OBD-II code · Powertrain (generic, extended)
P20C1 Reductant Heater C Control Circuit/Open
Reductant heater C control circuit open.
Is it safe to drive with P20C1?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyHeater winding open
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
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
- P20B9Reductant Heater A Control Circuit/Open
- P20BDReductant Heater B Control Circuit/Open
- P20C5Reductant Heater D Control Circuit/Open
- P20BEReductant Heater B Control Circuit Performance
- P20BFReductant Heater B Control Circuit Low
- P20C0Reductant Heater B Control Circuit High
- P20C2Reductant Heater C Control Circuit Performance
- P20C3Reductant Heater C Control Circuit Low
- P20C4Reductant Heater C Control Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.