BMW DTC P27A4 – Electric/Auxiliary Transmission Fluid Pump ‘B’ Control Circuit Low
DTC P27A4 meaning on BMW
The Diagnostic Trouble Code (DTC) P27A4 for BMW refers to the Electric/Auxiliary Transmission Fluid Pump ‘B’ Control Circuit Low. This code indicates that there is an issue with the control circuit of the electric or auxiliary transmission fluid pump ‘B’ in the vehicle.
BMW DTC P27A4 symptoms
Symptoms of the BMW DTC P27A4 may include:
- Transmission shifting issues
- Transmission slipping
- Transmission overheating
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P27A4 causes
Common causes of the BMW DTC P27A4 may include:
- Faulty electric or auxiliary transmission fluid pump ‘B’
- Wiring or connector issues in the control circuit
- Low transmission fluid level
- Internal transmission problems
BMW DTC P27A4 seriousness
The seriousness of the BMW DTC P27A4 code lies in the potential transmission issues it can cause. Ignoring this code can lead to further damage to the transmission system and potentially result in costly repairs if not addressed promptly.
How to diagnose DTC P27A4 on BMW
To diagnose the DTC P27A4 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the electric or auxiliary transmission fluid pump ‘B’ and its control circuit for any visible damage
- Check the transmission fluid level and condition
- Perform a thorough visual inspection of the wiring and connectors related to the pump
How to fix DTC P27A4 on BMW
To fix the DTC P27A4 on a BMW, the following steps may be taken:
- Replace the faulty electric or auxiliary transmission fluid pump ‘B’
- Repair or replace any damaged wiring or connectors in the control circuit
- Ensure the transmission fluid level is correct and top up if necessary
- Address any internal transmission issues if identified
How to erase DTC P27A4 on BMW
To erase the DTC P27A4 on a BMW, the fault codes can be cleared using a diagnostic scanner. After the necessary repairs have been made, the scanner can be used to reset the codes and clear the Check Engine Light from the dashboard.
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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