OBD-II code · Powertrain (generic, extended)
P20DB Exhaust Aftertreatment Fuel Supply Control Stuck Open
Aftertreatment fuel supply solenoid stuck open mechanically — fuel pressure cannot be cut off, risk of over-fueling exhaust.
Is it safe to drive with P20DB?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySolenoid stuck open
- 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
- P20D8Exhaust Aftertreatment Fuel Supply Control Performance
- P20D9Exhaust Aftertreatment Fuel Supply Control Circuit Low
- P20DAExhaust Aftertreatment Fuel Supply Control Circuit High
- P20DCExhaust Aftertreatment Fuel Supply Control Stuck Closed
- P20DDExhaust Aftertreatment Fuel Pressure Sensor Circuit
- P20DEExhaust Aftertreatment Fuel Pressure Sensor Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.