P20D7
Exhaust Aftertreatment Fuel Supply Control Circuit/Open
The control circuit for the dedicated aftertreatment fuel supply pump or solenoid is open — HC dosing into the exhaust will fail.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Winding or coil openCommon
- Pin pushed back out of connector bodyLess likely
- Cracked solder joint inside the module or sensorLess likely
Parts involved
- Aftertreatment Fuel Pump
- Aftertreatment Fuel Supply Solenoid
P20D7 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.