P20B7
Reductant Metering Unit Heater Control Circuit Low
P20B7 is an OBD-II diagnostic trouble code meaning: Reductant Metering Unit Heater Control Circuit Low. Common causes: open or short circuit in the heater circuit, poor contact in control circuit connectors. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Possible SCR System Error Message
- Reduced engine power in cold weather
- Increased fuel consumption
- Increased NOx emissions
Causes
- Open or short circuit in the heater circuit
- Poor contact in control circuit connectors
- Module heating element malfunction
- Problems with the SCR control unit
- Contact corrosion due to reagent exposure
How to Fix
- Check the integrity of the wiring and contacts in the heater circuit
- Measure the resistance of the heating element
- Check the voltage at the module connectors
- If necessary, replace the reagent dosing module
- Reset the error code and test run the system
Related codes
Error P20B7 by Vehicle Brand
FAQ
What does the P20B7 code mean?
P20B7 is an OBD-II diagnostic trouble code that indicates: Reductant Metering Unit Heater Control Circuit Low
What causes a P20B7 error code?
The most common causes of P20B7 include: Open or short circuit in the heater circuit; Poor contact in control circuit connectors; Module heating element malfunction; Problems with the SCR control unit.
How do I fix a P20B7 diagnostic trouble code?
To fix P20B7: Check the integrity of the wiring and contacts in the heater circuit. Measure the resistance of the heating element. Check the voltage at the module connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20B7?
Yes, but get it checked soon
How much does it cost to fix P20B7?
The estimated repair cost for P20B7 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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