P20C4
Reductant Heater C Control Circuit High
P20C4 is an OBD-II diagnostic trouble code meaning: Reductant Heater C Control Circuit High. Common causes: open or short circuit in the heater circuit, heating element malfunction. Estimated repair cost: $28–167.
Symptoms
- Check Engine light comes on
- Reducing engine power (limp mode)
- 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
- Corroded contacts or damaged wiring harness
How to Fix
- Check heater circuit fuses and relays
- Inspect the wiring harness for damage
- Check the resistance of the heating element
- Scan the SCR control module for additional errors
- If necessary, replace the heating element or wiring
Related codes
Error P20C4 by Vehicle Brand
FAQ
What does the P20C4 code mean?
P20C4 is an OBD-II diagnostic trouble code that indicates: Reductant Heater C Control Circuit High
What causes a P20C4 error code?
The most common causes of P20C4 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 P20C4 diagnostic trouble code?
To fix P20C4: Check heater circuit fuses and relays. Inspect the wiring harness for damage. Check the resistance of the heating element. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P20C4?
Limited driving only, diagnose soon
How much does it cost to fix P20C4?
The estimated repair cost for P20C4 is $28–167. Actual cost depends on your vehicle, location, and labor rates.
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