BMW DTC P31E1 – H2 and High Pressure Injector ECM Supply Voltage High (Bank 2)
DTC P31E1 meaning on BMW
DTC P31E1 for BMW refers to ¨High Pressure Injector ECM Supply Voltage High (Bank 2).¨ This diagnostic trouble code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the supply voltage circuit for the high-pressure fuel injector in Bank 2 of the engine.
BMW DTC P31E1 symptoms
Symptoms of DTC P31E1 in a BMW may include:
- Check Engine Light illuminated on the dashboard
- Engine running rough or misfiring
- Reduced engine performance
- Increased fuel consumption
BMW DTC P31E1 causes
Common causes of DTC P31E1 in a BMW include:
- Faulty high-pressure fuel injector in Bank 2
- Short circuit or open circuit in the injector supply voltage wiring
- Faulty Engine Control Module (ECM)
- Intermittent electrical connection issues
BMW DTC P31E1 seriousness
DTC P31E1 should be addressed promptly as it can lead to engine performance issues and potential damage if left unresolved. Ignoring this fault may result in poor fuel economy, rough running engine, and potential engine damage over time.
How to diagnose DTC P31E1 on BMW
To diagnose DTC P31E1 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the wiring harness and connectors for any visible damage or corrosion
- Test the high-pressure fuel injector in Bank 2 for proper operation
- Check the supply voltage to the injector using a multimeter
- Perform a continuity test on the wiring to check for any open circuits
How to fix DTC P31E1 on BMW
To fix DTC P31E1 on a BMW, the following steps may be taken:
- Replace the faulty high-pressure fuel injector in Bank 2
- Repair any damaged wiring or connectors in the supply voltage circuit
- If the ECM is found to be faulty, replace it with a new one
- Clear the fault codes and perform a test drive to ensure the issue has been resolved
How to erase DTC P31E1 on BMW
To erase DTC P31E1 on a BMW, follow these steps:
- Use a diagnostic scanner to clear the fault codes stored in the ECM
- Perform a test drive to ensure the Check Engine Light does not reappear
- If the fault code returns, further diagnosis and repairs may be necessary
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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