Powertrain, generic · Hybrid propulsion

P0CF6 Control Pilot Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

A pilot level above the valid range usually means the line touches a supply voltage, or the measuring path in the module reads wrongly. GM evaluates it on the Chevrolet Volt (VICM/HPC2, 2012-2019) only while no cord is connected and the car is travelling at 8 km/h or faster, a moment when the pilot should be practically dead: a normalized pilot voltage (pilot voltage over battery voltage) above 0.55, or 0.58 in the 2012 table, in 30 of 50 samples at 100 ms sets the code. It is Type A, so the MIL comes on after one trip. The low-side counterpart is P0CF5, plausibility errors belong to P0CF4, an open line to P0CF3. With the pilot held high, the vehicle cannot pull the level down to request energy, and the station does not switch power on.

Likely causes

Pilot wire shorted to a 12 V feed in the harness or inlet
Pilot measuring circuit in the charging control module reading too high
Moisture in a connector coupling a neighbouring voltage onto the pilot

Symptoms

  • Malfunction indicator lamp on after a drive (GM Type A)
  • Charging does not begin at the station
  • Charging fault message in the cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

control pilot circuitwiring harnesson board charger

Related codes

P0CF3P0CF4P0CF5P0CF7

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, en.wikipedia.org.