BMW DTC P1AA8 – Electric/Auxiliary Transmission Fluid Pump Driver Circuit High
DTC P1AA8 meaning on BMW
The DTC P1AA8 code on BMW vehicles indicates an issue with the Electric/Auxiliary Transmission Fluid Pump Driver Circuit being detected as high. This means that the control module has detected a higher than expected voltage in the circuit that controls the electric or auxiliary transmission fluid pump.
BMW DTC P1AA8 symptoms
Symptoms of the DTC P1AA8 code on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Transmission shifting issues
- Reduced fuel efficiency
- Vehicle going into limp mode
BMW DTC P1AA8 causes
The common causes of the DTC P1AA8 code on BMW vehicles include:
- Faulty electric or auxiliary transmission fluid pump
- Short circuit or open circuit in the pump driver circuit
- Wiring issues or poor connections
- Defective control module
BMW DTC P1AA8 seriousness
The DTC P1AA8 code should be addressed promptly as it can lead to transmission problems and potentially cause further damage if left unresolved. Ignoring this issue may result in more costly repairs down the line and could affect the drivability of the vehicle.
How to diagnose DTC P1AA8 on BMW
To diagnose the DTC P1AA8 code on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the electric or auxiliary transmission fluid pump and its wiring for any visible damage
- Check the pump driver circuit for continuity and proper voltage levels
- Test the control module for any faults
How to fix DTC P1AA8 on BMW
To fix the DTC P1AA8 code on a BMW, the following steps may be taken:
- Replace the faulty electric or auxiliary transmission fluid pump
- Repair any damaged wiring or connections in the pump driver circuit
- Reset the fault codes and test drive the vehicle to ensure the issue has been resolved
How to erase DTC P1AA8 on BMW
To erase the DTC P1AA8 code on a BMW, the fault codes can be cleared using a diagnostic scanner. After the repairs have been made and the issue resolved, the codes can be reset to turn off the Check Engine Light and ensure that the vehicle 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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