Ground continuity fail at dispenser

How it presents

Display

Ground continuity fail at dispenser

OCPP

Faulted (StatusNotification) — capture errorCode/info

Symptom

Ground continuity fail at dispenser on protocol: CSMS StatusNotification + connector LEDs shows GND-01. Techs see session abort or stall Unavailable until the ranked cause is cleared. Correlate OCPP websocket / SECC / vehicle logs as applicable before opening the cabinet.

Root causes (by observed frequency)

1. #1 Moisture or contamination bridging ground-fault sensing on GND-01

   Rain, wash-down, or failed cable boot seals rank highest on outdoor DCFC

2. #2 True equipment ground path open or high-impedance bond at pedestal
3. #3 Nuisance trip from EMI / filter aging after power-module work

Diagnostic procedure

1. 1. Capture CSMS StatusNotification + connector LEDs message for GND-01, connector ID, and last successful session time

   Expected: Exact display string + OCPP status/errorInfo if present

   Tools: phone photos (scrubbed), CSMS

2. 2. Pull OCPP websocket / SECC / vehicle logs as applicable; confirm whether Ground continuity fail at dispenser follows one gun, one cabinet, or the whole site

   Expected: Fault correlates to one path

   Tools: CSMS export, OEM cloud

3. 3. On hardware, isolate power quality / protective devices before opening HV for GND-01

   Expected: Voltage in band; no unexpected trips

   Tools: DMM, IR gun, LOTO kit

4. 4. Execute rank-1 cause check for “Ground continuity fail at dispenser”; swap known-good cable/gun or stall if available

   Expected: Fault moves with cable or stays with cabinet

   Tools: known-good cable, IR, OEM service menu

5. 5. If unresolved, escalate with GND-01 evidence pack (HMI photo, OCPP snippet, readings) — Stay OEM-agnostic until the protocol stage pins a hardware path

   Tools: ticket template

The fix

Clear GND-01 (Ground continuity fail at dispenser) by correcting the ranked cause on protocol, then run a full validation session.

• Suspect module or controller indicated by rank-1 cause

  OEM protocol service channel; keep serial for RMA

  GND-01

1. LOTO and verify zero energy per protocol HV procedure before any bus work
2. Correct rank-1 cause for GND-01; do not shotgun-replace modules
3. Clear fault latches in HMI/CSMS; confirm StatusNotification returns to Available/Preparing as appropriate
4. Run validation: authorize → handshake → ≥5 minutes energy → clean stop; capture MeterValues
5. Document firmware, part lots, and scrubbed HMI photos for confirmations