BMW DTC P1290 – Cold Start Turbocharger/Supercharger Wastegate ‘A’ Stop Not Learned
DTC P1290 meaning on BMW
DTC P1290 on a BMW indicates that the Cold Start Turbocharger/Supercharger Wastegate ‘A’ Stop has not been learned by the engine control module. This means that the system has not properly calibrated the wastegate stop position during cold start conditions.
BMW DTC P1290 symptoms
Symptoms of DTC P1290 on a BMW may include reduced engine performance, lack of power, poor acceleration, and potentially an illuminated check engine light on the dashboard.
BMW DTC P1290 causes
The most common causes of DTC P1290 on a BMW are a faulty wastegate actuator, wastegate position sensor, or a problem with the wastegate itself. It could also be triggered by a software issue in the engine control module.
BMW DTC P1290 seriousness
While DTC P1290 may not cause immediate harm to the vehicle, it can lead to reduced engine performance and efficiency. Ignoring this code could potentially cause further damage to the turbocharger system over time.
How to diagnose DTC P1290 on BMW
To diagnose DTC P1290 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the wastegate system components. They may also test the wastegate actuator and sensor for proper operation.
How to fix DTC P1290 on BMW
Fixing DTC P1290 on a BMW usually involves recalibrating the wastegate stop position using a diagnostic scanner or reprogramming the engine control module. If any components are found to be faulty during diagnosis, they should be replaced with new ones.
How to erase DTC P1290 on BMW
Once the underlying issue causing DTC P1290 on a BMW has been fixed, the fault code can be cleared using a diagnostic scanner. This will reset the check engine light and allow the system to monitor 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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