Powertrain, generic

P0E7A Coolant Bypass Valve A Control Stuck Closed

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P0E7A is the reverse of P0E79: valve A should open and let coolant pass, but the temperature picture says it has stayed shut. Depending on what the valve connects, the result is a loop that gets no flow from the engine side, so heater output or heat transfer drops, or a branch that heats up because it is cut off from circulation. No manufacturer documents P0E7A publicly. The closest published case is the sibling on valve B: Stellantis sets P0E80 once the engine coolant reading and the electric heater inlet are over 40 °F apart, and blames misrouted hoses or a clogged three-way valve on Wrangler and Pacifica plug-in hybrids. Under CARB, actuators of this kind need a functional check as well. Electrical faults on valve A are P0E75 to P0E78.

Likely causes

Debris or deposits blocking valve A
Actuator or gear stuck in the closed position
Air pocket after a coolant service blocking flow

Symptoms

  • Little or no cabin heat
  • Rising coolant temperature in the affected loop
  • Check engine light

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–700
Time1–3 h

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

Parts involved

coolant bypass valve acooling system

Related codes

P0E79P0E78P0E80P26B1

References: static.nhtsa.gov, fordservicecontent.com, law.cornell.edu.