P1AAC – BMW DTC

BMW DTC P1AAC – Electric/Auxiliary Transmission Fluid Pump Driver Low Voltage Supply Warning

DTC P1AAC meaning on BMW

DTC P1AAC on a BMW refers to the Electric/Auxiliary Transmission Fluid Pump Driver Low Voltage Supply Warning. This diagnostic trouble code indicates that the control module has detected a low voltage supply issue related to the electric or auxiliary transmission fluid pump driver.

BMW DTC P1AAC symptoms

Symptoms of DTC P1AAC on a BMW may include:

• Check Engine Light (MIL) illuminated
• Transmission shifting issues
• Reduced performance or drivability

BMW DTC P1AAC causes

Common causes of DTC P1AAC on a BMW include:

• Faulty electric or auxiliary transmission fluid pump driver
• Wiring or connection issues
• Low voltage supply from the battery or alternator

BMW DTC P1AAC seriousness

The seriousness of DTC P1AAC on a BMW depends on the underlying cause. Ignoring this fault code can lead to potential transmission problems and affect the overall drivability of the vehicle. It is recommended to address this issue promptly to prevent further damage.

How to diagnose DTC P1AAC on BMW

To diagnose DTC P1AAC on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s control module.
2. Inspect the electric and auxiliary transmission fluid pump driver for any visible damage or signs of malfunction.
3. Check the wiring and connections related to the pump driver for any loose connections or corrosion.
4. Test the voltage supply to the pump driver to ensure it is within the specified range.

How to fix DTC P1AAC on BMW

To fix DTC P1AAC on a BMW, you can try the following:

1. Replace the faulty electric or auxiliary transmission fluid pump driver.
2. Repair any damaged wiring or connections associated with the pump driver.
3. Ensure the battery and alternator are providing the correct voltage supply to the pump driver.
4. Clear the fault codes using a diagnostic scanner after the repairs have been completed.

How to erase DTC P1AAC on BMW

To erase DTC P1AAC on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the vehicle’s control module. Once the underlying issue has been addressed and fixed, you can reset the codes to turn off the Check Engine Light and ensure the system is operating properly.

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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