P0E71
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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Common causes
Ordered by how often each turns out to be the cause.
- EVSE PWM above 1 kHz specCommon
- EVSE oscillator driftPossible
Parts involved
- Control Pilot Signal
- Evse
P0E71 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.