P20B6
Reductant Metering Unit Heater Control Circuit Performance
P20B6 is an OBD-II diagnostic trouble code meaning: Reductant Metering Unit Heater Control Circuit Performance. Common causes: open or short circuit in the heater circuit, malfunction of the heating element of the injection unit. Estimated repair cost: $56–278.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- Possible starting problems in cold weather
- AdBlue system error message on the dashboard
Causes
- Open or short circuit in the heater circuit
- Malfunction of the heating element of the injection unit
- Problems with the heater circuit relay or fuse
- SCR control module malfunction
- Poor contact in heater circuit connectors
How to Fix
- Check heater circuit fuses and relays
- Check the integrity of wires and connectors
- Measure the resistance of the heating element
- Check the operation of the SCR control module
- If necessary, replace the AdBlue injection unit
Related codes
Error P20B6 by Vehicle Brand
FAQ
What does the P20B6 code mean?
P20B6 is an OBD-II diagnostic trouble code that indicates: Reductant Metering Unit Heater Control Circuit Performance
What causes a P20B6 error code?
The most common causes of P20B6 include: Open or short circuit in the heater circuit; Malfunction of the heating element of the injection unit; Problems with the heater circuit relay or fuse; SCR control module malfunction.
How do I fix a P20B6 diagnostic trouble code?
To fix P20B6: Check heater circuit fuses and relays. Check the integrity of wires and connectors. Measure the resistance of the heating element. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20B6?
Yes, but get it checked soon
How much does it cost to fix P20B6?
The estimated repair cost for P20B6 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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