BMW DTC P31FE – Cylinder 11 High Pressure Injector Low Side Shorted to Coil
DTC P31FE meaning on BMW
The Diagnostic Trouble Code (DTC) P31FE for BMW indicates that there is a fault with the high-pressure injector in cylinder 11. Specifically, it suggests that the low side of the injector is shorted to the coil. This fault can lead to issues with fuel delivery and combustion in the affected cylinder.
BMW DTC P31FE symptoms
Symptoms of the BMW DTC P31FE may include rough idling, misfires, loss of power, decreased fuel efficiency, and potentially an illuminated check engine light on the dashboard. The vehicle may also exhibit poor acceleration and overall performance.
BMW DTC P31FE causes
The most common causes of the BMW DTC P31FE include a short circuit between the low side of the high-pressure injector and the coil in cylinder 11. This can be due to wiring issues, a faulty injector, or a problem with the engine control module (ECM).
BMW DTC P31FE seriousness
Ignoring the BMW DTC P31FE can lead to further engine damage, decreased fuel efficiency, and potential drivability issues. It is important to address this fault promptly to prevent more severe problems and ensure the vehicle operates correctly.
How to diagnose DTC P31FE on BMW
To diagnose the DTC P31FE 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 inspect the wiring harness, connectors, and the high-pressure injector in cylinder 11 for any visible damage or signs of a short circuit. Testing the injector’s resistance and checking for proper voltage supply can help pinpoint the issue.
How to fix DTC P31FE on BMW
Fixing the BMW DTC P31FE usually involves repairing the short circuit between the low side of the high-pressure injector and the coil in cylinder 11. This may require replacing damaged wiring, repairing connectors, or replacing the faulty injector. Ensuring proper connections and addressing any underlying issues that caused the fault is crucial to resolving the DTC P31FE.
How to erase DTC P31FE on BMW
Once the BMW DTC P31FE has been diagnosed and fixed, the fault code can be cleared using a diagnostic scanner. By accessing the ECM and selecting the option to clear fault codes, the DTC P31FE will be erased from the system. It is important to verify that the issue has been resolved before clearing the code to prevent it from reoccurring.
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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