Powertrain
Definition only
Lights the check engine lamp
P26B4: Fuel Shutoff Valve A Control Circuit Stuck On
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26B4 mean?
The first fuel shutoff valve stays open when commanded closed. Fuel cannot be cut off via this path during a safety event.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Valve seized open by debris
- Medium ECU output driver stuck on
- Low Carbon or debris buildup preventing free movement
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P26B4 on the same make and model first.
P26B4 in the community
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