P20B9
Reductant Heater A Control Circuit/Open
P20B9 is an OBD-II diagnostic trouble code meaning: Reductant Heater A Control Circuit/Open. Common causes: broken wire in the heater circuit, heating element malfunction. Estimated repair cost: $17–89.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- SCR System Error Message
- Emission control system malfunction
Causes
- Broken wire in the heater circuit
- Heating element malfunction
- Heater control relay problems
- Short circuit in the circuit
- SCR control module malfunction
How to Fix
- Check the integrity of wires and connections
- Check the resistance of the heating element
- Check the operation of the control relay
- Check heater circuit fuses
- Diagnostics of the SCR control module
Related codes
Error P20B9 by Vehicle Brand
FAQ
What does the P20B9 code mean?
P20B9 is an OBD-II diagnostic trouble code that indicates: Reductant Heater A Control Circuit/Open
What causes a P20B9 error code?
The most common causes of P20B9 include: Broken wire in the heater circuit; Heating element malfunction; Heater control relay problems; Short circuit in the circuit.
How do I fix a P20B9 diagnostic trouble code?
To fix P20B9: Check the integrity of wires and connections. Check the resistance of the heating element. Check the operation of the control relay. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20B9?
Yes, but get it checked soon
How much does it cost to fix P20B9?
The estimated repair cost for P20B9 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat