BMW DTC P31E2 – H2 and High Pressure Injector ECM Supply Voltage Low (Bank 1)
DTC P31E2 meaning on BMW
DTC P31E2 on a BMW refers to the High Pressure Injector ECM Supply Voltage Low fault detected in Bank 1. This diagnostic trouble code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the high-pressure fuel injector circuit of Bank 1.
BMW DTC P31E2 symptoms
Symptoms of the DTC P31E2 in a BMW may include rough idling, engine misfires, reduced engine performance, hesitation during acceleration, and in some cases, the vehicle may go into a limp mode where power is limited.
BMW DTC P31E2 causes
The common causes of the DTC P31E2 in a BMW include a faulty high-pressure fuel injector, wiring issues in the injector circuit, a defective Engine Control Module (ECM), or a poor connection in the injector harness.
BMW DTC P31E2 seriousness
The DTC P31E2 in a BMW should be addressed promptly as it can lead to drivability issues and potential engine damage if left unresolved. Ignoring this fault may result in poor engine performance and increased fuel consumption.
How to diagnose DTC P31E2 on BMW
To diagnose the DTC P31E2 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes and perform a thorough inspection of the high-pressure injector circuit in Bank 1. This may involve checking the wiring, connectors, and the high-pressure injector itself for any faults.
How to fix DTC P31E2 on BMW
Fixing the DTC P31E2 on a BMW may involve replacing the faulty high-pressure fuel injector, repairing any damaged wiring or connectors in the circuit, or reprogramming the Engine Control Module (ECM) if necessary. It is recommended to follow the manufacturer’s diagnostic and repair procedures to address this fault effectively.
How to erase DTC P31E2 on BMW
Once the underlying issue causing the DTC P31E2 in a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. By clearing the fault code, the Check Engine Light will turn off, indicating that the issue has been addressed successfully.
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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