BMW DTC P31B6 – Cylinder 6 H2-Injector High Side Shorted to Coil
DTC P31B6 meaning on BMW
DTC P31B6 for BMW indicates that there is a high side short circuit between the H2-injector of cylinder 6 and the coil. This fault code is related to the fuel injection system of the vehicle.
BMW DTC P31B6 symptoms
Symptoms of DTC P31B6 on a BMW may include rough idling, misfiring, loss of power, decreased fuel efficiency, and potentially an illuminated check engine light on the dashboard.
BMW DTC P31B6 causes
The most common causes of DTC P31B6 on a BMW are a short circuit between the H2-injector and the coil in cylinder 6, damaged wiring or connectors in the fuel injection system, or a faulty injector or coil.
BMW DTC P31B6 seriousness
Ignoring DTC P31B6 on a BMW can lead to engine performance issues, potential damage to the catalytic converter, and increased emissions. It is recommended to address this fault code promptly to prevent further complications.
How to diagnose DTC P31B6 on BMW
To diagnose DTC P31B6 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 6. Additionally, testing the injector and coil for proper functionality may be necessary.
How to fix DTC P31B6 on BMW
Fixing DTC P31B6 on a BMW may involve repairing or replacing any damaged wiring or connectors, addressing the short circuit between the H2-injector and coil in cylinder 6, and replacing any faulty components such as the injector or coil. It is recommended to follow the manufacturer’s repair procedures and guidelines.
How to erase DTC P31B6 on BMW
Once the underlying issue causing DTC P31B6 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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