Powertrain, generic

P0E7F Coolant Bypass Valve B Control Stuck/Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0E7F means coolant bypass valve B is judged to stay open while the module wants it closed. Stellantis documents it on the Chrysler Pacifica plug-in hybrid with the 3.6 litre engine: bulletin 07-008-23 (June 2023) covers cars built from 3 November 2022 to 10 February 2023, where machining debris from the cylinder head water jackets can collect inside the three-way valve. The MIL comes on and electric driving may be locked out while the petrol engine still works. To reproduce it, the bulletin has the car idle 10 minutes in engine mode, then run 5 minutes on battery with heat on and the blower below half; if P0E7F or P0E80 appears, the valve is replaced. The Hurricane software bulletins also list the code. P0E80 is the stuck closed case; P0E79 is the same fault on valve A.

Likely causes

Machining debris lodged in the three-way coolant valve (Pacifica Hybrid, bulletin 07-008-23)
Worn or broken internals in valve B
Calibration issue addressed by an engine control update (3.0 Hurricane)

Symptoms

  • MIL on
  • Electric drive mode unavailable, engine runs instead
  • Reduced or unstable cabin heat

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–700
Time0.5–2 h

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

Parts involved

coolant bypass valve bcooling system

Related codes

P0E80P0E7EP0E79U063C

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