Powertrain, generic

P0E7C Coolant Bypass Valve B Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P0E7C says that the wiring which operates bypass valve B reads too low, typically because a wire or the actuator itself has a ground fault. Stellantis documents the code: bulletin 18-071-26 (revisions A and B, October 2026) for 2025 RAM 1500 pickups fitted with the Hurricane straight-six, SO or HO twin-turbo and bulletin 18-082-26 for the 2025 Wagoneer and Grand Wagoneer name it among the faults cured by new engine control software, with the check engine light on. That points to calibration as a frequent trigger on these engines, besides real wiring damage. A low reading on the line keeps the valve from being driven as intended, so the coolant split between loops is no longer under control. CARB lists such outputs among the components that need circuit monitoring. High and open faults are P0E7D and P0E7B.

Likely causes

Engine control software needing the update from the manufacturer bulletin (Stellantis 3.0 Hurricane)
Valve B control wire shorted to ground
Internal short in the valve B actuator

Symptoms

  • Check engine light
  • Often no noticeable driving symptom

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–400
Time0.5–2 h

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

Parts involved

coolant bypass valve bwiring harness

Related codes

P0E7BP0E7DP0E7EP0E76U063C

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