P0CFB code meaning
Control Pilot Charging Switch A Circuit High
What P0CFB means
P0CFB is the high-side counterpart: the control or feedback line of charging switch A, which loads the pilot with an extra 1.3 kΩ to request charging, shows a voltage above its valid band. Typical are a short to a supply voltage in the harness or connector, or an output stage in the charging module that no longer pulls the line down. No manufacturer documents this code publicly; the closest documented test is GM's P0CF9 on the Chevrolet Volt, which judges the switch by the pilot voltage it produces in a self-test (ratio 0.14-0.28), while CARB requires plug-in vehicles to monitor the charging system. Low readings are P0CFA, an open line P0CF8, dropouts P0CFC. For the driver the station typically stays in the plugged-in state without supplying power, or a session cannot be ended cleanly.
P0CFB at a glance
- Check engine lightUsually not
- 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 P0CFB
- Vehicle detected at the station but no energy flows
- Charging cannot be stopped normally
Common causes of P0CFB
- Most likelySwitch control or feedback wire shorted to a supply voltage
- PossibleOutput stage in the charging module no longer switching to ground
- Less likelyLost ground at the switch letting the line float high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Control pilot switch aWiring harnessOn board charger
What each part of P0CFB 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. |
| FB | The exact fault in that area. |
What to do next
- Note P0CFB 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 P0CFB
What does P0CFB mean?
P0CFB means "Control Pilot Charging Switch A Circuit High". P0CFB is the high-side counterpart: the control or feedback line of charging switch A, which loads the pilot with an extra 1.3 kΩ to request charging, shows a voltage above its valid band. It is a generic code, so it means the same on every make.
Is it safe to drive with P0CFB?
P0CFB does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0CFB fail an emissions test?
P0CFB 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 P0CFB to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0CFB clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.