Powertrain
Definition only
Lights the check engine lamp
P26C1: Engine Coolant Bypass Valve D Range/Performance
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26C1 mean?
The fourth 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 P26C1 on the same make and model first.
P26C1 in the community
Ask about P26C1No one has posted about P26C1 yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P26C1 problem