Powertrain
generic / SAE
P20DA
Exhaust Aftertreatment Fuel Supply Control Circuit High
Aftertreatment fuel supply control line stuck high — short to B+. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / DA
Possible causes
- Short to B+ high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 150–1200 €
- Estimated time: 0.7–3.5 h
- Component: aftertreatment fuel pump
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012