P26B6Fuel Shutoff Valve B Control Circuit Stuck On
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P26B6 reports that shut-off valve B cannot be switched off: the control circuit or the valve remains in the on state after the module removes the command. No manufacturer documents P26B6 publicly. Where valve B is defined, it is a solenoid on the low-pressure side, for example the supply solenoid of the Roush propane rail pressure module (circuit code P2665) or, on GM's CNG Impala, one of two normally closed cut-off valves, the other sitting at the tank. Possible reasons are a control line shorted to power, a welded relay contact or a valve stuck open. Unlike P26B5, the engine usually still starts; the concern is that fuel is no longer sealed off when parked. CARB requires output components to be monitored. Repair soon and use the manual valve if gas is smelled.
- What you may notice
- Check engine light
- Fuel odour near the engine or regulator after shut-off
- Likely causes
- LikelyControl line shorted to battery voltage
- PossibleWelded relay contact keeping the valve powered
- PossibleValve B stuck open mechanically
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.