Powertrain
generic / SAE
P2156
Fuel Injector Group D Supply Voltage Circuit Low
The supply voltage feeding injector group D has dropped below the lower limit. The injectors in this group lose drive voltage and may stop firing, so the cylinders they serve run lean or cut out. Causes: a blown fuse, a failed injector supply relay, a voltage drop in the supply harness, or a poor ground or connector on the group-D supply.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 56
Possible causes
- Fuse, relay, or wiring fault on supply high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation 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: possible
- Estimated cost: 40–400 €
- Estimated time: 0.5–2 h
- Component: fuel injector group d
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012