Powertrain
generic / SAE
P21ED
Cylinder 9 Injector B Circuit High
Cylinder 9 second-injector (B) drive line stuck high — short to B+. A flow-deviating injector throws off cylinder balance — adjacent cylinders run leaner/richer to compensate, often masking the root cause until the trim limit is hit.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / ED
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: 200–1500 €
- Estimated time: 1–4 h
- Component: fuel injector
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012