Powertrain
Definition only
Lights the check engine lamp
P26BA: Engine Coolant Bypass Valve C Stuck/Open
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26BA mean?
The third coolant bypass valve is stuck open.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Valve seized open by sediment
- Medium Broken return spring
Likelihood is a general estimate across vehicles; your make and model may differ.
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P26BA in the community
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