BMW DTC P20C1 – Reductant Heater ‘C’ Control Circuit/Open
DTC P20C1 meaning on BMW
The DTC P20C1 code on a BMW indicates an issue with the Reductant Heater ‘C’ Control Circuit being open. This means that there is a malfunction in the circuit that controls the reductant heater, which is a component of the Selective Catalytic Reduction (SCR) system used to reduce emissions.
BMW DTC P20C1 symptoms
Symptoms of the DTC P20C1 code on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Increased fuel consumption
- Failed emissions test
BMW DTC P20C1 causes
Common causes of the DTC P20C1 code on a BMW include:
- Faulty reductant heater ‘C’
- Open or short circuit in the reductant heater control circuit
- Defective SCR system components
- Wiring issues
BMW DTC P20C1 seriousness
The DTC P20C1 code should be addressed promptly as it can lead to increased emissions and potential engine performance issues. Ignoring this code may result in the vehicle failing emissions tests and could potentially cause damage to other components of the SCR system.
How to diagnose DTC P20C1 on BMW
To diagnose the DTC P20C1 code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the reductant heater ‘C’ and its control circuit for any visible damage
- Check the wiring and connectors for any signs of wear or corrosion
- Test the reductant heater ‘C’ and control circuit for proper operation
How to fix DTC P20C1 on BMW
To fix the DTC P20C1 code on a BMW, the following steps may be taken:
- Replace the faulty reductant heater ‘C’ if necessary
- Repair any open or short circuits in the control circuit
- Address any wiring issues or connector problems
- Clear the fault codes and test drive the vehicle to ensure the issue has been resolved
How to erase DTC P20C1 on BMW
To erase the DTC P20C1 code on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the vehicle’s computer system. Once the codes have been cleared, the Check Engine Light should turn off. It is important to ensure that the underlying issue causing the fault code has been addressed before clearing the code.
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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