P0CF3

Code

Generic P — Powertrain

Control Pilot Circuit /Open

Brand: Generic

Type: P — Powertrain

Views: UK: 22 EN: 29 RU: 31

AI status

Completed

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Page language: EN

Causes

Open or broken wiring in the control pilot circuit
Corroded or damaged charging inlet/pilot pin or EVSE connector
Blown fuse, tripped relay, or disconnected connector supplying the CP circuit
High-resistance connection or intermittent contact at connectors
Faulty charging inlet assembly or control pilot harness
Faulty vehicle charging control module or EVSE (external charger)

Symptoms

No charging initiation when plug connected
Charging stops shortly after start or cannot detect a plugged-in EVSE
Charge-related warning lamp or message on dash (charging fault)
Stored P0CF3 with related charge system faults or inhibited charging
Possible EVSE error lights or failure to handshake with vehicle

What to check

Obtain all stored DTCs and freeze-frame data from the vehicle charging/BCM/EVSE module
Visually inspect charging inlet, CP pin, harness, and EVSE plug for corrosion, bent pins, burns, or physical damage
Check fuses and relays related to charging/EVSE control circuits
Confirm connectors are fully seated and locking mechanisms engaged
Perform a wiggle test of the charging inlet harness while monitoring the CP circuit for intermittent behavior
Ensure correct safety procedures: isolate high-voltage systems and follow manufacturer safety guidelines before probing circuits

Signal parameters

Control Pilot is a pulse/square-wave control signal used for handshake and available-current indication (signal frequency typically ~1 kHz)
Signal uses a defined voltage range set by the EVSE and vehicle control module (often TTL-level or higher depending on system); duty cycle indicates available charge current
Expected: a stable periodic waveform present at charging inlet CP pin when EVSE is connected and vehicle ready to charge (oscilloscope measurement recommended)

Diagnostic algorithm

Record codes and freeze-frame data. Note conditions when fault set (ambient, charging state, connector type).
Visually inspect charging inlet, CP pin, cable, and mating EVSE connector for damage, corrosion, water intrusion, or foreign objects. Repair or replace as needed.
Check fuses/relays related to the charging/pilot circuit. Replace any blown fuses and re-test.
With vehicle powered and EVSE connected (follow HV safety rules), measure CP signal at the vehicle charging inlet while attempting to charge. Use an oscilloscope to verify presence, frequency, and duty cycle. If no signal, check upstream wiring.
Perform continuity check between charging inlet CP pin and the vehicle control module/charging module CP input. Expect low resistance; an open indicates wiring or connector fault.
If continuity exists but signal absent at module, verify module power/ground and diagnostic communication. If CP present at module but not at inlet, inspect/replace charging inlet assembly or harness.
If wiring and inlet are good, swap or bench-test the EVSE (if possible) to eliminate external charger fault. If EVSE known-good and vehicle still open, consider control module fault.
After repairs, clear codes, perform a controlled charge test, and monitor for reoccurrence. If intermittent, perform extended monitoring while flexing harnesses and connectors.

Likely causes

Broken or disconnected pilot wire between charging inlet and vehicle control module
Corroded/damaged pilot pin at the charging inlet or EVSE plug
Blown fuse or damaged connector in the CP supply circuit
Intermittent connector due to contamination or mechanical damage

Fault status

⚠️ Status

Control Pilot Circuit — Open (no continuity or missing pilot signal). Charging handshake failed; charging disabled until circuit continuity/signal restored.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours