P2C27Fuel Injector Group B Supply Sense Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2C27 reports that the voltage read back on the supply sense line of injector group B is too low while the module expects the group to be powered. In practice the feed never reaches the injectors – a blown fuse, a relay that does not close, a broken supply wire or a grounded feed – or only the sense wire itself is grounded. In the first case the cylinders of group B receive no fuel and misfire or stay dead; in the second the engine may run normally. No publicly accessible manufacturer source documents P2C27; CARB requires out-of-range low checks of such circuits. GM's direct-injection logic, documented for the Saab 9-5 2.0T, disables an injector once its supply voltage is wrong for more than 1 s and stores a Type B fault. The high case is P2C28.
- What you may notice
- Check engine light
- Misfire on several cylinders, rough idle
- Clearly reduced power or engine will not start
- Likely causes
- LikelyBlown fuse in the injector group B supply
- PossibleInjector relay not closing or burnt contacts
- PossibleSupply or sense wire shorted to ground
- RareInternally shorted injector pulling the group supply down
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.