Code result
P26A4
Engine Coolant Bypass Valve A Position Sensor Circuit
Moderate severity
What it means
The position sensor on the coolant bypass valve A returns no usable signal. Closed-loop control of bypass position is lost.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Open sensor element
highOne of the most commonly reported causes for this code — check this first.
Corroded sensor connector
mediumA plausible cause — test and verify before replacing parts.
Related help
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