BMW DTC P0639 – Throttle Actuator Control Range/Performance (Bank 2)
DTC P0639 meaning on BMW
The Diagnostic Trouble Code (DTC) P0639 for BMW refers to an issue with the Throttle Actuator Control Range/Performance in Bank 2. This means that the Engine Control Module (ECM) has detected that the actual position of the throttle actuator does not match the expected position based on the input signals received.
BMW DTC P0639 symptoms
Symptoms of DTC P0639 on a BMW may include:
- Reduced engine power
- Engine stalling or hesitation
- Check Engine Light (CEL) illuminated on the dashboard
- Difficulty accelerating
BMW DTC P0639 causes
The common causes of DTC P0639 on a BMW include:
- Throttle actuator malfunction
- Wiring or connector issues in the throttle actuator circuit
- Faulty Engine Control Module (ECM)
- Throttle position sensor failure
BMW DTC P0639 seriousness
DTC P0639 should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this fault may result in further damage to engine components and could leave the vehicle inoperable.
How to diagnose DTC P0639 on BMW
To diagnose DTC P0639 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ECM
- Inspect the throttle actuator and related wiring for any visible damage or corrosion
- Test the throttle position sensor for proper operation
- Check the ECM for any signs of malfunction
How to fix DTC P0639 on BMW
To fix DTC P0639 on a BMW, the following steps may be taken:
- Repair or replace the throttle actuator if it is found to be faulty
- Repair any damaged wiring or connectors in the throttle actuator circuit
- Replace the throttle position sensor if it is determined to be the cause of the issue
- If the ECM is faulty, it may need to be reprogrammed or replaced
How to erase DTC P0639 on BMW
After the issue causing DTC P0639 on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and allow the vehicle’s ECM to monitor the system for any new faults.
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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