P26BF: Engine Coolant Bypass Valve D Control Circuit High
Standardized SAE J2012 code · P26xx — Computer and output circuits
What does P26BF mean?
Voltage on the fourth coolant bypass valve control line is above the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Control wire shorted to B+
- Medium Open solenoid coil
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P26BF on the same make and model first.
P26BF in the community
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