Land Rover Discovery Sport P300e (2020–2026) Unable to Charge – BECM and Contactor Fault
Vehicle unable to charge
Battery warning symbol displayed on the dashboard
High-voltage system unable to operate correctly
The following fault code(s) may be present
U0064-83 - Vehicle communication bus E – value of signal protection calculation incorrect
P0AA0-66 - HV/EV battery positive contactor circuit – signal has too many transitions/events
P0AA7-16 - HV/EV battery voltage isolation sensor circuit – circuit voltage below threshold
P0DA9-62 - HV/EV battery voltage/drive motor B inverter voltage correlation – signal comparison fault
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Parts Repaired/Replaced
- High-voltage battery contactors
- BECM internal relay
- BECM capacitors
- BECM reset and contactor-event counter reset
Affected Vehicles
Land Rover Discovery Sport P300e
- Land Rover Discovery Sport P300e 2020
- Land Rover Discovery Sport P300e 2021
- Land Rover Discovery Sport P300e 2022
- Land Rover Discovery Sport P300e 2023
- Land Rover Discovery Sport P300e 2024
- Land Rover Discovery Sport P300e 2025
- Land Rover Discovery Sport P300e 2026
Common Failure Symptoms
- Vehicle will not charge
- Battery warning symbol appears on the dashboard
- High-voltage system does not come online
- Charging or battery-management faults are stored
Land Rover Discovery Sport Diagnostic Report
Initially, diagnostic testing confirmed faults within the Battery Energy Control Module (BECM) and Battery Charging Control Module. Live data showed the contactor pre-charge opening-event counter at its maximum value. Further investigation identified contactor, communication and isolation-related fault codes, indicating that the BECM and contactor system required attention before the high-voltage system could be fully assessed.
Land Rover Discovery Sport Repairs
The first repair stage addressed the BECM and high-voltage contactor system, following the established repair route used on comparable faults. The BECM required internal work, together with the appropriate resets, while the battery contactors required repair or replacement.
- Repaired the BECM relay and capacitor circuit
- Repaired or replaced the high-voltage battery contactors
- Reset the BECM and contactor-event counters
- Followed up with an isolation test once the high-voltage system was online
Resolution
The investigation established a clear first-stage repair route for the charging failure. The BECM and contactor faults were rectified and the event counters reset before final verification of the high-voltage system. Following the repair:
- Rechecked all BECM and charging-system fault codes
- Confirmed that the high-voltage system came online correctly
- Verified charging operation
- Carried out follow up isolation testing, and confirmed no isolation issues present
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High Voltage System Repairs
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