Powertrain
Definition only
Lights the check engine lamp
P26BB: Engine Coolant Bypass Valve C Range/Performance
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26BB mean?
The third coolant bypass valve responds to commands but the resulting coolant temperature behaviour is not as expected.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Valve partially stuck by sediment
- Medium Weak return spring fails to close fully
- Low Sensor element aged beyond calibration window
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P26BB on the same make and model first.
P26BB in the community
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