P0CFB: Control Pilot Charging Switch A Circuit High
Standardized SAE J2012 code · P0Cxx — Hybrid and electric propulsion
Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.
What does P0CFB mean?
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.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Vehicle detected at the station but no energy flows
- Charging cannot be stopped normally
Common causes
- High Switch control or feedback wire shorted to a supply voltage
- Medium Output stage in the charging module no longer switching to ground
- Low Lost ground at the switch letting the line float high
Likelihood is a general estimate across vehicles; your make and model may differ.
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