BMW DTC P1AC4 – Electric/Auxiliary Transmission Fluid Pump Driver Temperature Too High
DTC P1AC4 meaning on BMW
The DTC P1AC4 code on BMW vehicles indicates that the Electric/Auxiliary Transmission Fluid Pump Driver Temperature is Too High. This fault code is related to the temperature of the electric or auxiliary transmission fluid pump driver exceeding the specified limits set by the vehicle’s control module.
BMW DTC P1AC4 symptoms
Symptoms of the BMW DTC P1AC4 code may include:
- Check Engine Light (MIL) illuminated on the dashboard
- Transmission shifting issues
- Reduced performance or drivability
- Overheating of the transmission fluid
BMW DTC P1AC4 causes
The common causes of the BMW DTC P1AC4 code include:
- Overheating of the electric or auxiliary transmission fluid pump driver
- Electrical faults in the transmission fluid pump driver circuit
- Defective transmission fluid pump driver
- Issues with the transmission fluid pump driver temperature sensor
BMW DTC P1AC4 seriousness
The DTC P1AC4 code should be addressed promptly to prevent potential damage to the transmission system. Ignoring this fault can lead to further transmission issues, reduced drivability, and potential safety concerns while driving.
How to diagnose DTC P1AC4 on BMW
To diagnose the DTC P1AC4 code on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s control module
- Inspect the transmission fluid pump driver and its associated components for any visible damage or signs of overheating
- Check the electrical connections and wiring related to the transmission fluid pump driver
- Test the transmission fluid pump driver temperature sensor for proper operation
How to fix DTC P1AC4 on BMW
Depending on the root cause of the DTC P1AC4 code, the following steps may be taken to fix the issue:
- Replace the electric or auxiliary transmission fluid pump driver if it is found to be faulty
- Repair any damaged wiring or electrical connections in the transmission fluid pump driver circuit
- Address any issues with the transmission fluid pump driver temperature sensor
- Clear the fault codes and reset the vehicle’s control module after the repairs
How to erase DTC P1AC4 on BMW
To erase the DTC P1AC4 code on a BMW, the fault codes can be cleared using a diagnostic scanner or by disconnecting the vehicle’s battery for a few minutes. However, it is recommended to address the underlying issue causing the fault code before clearing it to prevent it from reoccurring.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.