Powertrain, generic · Computer and auxiliary outputs

P06E4 Control Module Wake-up Circuit Performance

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Control modules are woken by a dedicated wake-up line or a network wake-up – at ignition on, when a charging cable is plugged in, or on a timer for engine-off diagnostics and battery management. P06E4 means this wake-up signal is implausible: the module wakes too late or not at all, stays awake, or the line state does not match the network status. In practice the code appears mainly on hybrids: FCA fixes it on the Pacifica plug-in hybrid and the Wrangler 4xe with module software, where it remained as a permanent code that blocked emission inspections; GM's hybrid integration module lists it as a fault bundle. No manufacturer publishes thresholds or timing.

Likely causes

Module software (false setting, permanent code does not clear)
Wake-up line or connector open or shorted
Weak 12 V battery, voltage dips at wake-up
Engine or hybrid control module faulty

Symptoms

  • Check engine light
  • Permanent code blocks emission inspection
  • Possibly battery drain (module stays awake)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–400
Time0.5–2 h

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

Parts involved

wake up circuitengine control modulehybrid control module

Related codes

P0685P0686P068AP068BP2534

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, gsi.ext.gm.com.