P0CF5 code meaning
Control Pilot Circuit Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0CF5 means
Circuit Low means the pilot level sits under the lowest value any regular charging state can produce, as happens when the pilot wire is shorted to ground or to the protective earth contact. GM checks it in the Chevrolet Volt VICM/HPC2 tables from 2012 to 2019: with the cord unplugged, the controller feeds its own test signal through the internal diagnostic switch, and the ratio of pilot voltage to 12 V battery voltage must not fall below 0.03. 30 failures within 50 samples at 100 ms set the code as Type A, so the MIL lights after a single trip. A missing signal is P0CF3, an excessive level P0CF6, an implausible one P0CF4. While the line is pulled down, the vehicle cannot show the station that it is connected and ready, so charging does not begin.
P0CF5 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0CF5
- Malfunction indicator lamp on (GM Type A)
- Station does not detect the vehicle, charging never starts
- Charge status indicator shows a fault after plugging in
Common causes of P0CF5
- Most likelyPilot wire chafed through and touching ground or the protective earth conductor
- PossibleWater or corrosion bridging pilot and earth pins in the charge inlet
- Less likelyFailed pilot input or test circuit in the charging control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Control pilot circuitCharge portWiring harnessOn board charger
What each part of P0CF5 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| F5 | The exact fault in that area. |
What to do next
- Note P0CF5 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0CF5
What does P0CF5 mean?
P0CF5 means "Control Pilot Circuit Low". Circuit Low means the pilot level sits under the lowest value any regular charging state can produce, as happens when the pilot wire is shorted to ground or to the protective earth contact. It is a generic code, so it means the same on every make.
Is it safe to drive with P0CF5?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0CF5 fail an emissions test?
P0CF5 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0CF5 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0CF5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.