Powertrain
Definition only
Lights the check engine lamp
P26B0: Engine Coolant Bypass Valve B Range/Performance
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26B0 mean?
The second 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 P26B0 on the same make and model first.
P26B0 in the community
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