P26B6 code meaning
Fuel Shutoff Valve B Control Circuit Stuck On
Powertrain system Generic code P26xx codes Check engine light
What P26B6 means
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.
P26B6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 3.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P26B6
- Check engine light
- Fuel odour near the engine or regulator after shut-off
Common causes of P26B6
- Most likelyControl line shorted to battery voltage
- PossibleWelded relay contact keeping the valve powered
- PossibleValve B stuck open mechanically
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel shutoff valve bSolenoid
What each part of P26B6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| B6 | The exact fault in that area. |
What to do next
- Note P26B6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P26B6
What does P26B6 mean?
P26B6 means "Fuel Shutoff Valve B Control Circuit Stuck On". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P26B6?
Drive gently and only to a workshop. With P26B6 the car can go into limp mode (reduced power) to protect itself.
Will P26B6 fail an emissions test?
Yes, it can. P26B6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P26B6 to fix?
Difficulty: hard. A typical repair takes 1 to 3.5 hours of work. This is a job for a workshop.
Will P26B6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.