Dirty, damaged, corroded or wet pins in the charge inlet or charging cable plug; Faulty charging cable or portable charging unit with a poor or incorrect pilot signal; Wiring damage, chafing or high resistance between the charge inlet and the charger control module; Poor connection or water ingress at the charger control module connector; Fault with the charge point (supply equipment) giving an out-of-range pilot signal; Faulty on-board charger or charge control module; Outdated control unit software where a known fault is documented by the manufacturer.

P0CF4

Control Pilot Circuit Range/Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
F4: FaultThe specific fault in that area

What it means

P0CF4 is a generic code for a range or performance fault in the control pilot circuit, the signal line between the charging equipment and the vehicle's on-board charging control on a plug-in hybrid or electric vehicle. The control unit saw the pilot signal (its voltage level or duty cycle) outside the expected range, or not behaving as it should, during plug-in or charging. The exact signal limits and which module monitors the circuit depend on the model.

Symptoms

Vehicle will not start charging or stops charging part-way
Charging fault or plug warning message on the dashboard
Charge port light or indicator shows an error or does not light
Charging works on one charge point but not on another
Intermittent charging that depends on cable movement or weather
Hybrid system warning light on, with the car otherwise drivable

Possible causes

Dirty, damaged, corroded or wet pins in the charge inlet or charging cable pluglikely
Faulty charging cable or portable charging unit with a poor or incorrect pilot signallikely
Wiring damage, chafing or high resistance between the charge inlet and the charger control modulepossible
Poor connection or water ingress at the charger control module connectorpossible
Fault with the charge point (supply equipment) giving an out-of-range pilot signalpossible
Faulty on-board charger or charge control modulerare
Outdated control unit software where a known fault is documented by the manufacturerrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting whether the fault occurred when plugging in or during charging
Check whether the fault repeats with a different charging cable and a different charge point to separate vehicle faults from equipment faults
Inspect the charge inlet and cable plug for bent, burnt, corroded or contaminated pins, damaged seals and water ingress
Check the charge port locking mechanism and the inlet wiring for damage, chafing and loose connectors
Check the wiring and connectors from the inlet to the charger control module for corrosion, pin tension and moisture
Using the manufacturer's procedure, measure the pilot signal voltage and duty cycle at the vehicle with a known good charge point connected
Test the wiring for continuity, short circuits and high resistance against the wiring diagram
Check for manufacturer service bulletins and software updates for the charging system on that model

How to fix

Clean or replace the damaged or corroded charge inlet, and renew its seals if water has got in
Replace a faulty charging cable or have the charge point repaired or checked by its operator
Repair or replace damaged wiring, and refit or renew corroded connector terminals
Dry out, clean and reseat the charger control module connector, then secure it properly
Replace the on-board charger or charge control module only after wiring, inlet and supply equipment are ruled out
Update the control unit software if the manufacturer lists it as a fix for this fault

Can I keep driving?

Medium severity

The car can usually still be driven, as this fault mainly affects charging. Get it checked soon, and do not keep charging if you notice a burning smell, heat at the plug or visible damage.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.