P2C26Fuel Injector Group B Supply Sense Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Many engines feed their injectors in groups from a switched supply, for example through an injector relay or a high-side driver. A separate sense line lets the engine module read back whether voltage really arrives at group B. P2C26 is the general fault of that read-back: the sensed value is missing, erratic or not consistent with the commanded supply state. It differs from P2149–P2151, which concern the supply path of group B itself. No publicly accessible manufacturer document explains P2C26; the code rests on CARB's comprehensive component rules. GM's injector logic on the Saab 9-5 2.0T shows the general pattern for supply faults: an incorrect voltage for over 1 s with the engine above 80 rpm sets a Type B code and the injector is shut off. Misfire is possible.
- What you may notice
- Check engine light
- Possible misfire or rough running on the cylinders of group B
- Hard starting if the group is switched off
- Likely causes
- LikelyOpen or high-resistance sense wire between injector supply and module
- PossibleInjector relay or its socket making poor contact
- PossibleCorroded connector in the injector supply harness
- RareFaulty sense input inside the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.