P20AC – BMW DTC

BMW DTC P20AC – Reductant Metering Unit Temperature Sensor Circuit

DTC P20AC meaning on BMW

DTC P20AC on a BMW indicates an issue with the Reductant Metering Unit Temperature Sensor Circuit. This fault code is triggered when the Engine Control Module (ECM) detects a circuit malfunction in the temperature sensor of the reductant metering unit.

BMW DTC P20AC symptoms

Symptoms of DTC P20AC on a BMW may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Poor fuel efficiency
• Increased emissions

BMW DTC P20AC causes

Common causes of DTC P20AC on a BMW include:

• Faulty reductant metering unit temperature sensor
• Wiring or connector issues in the sensor circuit
• ECM software or hardware problems

BMW DTC P20AC seriousness

DTC P20AC should not be ignored as it can lead to increased emissions, reduced engine performance, and potential damage to the catalytic converter. It is recommended to address this issue promptly to prevent further complications.

How to diagnose DTC P20AC on BMW

To diagnose DTC P20AC on a BMW, a mechanic should perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes
2. Inspect the reductant metering unit temperature sensor and its wiring for any visible damage
3. Test the sensor’s resistance and voltage readings to determine if it is functioning correctly
4. Check for any loose connections or corrosion in the sensor circuit

How to fix DTC P20AC on BMW

To fix DTC P20AC on a BMW, the following steps can be taken:

1. Replace the faulty reductant metering unit temperature sensor
2. Repair or replace any damaged wiring or connectors in the sensor circuit
3. Clear the fault codes from the ECM memory
4. Perform a test drive to ensure the issue has been resolved

How to erase DTC P20AC on BMW

To erase DTC P20AC on a BMW, follow these steps:

1. Use a diagnostic scanner to access the ECM
2. Select the option to clear the fault codes
3. Confirm the deletion of the DTC P20AC code
4. Turn off the ignition and restart the vehicle to ensure the code has been successfully erased

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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