BMW DTC P1A79 – Starter Generator Circuit High
DTC P1A79 meaning on BMW
The DTC P1A79 code on a BMW indicates an issue with the starter generator circuit being detected as having high voltage. This code is specific to vehicles equipped with a starter generator system, which combines the functions of a traditional starter motor and a generator into a single unit.
BMW DTC P1A79 symptoms
Symptoms of the DTC P1A79 code on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Vehicle may have difficulty starting
- Reduced power or performance
BMW DTC P1A79 causes
The DTC P1A79 code on a BMW can be triggered by various factors, including:
- Faulty starter generator
- Issues with the starter generator circuit wiring
- Faulty control modules
- Electrical system malfunctions
BMW DTC P1A79 seriousness
The seriousness of the DTC P1A79 code on a BMW depends on the underlying cause. Ignoring this code can lead to starting issues and potential drivability problems. It is recommended to address this code promptly to prevent further damage to the vehicle.
How to diagnose DTC P1A79 on BMW
When diagnosing the DTC P1A79 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the starter generator and its components for any visible damage
- Check the wiring and connectors in the starter generator circuit for loose connections or corrosion
- Test the control modules related to the starter generator system
How to fix DTC P1A79 on BMW
To fix the DTC P1A79 code on a BMW, the following steps may be taken:
- Repair or replace the faulty starter generator if necessary
- Repair any damaged wiring or connectors in the starter generator circuit
- Address any issues with the control modules by repairing or replacing them
- Clear the fault codes and test the vehicle to ensure the issue has been resolved
How to erase DTC P1A79 on BMW
To erase the DTC P1A79 code on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the vehicle’s system. After the repairs have been made and the issue resolved, the code can be cleared to reset the Check Engine Light and ensure that the problem has been addressed.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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