OBD-II code · Powertrain (generic, extended)
P20C6 Reductant Heater D Control Circuit Performance
Reductant heater D does not warm in time.
Is it safe to drive with P20C6?
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 D
Related codes
- P20BEReductant Heater B Control Circuit Performance
- P20C2Reductant Heater C Control Circuit Performance
- P20C5Reductant Heater D Control Circuit/Open
- P20C3Reductant Heater C Control Circuit Low
- P20C4Reductant Heater C Control Circuit High
- P20C7Reductant Heater D Control Circuit Low
- P20C8Reductant Heater D Control Circuit High
- P20C9Reductant Control Module Requested MIL Illumination
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.