P2C27
Fuel Injector Group B Supply Sense Circuit Low
Voltage on the supply sense circuit of fuel injector group B is below the expected window. Indicates collapsed supply or short to ground.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
Common causes
Ordered by how often each turns out to be the cause.
- Supply rail collapsed under loadCommon
- Sense wire shorted to groundPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Fuel Injector Group B
- Wiring Harness
- ECM
P2C27 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.