P20BB
Reductant Heater A Control Circuit Low
P20BB is an OBD-II diagnostic trouble code meaning: Reductant Heater A Control Circuit Low. Common causes: open or short circuit in the heater circuit, heating element malfunction. Estimated repair cost: $56–167.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- SCR system error message on dashboard
- Problems starting in cold weather
Causes
- Open or short circuit in the heater circuit
- Heating element malfunction
- Relay or fuse problems
- SCR control module malfunction
- Poor contact in wiring connectors
How to Fix
- Check heater circuit fuses and relays
- Inspect wiring and connectors for damage
- Check the resistance of the heating element
- Test the operation of the SCR control module
- Replace the faulty heater if necessary
Related codes
Error P20BB by Vehicle Brand
FAQ
What does the P20BB code mean?
P20BB is an OBD-II diagnostic trouble code that indicates: Reductant Heater A Control Circuit Low
What causes a P20BB error code?
The most common causes of P20BB include: Open or short circuit in the heater circuit; Heating element malfunction; Relay or fuse problems; SCR control module malfunction.
How do I fix a P20BB diagnostic trouble code?
To fix P20BB: Check heater circuit fuses and relays. Inspect wiring and connectors for damage. Check the resistance of the heating element. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20BB?
Yes, but get it checked soon
How much does it cost to fix P20BB?
The estimated repair cost for P20BB is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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