BMW DTC P31BC – Cylinder 12 H2-Injector High Side Shorted to Coil
DTC P31BC meaning on BMW
DTC P31BC for BMW indicates that there is a high side short circuit between the H2-injector and the coil in cylinder 12 of the engine. This fault code is specific to the fuel injector and ignition coil system for that particular cylinder.
BMW DTC P31BC symptoms
Symptoms of DTC P31BC on a BMW may include rough idling, misfires, loss of power, decreased fuel efficiency, and potentially an illuminated check engine light on the dashboard.
BMW DTC P31BC causes
The most common causes of DTC P31BC on a BMW are a short circuit between the H2-injector and the coil in cylinder 12, damaged wiring or connectors, or a faulty injector or coil in that specific cylinder.
BMW DTC P31BC seriousness
Ignoring DTC P31BC on a BMW can lead to further engine damage, reduced performance, and potential drivability issues. It is important to address this fault code promptly to prevent any long-term issues.
How to diagnose DTC P31BC on BMW
To diagnose DTC P31BC on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a visual inspection of the wiring and connectors related to the H2-injector and coil in cylinder 12. They may also conduct tests to check the functionality of the injector and coil.
How to fix DTC P31BC on BMW
Fixing DTC P31BC on a BMW may involve repairing or replacing any damaged wiring or connectors, as well as replacing the faulty injector or coil in cylinder 12. It is important to follow manufacturer guidelines and use quality replacement parts to ensure proper functionality.
How to erase DTC P31BC on BMW
Once the underlying issue causing DTC P31BC on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the check engine light and allow the vehicle’s onboard computer 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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