P2621 – BMW DTC

BMW DTC P2621 – Throttle Position Output Circuit Low

DTC P2621 meaning on BMW

The Diagnostic Trouble Code (DTC) P2621 for BMW indicates a fault in the throttle position output circuit. This code is triggered when the Engine Control Module (ECM) detects that the voltage signal from the throttle position sensor is lower than the expected range.

BMW DTC P2621 symptoms

Symptoms of DTC P2621 on a BMW may include:

• Check Engine Light (CEL) illuminated on the dashboard
• Reduced engine power or acceleration
• Engine stalling or rough idling
• Difficulty in shifting gears (for automatic transmissions)

BMW DTC P2621 causes

Common causes of DTC P2621 on a BMW include:

• Faulty throttle position sensor
• Corroded or damaged wiring in the throttle position sensor circuit
• Issues with the throttle body or its components
• ECM software or hardware problems

BMW DTC P2621 seriousness

DTC P2621 should not be ignored as it can lead to drivability issues and potential safety concerns. It is recommended to address this code promptly to prevent further damage to the vehicle and ensure optimal performance.

How to diagnose DTC P2621 on BMW

To diagnose DTC P2621 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the ECM.
2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion.
3. Check the throttle body for proper operation and cleanliness.
4. Perform a voltage test on the throttle position sensor to verify its output signal.
5. Consult the vehicle’s service manual for specific diagnostic procedures related to DTC P2621.

How to fix DTC P2621 on BMW

To fix DTC P2621 on a BMW, you can consider the following actions:

1. Replace the faulty throttle position sensor if it is determined to be the cause of the issue.
2. Repair or replace any damaged wiring in the throttle position sensor circuit.
3. Clean or replace the throttle body if necessary.
4. Update the ECM software if recommended by the manufacturer.
5. Perform a thorough inspection and testing to ensure the issue is resolved.

How to erase DTC P2621 on BMW

To erase DTC P2621 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 code, you can reset the codes to see if the problem has been resolved. It is important to verify that the issue has been fixed before clearing the codes to prevent recurring problems.

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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