Powertrain, generic

P0E75 Coolant Bypass Valve A Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P0E75 is the basic electrical code for coolant bypass valve A: the control unit finds that the output switching the valve, or the wire leading to it, does not form a closed circuit, in most cases because of an open. Valves of this kind usually divert coolant between loops, for example between the engine and a heater loop that keeps the cabin warm while a hybrid drives electrically. No manufacturer documents P0E75 publicly. Ford's 2019 hybrid and plug-in summary watches a comparable valve under the older codes P2682 and P2683 and relies on the fault status of its smart driver, which must persist beyond 5 s. CARB counts such actuators among the comprehensive components that need circuit checks. Low, high and plausibility faults of this circuit are P0E76 to P0E78; drivers mostly notice weaker heating.

Likely causes

Broken wire or loose connector on the valve A control circuit
Burnt or internally open coil/motor in valve A
Coolant or water ingress corroding the valve connector pins
Faulty output driver in the engine or hybrid control module

Symptoms

  • Check engine light
  • Little or no cabin heat, especially in electric mode
  • Engine warms up more slowly or runs more often than usual

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

P0E76P0E77P0E78P0E7BP2682

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