BMW DTC P126B – Turbocharger/Supercharger Wastegate ‘A’ Shorted
DTC P126B meaning on BMW
DTC P126B indicates that there is a short circuit in the wastegate ‘A’ of the turbocharger or supercharger system in a BMW vehicle. The wastegate is responsible for controlling the boost pressure in the turbocharger, and a short circuit can disrupt its operation.
BMW DTC P126B symptoms
Some common symptoms of DTC P126B in a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine power
- Possible turbocharger or supercharger performance issues
BMW DTC P126B causes
The potential causes of DTC P126B in a BMW can include:
- Short circuit in the wastegate ‘A’ wiring
- Faulty wastegate actuator
- Issues with the wastegate solenoid
BMW DTC P126B seriousness
DTC P126B should be addressed promptly as it can lead to reduced engine performance and potential long-term damage to the turbocharger or supercharger system in the BMW vehicle. Ignoring this fault may result in further complications and increased repair costs.
How to diagnose DTC P126B on BMW
To diagnose DTC P126B on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the wastegate ‘A’ wiring for any signs of damage or short circuits
- Test the wastegate actuator and solenoid for proper operation
How to fix DTC P126B on BMW
To fix DTC P126B on a BMW, the following steps may be taken:
- Repair or replace any damaged wiring in the wastegate ‘A’ circuit
- Replace the wastegate actuator if it is found to be faulty
- Check and replace the wastegate solenoid if necessary
How to erase DTC P126B on BMW
After the necessary repairs have been made to address DTC P126B on a BMW, the fault code can be erased using a diagnostic scanner. This will reset the Check Engine Light and clear the code from the vehicle’s memory.
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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