P2DD2

Code

Generic P — Powertrain

Control Pilot Charging Switch B Intermittent/Erratic

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 59 RU: 23

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Read and record freeze frame and all stored charging/CP-related DTCs
Attempt to reproduce fault with same EVSE and with a known-good EVSE/cable
Visual inspection of charging inlet, cable connectors and CP wiring for damage/corrosion
Wiggle-test wiring harness and connectors while monitoring DTCs and CP signal
Back-probe CP circuit and monitor waveform with oscilloscope during charging attempt
Check continuity and resistance of CP switch circuit (with power off) and inspect grounds

Control pilot typically uses a modulated signal (PWM) where duty cycle represents allowable charge current; waveform should be a stable square wave around expected amplitude
Expected frequency is typically near 1 kHz (implementation dependent) with consistent duty cycle when charging
No frequent dropouts, unexpected level shifts, or high-frequency noise on the CP line
Switch B should provide a stable logic-level change when commanded; resistance to ground should be stable when switch is activated
If measuring with a multimeter, intermittent faults may not appear — use an oscilloscope or DSO to observe transient behavior

Retrieve all related DTCs and freeze-frame data. Note charge session conditions when fault set (EVSE type, cable, ambient).
Clear DTCs and attempt to reproduce with the original EVSE/cable. If fault returns, proceed.
Swap to a known-good EVSE and cable. If issue stops, suspect external equipment (EVSE/cable).
Visually inspect inlet, cable ends and connectors for corrosion, bent pins, moisture, or contamination.
With safe procedures, back-probe the CP circuit and monitor waveform with an oscilloscope during a charging attempt. Look for dropouts, excessive noise, or irregular duty cycle.
Perform wiggle tests of harness and connector while monitoring waveform/DTCs to locate intermittent wiring faults.
With power off, check continuity and resistance of CP switch B circuit, and check for unintended shorts to battery, chassis or other circuits.
Inspect charging control module/ECU connectors and PCB for loose solder joints, cracked components or water damage; re-seat connectors.
If wiring and connectors are good and external EVSE ruled out, consider replacing the control pilot switch assembly or the charging control module per manufacturer guidance.
After repairs, clear codes and perform multiple charge cycles to verify permanent repair. Update ECU/charger software if an update addresses similar faults.