P20C5 – BMW DTC

BMW DTC P20C5 – Reductant Heater ‘D’ Control Circuit/Open

DTC P20C5 meaning on BMW

The Diagnostic Trouble Code (DTC) P20C5 for BMW refers to the ¨Reductant Heater ‘D’ Control Circuit/Open¨ fault. This code indicates that there is an issue with the control circuit or an open circuit in the reductant heater ‘D’ system.

BMW DTC P20C5 symptoms

Symptoms of the DTC P20C5 on a BMW may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Possible decrease in fuel efficiency

BMW DTC P20C5 causes

Common causes of the DTC P20C5 on a BMW include:

• Faulty reductant heater ‘D’
• Open circuit in the control wiring
• Corrosion or poor connections in the wiring harness

BMW DTC P20C5 seriousness

The DTC P20C5 fault code should not be ignored, as it can lead to reduced engine performance and potential emissions issues. While the vehicle may still be operable, it is recommended to address this fault promptly to prevent further complications.

How to diagnose DTC P20C5 on BMW

To diagnose the DTC P20C5 on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data
2. Inspect the reductant heater ‘D’ system for any visible damage or corrosion
3. Check the wiring harness and connectors for any signs of wear or poor connections
4. Perform a continuity test on the control circuit to identify any open circuits

How to fix DTC P20C5 on BMW

To fix the DTC P20C5 on a BMW, you can try the following solutions:

1. Replace the faulty reductant heater ‘D’
2. Repair any open circuits in the control wiring
3. Clean or replace any corroded connectors in the system
4. Clear the fault code and perform a test drive to ensure the issue is resolved

How to erase DTC P20C5 on BMW

To erase the DTC P20C5 on a BMW, you can use a diagnostic scanner to clear the fault code from the vehicle’s memory. After addressing the underlying issue causing the fault code, clearing the code will reset the Check Engine Light and allow you to monitor the system for any 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

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.