BMW DTC P31FF – Cylinder 12 High Pressure Injector Low Side Shorted to Coil
DTC P31FF meaning on BMW
The DTC P31FF error code on a BMW indicates that there is a fault with the high-pressure injector in cylinder 12. Specifically, it suggests that the low side of the injector is shorted to the coil, causing a malfunction in the fuel injection system.
BMW DTC P31FF symptoms
Symptoms of the BMW DTC P31FF code may include rough idling, misfires, decreased engine performance, reduced fuel efficiency, and potentially even stalling of the vehicle. The Check Engine Light may also be illuminated on the dashboard.
BMW DTC P31FF causes
The most common causes of the BMW DTC P31FF code are a short circuit between the high-pressure injector and the coil, a faulty injector, wiring issues, or a problem with the engine control module (ECM).
BMW DTC P31FF seriousness
Ignoring the DTC P31FF code on a BMW can lead to further engine damage, reduced fuel efficiency, and potential drivability issues. It is important to address this issue promptly to prevent any long-term damage to the vehicle.
How to diagnose DTC P31FF on BMW
To diagnose the DTC P31FF code on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s ECM. They would then perform a visual inspection of the injector and wiring harness to check for any visible damage. Additionally, testing the injector’s resistance and checking the wiring for continuity can help pinpoint the issue.
How to fix DTC P31FF on BMW
Fixing the DTC P31FF code on a BMW may involve replacing the faulty high-pressure injector in cylinder 12, repairing any damaged wiring, or addressing any issues with the engine control module. It is recommended to follow the manufacturer’s repair procedures and use genuine parts to ensure a proper fix.
How to erase DTC P31FF on BMW
Once the underlying issue causing the DTC P31FF code on a BMW has been resolved, the code can be cleared using a diagnostic scanner. By accessing the ECM and selecting the option to clear fault codes, the DTC P31FF code will be erased from the system, and the Check Engine Light should turn off.
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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