BMW DTC P31F6 – Cylinder 3 High Pressure Injector Low Side Shorted to Coil
DTC P31F6 meaning on BMW
The DTC P31F6 on a BMW indicates that there is a fault with the Cylinder 3 High-Pressure Injector Low Side being shorted to the coil. This means that there is an electrical issue causing a short circuit between the injector and the coil in cylinder 3 of the engine.
BMW DTC P31F6 symptoms
Symptoms of the BMW DTC P31F6 may include rough idling, misfiring, loss of power, decreased fuel efficiency, and potentially an illuminated check engine light on the dashboard.
BMW DTC P31F6 causes
The most common causes of the BMW DTC P31F6 include wiring harness issues, a faulty injector, a faulty coil, or a problem with the Engine Control Module (ECM).
BMW DTC P31F6 seriousness
Ignoring the DTC P31F6 on a BMW can lead to engine performance issues, potential damage to the catalytic converter, and increased emissions. It is important to address this issue promptly to prevent further damage.
How to diagnose DTC P31F6 on BMW
To diagnose the DTC P31F6 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes and perform a visual inspection of the wiring harness, injector, and coil in cylinder 3. They may also perform electrical tests to pinpoint the exact cause of the short circuit.
How to fix DTC P31F6 on BMW
Fixing the DTC P31F6 on a BMW may involve repairing or replacing the wiring harness, injector, coil, or ECM, depending on the root cause of the issue. It is recommended to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P31F6 on BMW
Once the underlying issue causing the DTC P31F6 on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. This will erase the code from the ECM’s memory and turn off the check engine light.
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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