P0CFD: Control Pilot Charging Switch A Stuck Off
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 P0CFD mean?
Stuck Off means the module commands charging switch A closed, but the pilot does not show the expected effect: the level stays at the connected value of about 9 V instead of dropping to around 6 V, so the station never receives a charge request. Possible are a switch or relay that no longer closes, an open resistor in the 1.3 kΩ branch, or a fault in the pilot measuring path. No manufacturer documents this code publicly; GM's plausibility test P0CF9 on the Chevrolet Volt evaluates the same switch from the pilot voltage during a self-test, and CARB requires the charging system to be monitored on plug-in vehicles. Its opposite is P0CFE, a switch that will not open; circuit faults are P0CF8 to P0CFB. The car is detected at the station and may report that it is plugged in, but charging never starts.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Symptoms
- Vehicle shows plugged in, but charging never begins
- Charging station remains in standby or connected state
Common causes
- High Charging switch or relay in the module no longer closing
- Medium Open resistor or solder joint in the 1.3 kΩ branch
- Low Charging module software not issuing the close command correctly
Likelihood is a general estimate across vehicles; your make and model may differ.
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