Control Pilot Signal Frequency Too High
The control pilot PWM frequency from the EVSE is too high. SAE J1772 requires 1 kHz +/- tolerance. The on-board charger negotiates voltage, current and safety with the EVSE; a fault interrupts charging or limits it to AC slow-charge despite a DC fast charger being attached.
Affected components
- Control pilot signal
- Evse
Common causes
- High likelihood: EVSE PWM above 1 kHz spec
- Medium likelihood: EVSE oscillator drift
Possible symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.