Powertrain, generic

P0E7B Coolant Bypass Valve B Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P0E7B covers an interrupted control circuit of the second coolant bypass valve, B. The module sees no proper load on its output, so the valve cannot be positioned and stays wherever it last was or springs back to its rest position. Stellantis does use the valve B family: its 2025 and 2026 bulletins for the RAM 1500 and the Wagoneer with the 3.0 litre Hurricane engine list P0E7C to P0E7F together with U063C, a lost link to the valve B actuator, and its plug-in hybrids use P0E7F and P0E80. P0E7B itself appears in none of these published documents. Ford's 2019 hybrid summary shows the usual circuit test on a comparable valve, a driver fault lasting over 5 seconds. CARB requires circuit checks on such outputs. Short and plausibility faults are P0E7C to P0E7E.

Likely causes

Broken wire or unplugged connector at valve B
Internal open in the valve B actuator
Missing supply or ground at a networked valve actuator

Symptoms

  • Check engine light
  • Heating or engine warm-up behaves differently

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 bwiring harness

Related codes

P0E7CP0E7DP0E7EP0E75U063C

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