Powertrain
Definition only
Lights the check engine lamp
P26BC: Engine Coolant Bypass Valve C Stuck Closed
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26BC mean?
The third coolant bypass valve is stuck closed.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Valve seized closed by debris
- Medium Actuator linkage jammed in closed position
- 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 P26BC on the same make and model first.
P26BC in the community
Ask about P26BCNo one has posted about P26BC yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P26BC problem