Powertrain, generic

P0E76 Coolant Bypass Valve A Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Chafed control wire touching body or engine ground
Internal short in the valve A actuator
Moisture bridging pins in the valve connector

Symptoms

  • Check engine light
  • Valve stays in one position, heating behaves oddly
  • Possible blown fuse if the short is hard

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–450
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

coolant bypass valve awiring harness

Related codes

P0E75P0E77P0E78P0E79P2682

References: fordservicecontent.com, law.cornell.edu.