Powertrain, generic (extended)

P2E64 Engine Coolant Bypass Valve E Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2E64 is the high-side counterpart: the control line of coolant bypass valve E carries more voltage than expected, usually because it touches a supply wire, or the load has gone open in a way the output stage reads as high. Valve E itself appears in no public manufacturer document. Ford's 2024 summary shows how this is commonly grouped: for its valves A to D the smart driver's short-to-battery result (fault byte 12) is filed under the High code, for example P26BF for valve D, alongside the general circuit code. Toyota pairs short to battery and open circuit in one subtype, P268115. A supplier patent (AMI Semiconductor) separates the cases by driving test currents into the pin and comparing the resulting voltage with thresholds. Check for chafing against live wires and water in the connector.

Likely causes

Drive wire chafed through and touching a battery-voltage wire
Moisture or coolant in the connector creating a path to supply voltage
Open actuator winding that the output stage reads as high voltage
Defective output stage in the engine control module

Symptoms

  • Check engine light
  • Valve is not driven and stays in its de-energised position
  • Possible change in heater output or warm-up time

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–600
Time0.5–3 h

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

Parts involved

engine coolant bypass valve ewiring harnessecm

Related codes

P2E62P2E63P2683P26BFP26B9

References: law.cornell.edu, fordservicecontent.com, static.nhtsa.gov, image-ppubs.uspto.gov.