Powertrain, generic (extended)

P2D80 Charging Start Switch Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2D80 is set when the start switch line is dragged below its valid voltage, typically through a short to ground or a contact that stays closed on a button that grounds the input when pressed. No manufacturer documents P2D80 publicly. In that common layout a grounded line reads as a start button held down forever. The risk differs from the stop switch: a stuck start request could begin charging against a timer setting or keep re-requesting a session, so the control unit is expected to set the code and stop acting on the input. Where low is instead the idle state, presses are simply lost. CARB demands that distinct out-of-range faults of such inputs get separate codes, hence this code beside P2D7F. The stop switch has its own low code, P2D7B.

Likely causes

Start switch signal wire shorted to ground
Start switch contact stuck closed or bridged by moisture
Corrosion in the connector creating a path to ground

Symptoms

  • Charging ignores the timer or starts unexpectedly before the code is set
  • Start button no longer works after the fault is detected

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–400
Time0.5–2.5 h

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

Parts involved

charging start switchwiring harness

Related codes

P2D7FP2D7EP2D7B

References: law.cornell.edu, patents.google.com.