BMW DTC P0091 – Fuel Pressure Regulator 1 Control Circuit Low
DTC P0091 meaning on BMW
DTC P0091 for BMW indicates a low voltage condition in the fuel pressure regulator 1 control circuit. This fault code is triggered when the engine control module (ECM) detects that the signal voltage from the fuel pressure regulator is below the expected range.
BMW DTC P0091 symptoms
Symptoms of DTC P0091 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Engine running rough or misfiring
- Decreased fuel efficiency
- Engine stalling or hesitation
BMW DTC P0091 causes
The common causes of DTC P0091 on a BMW are:
- Malfunctioning fuel pressure regulator
- Wiring or connector issues in the fuel pressure regulator circuit
- Faulty ECM
BMW DTC P0091 seriousness
DTC P0091 should be addressed promptly as it can lead to drivability issues and potential damage to the engine if left unresolved. Ignoring this fault code may result in poor engine performance and increased fuel consumption.
How to diagnose DTC P0091 on BMW
To diagnose DTC P0091 on a BMW, follow these steps:
- Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
- Inspect the wiring and connectors in the fuel pressure regulator circuit for any damage or corrosion.
- Test the fuel pressure regulator for proper operation using a multimeter.
- Check the fuel pressure readings to ensure they are within the manufacturer’s specifications.
How to fix DTC P0091 on BMW
To fix DTC P0091 on a BMW, you can:
- Replace the faulty fuel pressure regulator if it is determined to be the cause of the issue.
- Repair any damaged wiring or connectors in the fuel pressure regulator circuit.
- If the ECM is faulty, it may need to be reprogrammed or replaced.
How to erase DTC P0091 on BMW
To erase DTC P0091 on a BMW:
- Use a diagnostic scanner to clear the fault codes stored in the ECM.
- After making the necessary repairs, drive the vehicle to see if the Check Engine Light re-illuminates.
- If the issue has been resolved, the fault code should not reappear, indicating successful erasure of DTC P0091.
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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