Code
P1AF300
BYD
P — Powertrain
DC charger cabinet actively suspends charging
AI status
Completed
Completed
100%
Causes
- Charger cabinet protective trip (overcurrent/overvoltage/overtemperature)
- Pilot/Control Pilot (CP) or proximity (PP) signal abnormality
- Vehicle BMS or charger communication request to suspend (CAN/PLC/ISO 15118)
- Ground/insulation fault detected between HV system and chassis
- Poor connector/cable contact or interlock fault
- Charger firmware or software error
Symptoms
- Charging session terminates early with charger status showing "suspended" or "stopped"
- Vehicle indicates charging interrupted or shows a charging fault message
- Charger displays a fault code or LED indicating protective trip
- Charging current drops to 0 A while connector remains mated
- No voltage present on DC+ / DC- at the connector while transporter handshake occurred
- Intermittent ability to start charging; sometimes works with other chargers
What to check
- Read DTCs from vehicle (BMS, EVSE interface, charging controller) and capture timestamps
- Obtain charger cabinet fault log and status messages for the session time
- Visually inspect DC connector and cable for damage, contamination, bent pins, or water ingress
- Check charger display/LEDs and station breaker status; note any station-level tripped protections
- Measure CP/PP pilot voltages and PWM during attempted session (observe expected states: vehicle present, ventilation, charging request, etc.)
- Measure DC output at connector during attempt (ensure safe HV procedure and PPE)
Signal parameters
- DC output voltage: nominal pack charge voltage range (varies by vehicle); 0 V when suspended
- Charging current: 0 A when suspended; expected charging current when active (vehicle specific)
- Control Pilot (CP) voltage/duty: states for Cable/Vehicle/Charger handshake (typical 0–12 V and PWM duty indicating available current)
- Proximity (PP) resistor value: indicates cable rated current per standard (check expected values)
- Insulation resistance: typically >100 kΩ between HV and chassis when healthy (vehicle-specific limits)
- Charger fault flags/log codes: cabinet-specific status bits for overtemp, overcurrent, insulation, mains loss
Diagnostic algorithm
- Capture event details: exact time, vehicle SOC, ambient and battery temps, charger ID and firmware, and reproduce attempt logs.
- Read and save all DTCs from vehicle BMS, charging controller and EVSE interface modules. Record freeze-frame data if available.
- Retrieve charger cabinet/session logs and note cabinet fault code(s) and protective actions taken.
- Visually inspect the plug, receptacle, and cable for damage, corrosion or foreign material. Clean and repair as necessary.
- Attempt charging on a different known-good DC fast charger. If charging completes, suspect charger-cabinet fault; if it still suspends, suspect vehicle/BMS or cable.
- With HV safety procedures and PPE, measure CP/PP signals during a connection attempt and verify expected voltages and PWM duty cycles for charging state transitions.
- Measure DC output voltage and current during a charging attempt (only by trained personnel following HV protocols). Confirm whether charger ever applies DC voltage.
- Check insulation resistance between HV and chassis on vehicle and on charger input if permitted; any insulation fault may cause suspension.
- Inspect charger cabinet for tripped mains breakers, blown fuses, or internal DC stage faults. Coordinate with station operator/charger manufacturer support if needed.
- If suspect communication (PLC/ISO 15118) loss, monitor CAN/PLC messages during handshake; check cabling and antenna/grounding on charger.
- Update firmware/software on vehicle charging controller and charger cabinet if manufacturer advises; clear DTCs and perform a controlled retest.
- Replace or repair the faulty item identified (cable, connector, charger power stage, BMS module) and confirm normal charge sessions.
Likely causes
- Charger detected overtemperature or internal fault and entered protective suspend
- CP PWM duty cycle or voltage outside expected range caused charger to stop
- Insulation monitoring on the charger or vehicle reported leakage and triggered suspension
- Vehicle BMS issued a suspend request due to high battery temperature or cell fault
- Damaged pins or contamination in the DC fast-charge connector causing loss of pilot/communication
- Charger cabinet lost mains input or its DC output stage failed
Fault status
Status
Charger cabinet has actively suspended the DC charging session — charging stopped by charger/EVSE due to a protective or communication condition.
Repair difficulty: Medium
Diagnostic time: 1.5–4.0 hours
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