop lamp switch signal to the EBCM or a failed EBCM’s ability to send the stop lamp switch signal to the PCM. While this can be a complex issue to resolve, there are a few solutions and factors to consider when attempting to troubleshoot and diagnose the GMC Code P1574.
Causes and Solutions for GMC Code P1574
| Causes | Solutions |
|---|---|
| Failed stop lamp switch signal to the EBCM | Check ABS/TCS DTCs for diagnosis of the stop lamp switch signal and the EBCM. |
| Failed EBCM’s ability to send the stop lamp switch signal to the PCM | Follow the related service bulletins for the GMC Code P1574 |
| DTC P1574 indicates the stop lamp switch signal to the EBCM has failed | Replace the stop lamp switch as necessary |
| Traction control and antilock brake systems have failed | Replace or reset the traction control and antilock brake systems |
Failed Stoplamp Switch Signal To The EBCM
When a failed stop lamp switch signal is sent to the EBCM, this can cause the GMC Code P1574. This type of failure can prevent traction control and antilock brake systems from becoming active or failing. To diagnose this issue, it is essential to check the ABS/TCS DTCs for any signs of a failed signal or EBCM.
Failed EBCM’s Ability To Send The Stop Lamp Switch Signal To The PCM
If the EBCM’s ability to send the stop lamp switch signal to the PCM has failed, this can be the cause of the GMC Code P1574. To resolve this issue, it is essential to follow the related service bulletins for the GMC Code P1574. This should provide some guidance on how to diagnose and troubleshoot the issue.
DTC P1574 Indicates The Stoplamp Switch Signal To The EBCM Has Failed
If the DTC P1574 is present, it is an indication that the stoplamp switch signal to the EBCM has failed. In this case, it is crucial to replace the stoplamp switch as necessary to resolve the issue.
Traction Control And Antilock Brake Systems Have Failed
When traction control and antilock brake systems have failed, this can be the cause of the GMC Code P1574. To resolve this issue, replacing or resetting the traction control and antilock brake systems is essential. This should then allow the GMC Code P1574 to be resolved.
Conclusion
The GMC Code P1574 can be a challenging issue to diagnose due to its connection with the stoplamp switch circuits and the EBCM’s ability to send the stoplamp switch signal to the PCM. While there are a few possible causes and solutions for the GMC Code P1574, it is essential to check the ABS/TCS DTCs for any signs of a failed signal or EBCM, follow the related service bulletins, and replace or reset the traction control and antilock brake systems as necessary.
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