BMW DTC P20B3 – Reductant Heater Coolant Control Valve Circuit Low
DTC P20B3 meaning on BMW
The Diagnostic Trouble Code (DTC) P20B3 for BMW refers to an issue with the Reductant Heater Coolant Control Valve Circuit being detected as low. This code indicates a problem with the electrical circuit associated with the coolant control valve for the reductant heater system in the vehicle.
BMW DTC P20B3 symptoms
Symptoms of the BMW DTC P20B3 may include:
- Check Engine Light illuminated on the dashboard
- Reduced engine performance or power
- Possible decrease in fuel efficiency
BMW DTC P20B3 causes
Common causes of the BMW DTC P20B3 may include:
- Faulty Reductant Heater Coolant Control Valve
- Wiring or connector issues in the circuit
- Software or programming issues
BMW DTC P20B3 seriousness
The seriousness of the BMW DTC P20B3 code lies in its potential impact on the vehicle’s emissions control system. If left unresolved, it can lead to increased emissions and may cause the vehicle to fail emissions tests.
How to diagnose DTC P20B3 on BMW
To diagnose the DTC P20B3 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the specific fault code
- Inspect the Reductant Heater Coolant Control Valve and associated wiring for any visible damage
- Test the electrical circuit for proper voltage and continuity
- Check for any software updates or reprogramming needed
How to fix DTC P20B3 on BMW
To fix the DTC P20B3 on a BMW, the following steps may be taken:
- Replace the faulty Reductant Heater Coolant Control Valve if necessary
- Repair any damaged wiring or connectors in the circuit
- Perform any required software updates or reprogramming
How to erase DTC P20B3 on BMW
To erase the DTC P20B3 on a BMW, the fault code can be cleared using a diagnostic scanner. After the necessary repairs have been made, the code can be reset to see if the issue has been resolved.
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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