BMW DTC P20C3 – Reductant Heater ‘C’ Control Circuit Low
DTC P20C3 meaning on BMW
The DTC P20C3 code on a BMW indicates a fault in the reductant heater ‘C’ control circuit. This circuit is responsible for controlling the heating element in the reductant system, which is used to reduce harmful emissions in the exhaust gases.
BMW DTC P20C3 symptoms
Symptoms of the DTC P20C3 code on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Increased fuel consumption
- Failed emissions test
BMW DTC P20C3 causes
Common causes of the DTC P20C3 code on a BMW include:
- Faulty reductant heater ‘C’
- Wiring issues in the control circuit
- Defective reductant heater control module
- Corrosion or poor connections in the circuit
BMW DTC P20C3 seriousness
The DTC P20C3 code should not be ignored as it can lead to increased emissions and potential engine performance issues. It is important to address this code promptly to ensure the vehicle operates efficiently and meets emission standards.
How to diagnose DTC P20C3 on BMW
To diagnose the DTC P20C3 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the reductant heater ‘C’ and its wiring for any visible damage or corrosion
- Test the reductant heater control module for proper function
- Check the circuit connections and continuity
How to fix DTC P20C3 on BMW
To fix the DTC P20C3 code on a BMW, the following steps may be taken:
- Replace the faulty reductant heater ‘C’ if necessary
- Repair any damaged or corroded wiring in the control circuit
- Replace the reductant heater control module if it is defective
- Clean or repair any poor connections in the circuit
How to erase DTC P20C3 on BMW
To erase the DTC P20C3 code on a BMW, a diagnostic scanner can be used to clear the code after the underlying issue has been addressed and fixed. Once the repairs have been made, the code can be cleared to reset the Check Engine Light and ensure proper operation of the vehicle.
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.