Powertrain, generic (extended)

P2682 Engine Coolant Bypass Valve A Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2682 narrows the drive fault of bypass valve A to the low side: the output is pulled toward ground when it should not be. In GM's 2016 table for the second-generation Volt, the VICM sets it when motor driver 1 reports a short to low while the valve is commanded to the low position, with 4 failures in 5 samples and Type B. Ford's 2019 hybrid summary flags P2682 after a driver fault longer than 5 s, and it must be present before the stuck-open test P26AB can finish. Volkswagen's 2014 Touareg Hybrid (CGFA) uses a signal voltage below about 2.8 to 3.2 V. Ford's 2014 gasoline list marks it as a MIL code. The valve stays where it was, so warm-up or heat distribution may suffer.

Likely causes

Drive wire to the valve motor shorted to ground
Internal short in the valve motor or electronics
Coolant or water corrosion in the valve plug

Symptoms

  • Check engine light on
  • Weak cabin heat or slow warm-up
  • Possible overheating warning under load

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
Time0.5–2.5 h

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

Parts involved

coolant bypass valve asolenoidwiring harness

Related codes

P2681P2683P26ABP26AD

References: gsi.ext.gm.com, fordservicecontent.com, static.nhtsa.gov, performanceparts.ford.com.