OBD-II code · Powertrain (generic, extended)
P20DC Exhaust Aftertreatment Fuel Supply Control Stuck Closed
Aftertreatment fuel supply solenoid stuck closed — HC dosing into exhaust fails, regeneration cannot raise temperature.
Is it safe to drive with P20DC?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySolenoid stuck closed
- Less likelyCarbon or debris buildup preventing free movement
- Less likelyComponent wear with age - mechanical play
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Aftertreatment Fuel Supply Solenoid
Related codes
- P20D7Exhaust Aftertreatment Fuel Supply Control Circuit/Open
- P20D9Exhaust Aftertreatment Fuel Supply Control Circuit Low
- P20DAExhaust Aftertreatment Fuel Supply Control Circuit High
- P20DBExhaust Aftertreatment Fuel Supply Control Stuck Open
- P20DDExhaust Aftertreatment Fuel Pressure Sensor Circuit
- P20DEExhaust Aftertreatment Fuel Pressure Sensor Circuit Range/Performance
- P20DFExhaust Aftertreatment Fuel Pressure Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.