BMW DTC P1591 – Throttle Valve 2 Potentiometer 1/2 Circuit High
DTC P1591 meaning on BMW
The Diagnostic Trouble Code (DTC) P1591 for BMW indicates an issue with the Throttle Valve 2 Potentiometer 1/2 Circuit being detected as high. This means that the signal voltage from the throttle valve potentiometer is higher than the expected range, signaling a potential problem with the throttle valve position sensor.
BMW DTC P1591 symptoms
Symptoms of DTC P1591 on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine power or acceleration
- Unresponsive throttle pedal
- Engine stalling or rough idling
BMW DTC P1591 causes
Common causes of DTC P1591 on a BMW include:
- Faulty throttle valve potentiometer
- Wiring or connector issues in the throttle valve circuit
- Electronic control module (ECM) malfunction
BMW DTC P1591 seriousness
DTC P1591 should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this fault may result in poor engine performance and could potentially lead to further damage if left unresolved.
How to diagnose DTC P1591 on BMW
To diagnose DTC P1591 on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and confirm the presence of P1591.
- Inspect the throttle valve potentiometer and its wiring for any visible damage or loose connections.
- Test the throttle valve potentiometer using a multimeter to check for proper voltage readings.
- Check the ECM for any stored codes or malfunctions related to the throttle valve circuit.
How to fix DTC P1591 on BMW
To fix DTC P1591 on a BMW, you can try the following solutions:
- Replace the faulty throttle valve potentiometer with a new one.
- Repair any damaged wiring or connectors in the throttle valve circuit.
- If the ECM is found to be faulty, consider reprogramming or replacing it as necessary.
How to erase DTC P1591 on BMW
To erase DTC P1591 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM. After addressing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and allow for a fresh monitoring of the system.
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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