Powertrain, generic (extended)

P2683 Engine Coolant Bypass Valve A Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

For P2683 the drive of bypass valve A is shorted toward supply voltage or draws too much current. GM's 2016 Volt table has the VICM evaluate a short-to-high report from motor driver 1 while the valve is stopped or commanded to the high position; 16 failures out of 20 samples at 100 ms give a Type B fault. Volkswagen's 2014 Touareg Hybrid with the CGFA engine judges current instead and trips above roughly 2.2 to 4 A, which points to a jammed or shorted valve motor as well as wiring. Ford's 2019 hybrid summary uses a driver fault lasting over 5 s, and Ford's 2014 gasoline list shows P2683 with MIL. Coolant routing is then stuck, so heater output, warm-up or cooling of the affected circuit may change.

Likely causes

Jammed valve or shorted valve motor drawing excess current
Drive wire shorted to battery voltage
Faulty motor driver in the control module

Symptoms

  • Check engine light on
  • Changed heater output or warm-up time
  • Temperature warning in severe cases

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

P2681P2682P26ABP26AE

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