Powertrain
generic / SAE
P2151
Fuel Injector Group B Supply Voltage Circuit High
Supply rail to injector group B above the upper threshold — typically a stuck-closed regulator or alternator overshoot.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 51
Possible causes
- Charging system overvoltage high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–600 €
- Estimated time: 0.7–3 h
- Component: fuel injector group b
- Component: voltage regulator
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012