BMW DTC P27A5 – Electric/Auxiliary Transmission Fluid Pump ‘B’ Control Circuit High
DTC P27A5 meaning on BMW
DTC P27A5 in a BMW indicates an issue with the Electric/Auxiliary Transmission Fluid Pump ‘B’ Control Circuit being detected as high. This means that the control module has detected a higher than normal voltage in the circuit controlling the auxiliary transmission fluid pump ‘B’.
BMW DTC P27A5 symptoms
Symptoms of DTC P27A5 in a BMW may include:
- Check Engine Light illuminated on the dashboard
- Transmission shifting issues
- Reduced fuel efficiency
- Transmission overheating
BMW DTC P27A5 causes
Common causes of DTC P27A5 in a BMW include:
- Faulty electric/auxiliary transmission fluid pump ‘B’
- Short circuit or open circuit in the control circuit
- Corroded or damaged wiring/connectors in the circuit
- Defective transmission control module
BMW DTC P27A5 seriousness
Ignoring DTC P27A5 in a BMW can lead to potential transmission damage and drivability issues. It is important to address this fault promptly to prevent further damage to the transmission system.
How to diagnose DTC P27A5 on BMW
To diagnose DTC P27A5 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the electric/auxiliary transmission fluid pump ‘B’ and its control circuit for any visible damage
- Check the wiring and connectors for corrosion or damage
- Test the voltage and continuity in the control circuit
- Inspect the transmission control module for any signs of malfunction
How to fix DTC P27A5 on BMW
To fix DTC P27A5 on a BMW, you can try the following:
- Replace the faulty electric/auxiliary transmission fluid pump ‘B’
- Repair any short circuits or open circuits in the control circuit
- Repair or replace any corroded or damaged wiring/connectors
- If necessary, replace the transmission control module
How to erase DTC P27A5 on BMW
To erase DTC P27A5 on a BMW, you can use a diagnostic scanner to clear the fault code after the underlying issue has been resolved. Once the repair has been completed, you can erase the code to reset the Check Engine Light and ensure the fault does not reoccur.
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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