BMW DTC P3172 – Cylinder 9 High Pressure Injector High Side Shorted to Coil
DTC P3172 meaning on BMW
DTC P3172 on a BMW indicates that there is a high-pressure injector high side shorted to the coil in cylinder 9. This means that there is an electrical issue causing a short circuit between the high-pressure injector and the coil in the ninth cylinder of the engine.
BMW DTC P3172 symptoms
Symptoms of DTC P3172 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 P3172 causes
The most common causes of DTC P3172 on a BMW include a faulty high-pressure injector, a short circuit in the wiring harness between the injector and the coil, or a malfunctioning engine control module (ECM).
BMW DTC P3172 seriousness
DTC P3172 should be taken seriously as it can lead to engine performance issues and potential damage if left unresolved. Ignoring this fault code may result in further engine problems and increased repair costs.
How to diagnose DTC P3172 on BMW
To diagnose DTC P3172 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 harness, high-pressure injector, and coil in cylinder 9. They may also conduct electrical tests to pinpoint the exact source of the short circuit.
How to fix DTC P3172 on BMW
Fixing DTC P3172 on a BMW usually involves replacing the faulty high-pressure injector, repairing any damaged wiring, or replacing the engine control module if necessary. Once the root cause of the short circuit is addressed, the fault code should be cleared, and the vehicle should be tested to ensure the issue is resolved.
How to erase DTC P3172 on BMW
To erase DTC P3172 on a BMW, a mechanic can use a diagnostic scanner to clear the fault code from the engine control module’s memory. After the repair has been completed and the fault code erased, the vehicle should be driven to ensure that the check engine light does not reappear.
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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