P0E76Coolant Bypass Valve A Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- With P0E76 the voltage on the control line of coolant bypass valve A stays lower than the driver expects for its current state, which points to a short to ground somewhere in the harness or inside the actuator. What happens next depends on the driver layout: a low-side output may leave the valve energised all the time, a high-side output can no longer move it at all, and the driver may switch off to protect itself. No manufacturer documents P0E76 publicly. In Ford's 2019 hybrid summary the matching job falls to P2682, flagged once the driver has signalled a fault continuously for over 5 s; only after that does Ford run its stuck-valve check P26AB. CARB requires circuit monitoring of output devices like this one. P0E77 is the high case, P0E75 an open; P0E79 and P0E7A cover a valve that is mechanically stuck.
- What you may notice
- Check engine light
- Valve stays in one position, heating behaves oddly
- Possible blown fuse if the short is hard
- Likely causes
- LikelyChafed control wire touching body or engine ground
- PossibleInternal short in the valve A actuator
- RareMoisture bridging pins in the valve connector
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.