P26B4
Fuel Shutoff Valve A Control Circuit Stuck On
The first fuel shutoff valve stays open when commanded closed. Fuel cannot be cut off via this path during a safety event.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Valve seized open by debrisCommon
- ECU output driver stuck onPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Fuel Shutoff Valve A
- Solenoid
P26B4 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.