Powertrain, generic (extended)

P2D7F Charging Start Switch Circuit High

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P2D7F reports a start switch line sitting above its allowed voltage, caused by an open wire or contact on a pulled-up input or by contact with a supply voltage. No manufacturer documents P2D7F publicly. With a start button the consequences run the other way than with the stop switch P2D7A. If the input idles high and the button grounds it, an open circuit hides every press, so a timer-delayed session cannot be brought forward. If the button drives the line high, the fault resembles a permanent start command, and a well-designed control unit will not act on a signal it has flagged as faulty, so charging may wait for the timer or the next plug-in. Honda's early charger shows why the input matters: there the start switch alone released charging. Low counterpart: P2D80.

Likely causes

Open circuit in the start switch line or connector (pull-up design)
Start switch signal wire shorted to a supply voltage
Start switch contact no longer closes

Symptoms

  • Start button has no effect
  • Charging begins only by timer or after re-plugging

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

P2D80P2D7EP2D7A

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