BMW DTC P12C3 – Turbocharger/Supercharger Wastegate ‘B’ Position Sensor Supply Voltage Circuit Low
DTC P12C3 meaning on BMW
DTC P12C3 is a diagnostic trouble code that indicates an issue with the Turbocharger/Supercharger Wastegate ‘B’ Position Sensor Supply Voltage Circuit being too low in a BMW vehicle.
BMW DTC P12C3 symptoms
Symptoms of DTC P12C3 in a BMW may include reduced engine performance, decreased fuel efficiency, hesitation or surging during acceleration, and the illumination of the check engine light on the dashboard.
BMW DTC P12C3 causes
The causes of DTC P12C3 in a BMW can vary and may include a faulty wastegate ‘B’ position sensor, damaged wiring or connectors in the sensor circuit, a malfunctioning wastegate actuator, or issues with the power supply to the sensor.
BMW DTC P12C3 seriousness
While DTC P12C3 may not cause immediate harm to the vehicle, it can lead to reduced engine performance and fuel efficiency if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P12C3 on BMW
To diagnose DTC P12C3 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer system. They would then inspect the wastegate ‘B’ position sensor, check the wiring and connectors for any damage, and test the sensor’s voltage supply to determine the root cause of the issue.
How to fix DTC P12C3 on BMW
Fixing DTC P12C3 on a BMW may involve replacing the wastegate ‘B’ position sensor if it is found to be faulty, repairing any damaged wiring or connectors in the sensor circuit, or addressing issues with the power supply to the sensor. It is recommended to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P12C3 on BMW
Once the underlying issue causing DTC P12C3 has been resolved, the diagnostic trouble code can be cleared from the vehicle’s computer system using a diagnostic scanner. This will turn off the check engine light and reset the system for normal operation.
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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