BMW DTC P3120 – Cylinder 6 High Pressure Injector Low Side Circuit Open
DTC P3120 meaning on BMW
The DTC P3120 on a BMW indicates a fault with the Cylinder 6 High Pressure Injector Low Side Circuit Open. This means that there is an issue with the electrical circuit that controls the high-pressure fuel injector for cylinder 6 in the engine.
BMW DTC P3120 symptoms
Symptoms of the DTC P3120 on a BMW may include rough idling, misfiring, loss of power, poor fuel efficiency, and in some cases, the vehicle may go into limp mode. The Check Engine Light will also be illuminated on the dashboard.
BMW DTC P3120 causes
The most common causes of the DTC P3120 on a BMW include a faulty high-pressure fuel injector, wiring issues in the injector circuit, a bad injector driver in the Engine Control Module (ECM), or a poor connection in the injector circuit.
BMW DTC P3120 seriousness
The DTC P3120 should be taken seriously as it can lead to drivability issues and potential engine damage if left unresolved. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P3120 on BMW
To diagnose the DTC P3120 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then inspect the wiring and connections related to the Cylinder 6 high-pressure injector, perform a visual inspection for any visible damage, and conduct electrical tests to pinpoint the exact cause of the circuit open.
How to fix DTC P3120 on BMW
Fixing the DTC P3120 on a BMW may involve replacing the faulty high-pressure fuel injector, repairing any damaged wiring or connectors in the circuit, or replacing the injector driver in the ECM if necessary. It is crucial to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P3120 on BMW
Once the underlying issue causing the DTC P3120 on a BMW has been resolved, the fault codes can be cleared using a diagnostic scanner. This will reset the Check Engine Light and erase the DTC P3120 code from the ECM’s memory.
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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