OBD-II code · Powertrain (generic, extended)
P20C2 Reductant Heater C Control Circuit Performance
Reductant heater C does not warm in time — partial fault.
Is it safe to drive with P20C2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPartial winding fault
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.7–3 h
- Emissions test
- Likely to fail
- Parts involved
- Reductant Line Heater C
Related codes
- P20BEReductant Heater B Control Circuit Performance
- P20C1Reductant Heater C Control Circuit/Open
- P20C6Reductant Heater D Control Circuit Performance
- P20BFReductant Heater B Control Circuit Low
- P20C0Reductant Heater B Control Circuit High
- P20C3Reductant Heater C Control Circuit Low
- P20C4Reductant Heater C Control Circuit High
- P20C5Reductant Heater D Control Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.