Preserve the fault context without entering the high-voltage system
A failed charge can originate in the vehicle, connector, charger, network or site supply. Where safe, record the warning, time, operating conditions and charge-session details with the vehicle and charger identities. That context helps qualified support separate the possible causes.
Damaged or unsafe equipment requires the OEM emergency response. Do not open the battery, probe high-voltage circuits or clear a warning simply to restore service. A fault record supports diagnosis; it does not authorize repair.
Assign the evidence to the responsible service team
UNECE R100 addresses relevant electric-powertrain and battery safety where adopted. A reference to the regulation does not establish approval of an individual truck or permission for unqualified service work.
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| Decision | What to establish | Condition or limit |
|---|---|---|
| Immediate safety | Follow OEM isolation, parking and emergency instructions for the observed condition. | Do not touch, move or charge a damaged vehicle without authorization. |
| Fault context | Capture codes and conditions before clearing or disconnecting where safe. | A cleared warning can remove evidence without correcting the cause. |
| System split | Test vehicle, connector, charger, communication and site power through approved methods. | One successful charger session does not identify every intermittent fault. |
| Return to service | Require documented repair, inspection and approved verification. | Charging once after reset is not necessarily a complete safety release. |
Hand over identities, warnings and session records
Use the supplier’s service channel and retain the reported symptoms and subsequent instructions. Have qualified personnel decide whether the vehicle, charging equipment or site needs intervention and document release back to service.
Information to send with the service request
- Vehicle, battery and software identity
- State of charge, warnings and diagnostic codes
- Charger, cable, connector and site-power details
- Charge-session start, stop and interruption record
- Ambient, battery and recent damage conditions
- Qualified isolation, repair and return-to-service process
Records to request and keep
- Vehicle, battery and software identity record
- Fault-code and charge-session capture
- Qualified isolation and diagnostic report
- Repair, verification and return-to-service approval
Common mistakes and what to check instead
- Clearing codes before capture: Preserve the fault and operating context for qualified diagnosis.
- Assuming the charger is faulty: Separate vehicle, connector, charger, network and site power.
- Opening the battery for inspection: Use only trained, authorized high-voltage service and OEM procedures.
Service and safety limits
This page is not a high-voltage diagnostic, repair or emergency-response procedure.
Qualified EV technicians, OEM instructions and applicable approval rules control service.
Remove the vehicle or charger from service for damage, overheating, smoke, water exposure, insulation fault, exposed conductors or unresolved safety codes.
Sources and applicability
Controls the project-input, quotation, approval and inspection workflow described in this guide.
Provides public checklists and worksheets; the signed project documents remain controlling.
Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Primary public guidance supporting route, dwell-time, charging-plan, procurement and infrastructure inputs. U.S. programs and examples are not global requirements.
Primary international regulation reference for electric-powertrain and rechargeable-energy-storage safety where adopted. Applicability and approval status must be confirmed for the vehicle and destination.