BMW DTC P157D – Throttle Valve Enable Line Circuit Low (Bank 2)
DTC P157D meaning on BMW
DTC P157D refers to the Throttle Valve Enable Line Circuit Low on Bank 2 in a BMW vehicle. This diagnostic trouble code indicates that there is a low voltage condition detected in the circuit responsible for enabling the throttle valve on Bank 2 of the engine.
BMW DTC P157D symptoms
Symptoms of DTC P157D in a BMW may include:
- Reduced engine performance
- Engine stalling
- Difficulty accelerating
- Illuminated Check Engine Light
BMW DTC P157D causes
Common causes of DTC P157D in a BMW include:
- Faulty throttle valve position sensor
- Wiring or connector issues in the throttle valve enable circuit
- Defective throttle valve actuator
- Electronic control module (ECM) failure
BMW DTC P157D seriousness
DTC P157D can lead to drivability issues and potential safety concerns if not addressed promptly. It is important to diagnose and repair this fault to ensure the proper functioning of the throttle system in the vehicle.
How to diagnose DTC P157D on BMW
To diagnose DTC P157D on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the throttle valve position sensor and its wiring for any visible damage
- Check the throttle valve actuator for proper operation
- Test the throttle valve enable circuit for continuity and voltage
- Inspect the ECM for any signs of malfunction
How to fix DTC P157D on BMW
To fix DTC P157D on a BMW, the following steps may be taken:
- Replace the faulty throttle valve position sensor
- Repair or replace any damaged wiring or connectors in the throttle valve enable circuit
- Replace the defective throttle valve actuator
- If necessary, replace the ECM with a new unit
How to erase DTC P157D on BMW
To erase DTC P157D on a BMW, a mechanic can use a diagnostic scanner to clear the fault code from the vehicle’s ECM memory. After the repair has been completed, the code can be erased to reset the Check Engine Light and ensure that the issue has been resolved.
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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