A damaged or corroded control pilot pin or terminal in the vehicle's charge port, often from wear or moisture intrusion.; A break or short in the control pilot wiring harness between the charge port and the onboard charger or control module.; A faulty onboard charger or charging control module that cannot correctly interpret or generate the control pilot signal.; A poor ground connection at the charge port or charging module, causing the control pilot voltage to sag.; Water intrusion into the charge port assembly or wiring connectors, leading to corrosion and low signal voltage.; A malfunctioning charging station or cable that is not providing the correct pilot signal, though this is less common and usually sets a different code.; A software or calibration issue in the charging control module that misreads the control pilot voltage.

DTC codes / P0Cxx · Hybrid propulsion / P0CF5

P0CF5Control Pilot Circuit Low

Q: What does code P0CF5 mean?

Control Pilot Circuit Low. P0CF5 indicates that the powertrain control module has detected a low voltage condition on the control pilot circuit, which is the communication line used to manage charging between an electric vehicle and its charging equipment. The computer compares the expected signal voltage on this circuit against the actual reading and sets the code when the voltage stays below the acceptable threshold for a calibrated period.

P0CF5 indicates that the powertrain control module has detected a low voltage condition on the control pilot circuit, which is the communication line used to manage charging between an electric vehicle and its charging equipment. The computer compares the expected signal voltage on this circuit against the actual reading and sets the code when the voltage stays below the acceptable threshold for a calibrated period.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

The charging system may fail to initiate or may stop charging unexpectedly, leaving the vehicle without a charge.
A warning light on the dashboard, often a generic check engine light or a dedicated charging system indicator, illuminates.
The vehicle may refuse to enter or complete a charging session even when plugged into a known-good charging station.
In some cases, the driver may notice no symptoms besides the warning light, especially if the fault is intermittent.
The charging port may show signs of overheating, corrosion, or physical damage that affects the control pilot signal.
The vehicle may default to a reduced charging rate or disable high-voltage charging entirely as a protective measure.

Common causes, most likely first

A damaged or corroded control pilot pin or terminal in the vehicle's charge port, often from wear or moisture intrusion.
A break or short in the control pilot wiring harness between the charge port and the onboard charger or control module.
A faulty onboard charger or charging control module that cannot correctly interpret or generate the control pilot signal.
A poor ground connection at the charge port or charging module, causing the control pilot voltage to sag.
Water intrusion into the charge port assembly or wiring connectors, leading to corrosion and low signal voltage.
A malfunctioning charging station or cable that is not providing the correct pilot signal, though this is less common and usually sets a different code.
A software or calibration issue in the charging control module that misreads the control pilot voltage.

How to diagnose and fix it

Inspect the charge port and control pilot pin for corrosion, damage, or debris, and clean or replace the port as needed.
Check the control pilot wiring for continuity, shorts to ground, and resistance, repairing any damaged sections.
Verify the ground connection at the charge port and charging module, tightening or cleaning as necessary.
Test the control pilot signal with an oscilloscope or appropriate diagnostic tool to confirm the voltage level and duty cycle.
Substitute a known-good charging cable or station to rule out external equipment before condemning vehicle components.
If the signal is correct at the port but not at the module, replace the wiring harness; if the signal is incorrect at the module, replace the onboard charger or control module.
Clear the code and perform a charging test to confirm the repair, monitoring live data for the control pilot voltage.

Control Pilot Circuit Low Voltage Traps

A control pilot circuit low code is often caused by a dirty or worn charge port pin rather than a failed onboard charger, so always inspect and clean the port before replacing expensive modules.
Intermittent low voltage can be caused by a charging cable that is partially inserted or a station with a faulty pilot signal, so test with a known-good cable and station first.
The control pilot circuit is a low-voltage signal circuit, and a poor ground at the charge port can pull the voltage down without any visible damage, so ground integrity is critical.
Some vehicles set this code when the 12-volt battery is weak because the charging control module may not operate correctly under low supply voltage, so check the 12-volt system before deep diagnosis.
After repairs, the code may remain stored until a complete charging cycle is performed, so clearing the code without a successful charge test can lead to a false comeback.

Can I keep driving with P0CF5?

You can usually drive the vehicle normally because the control pilot circuit only affects charging, but avoid relying on the vehicle for long trips until the fault is repaired. Do not attempt to charge if you see signs of overheating or damage at the charge port, as this could pose a safety risk.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.