Bulkhead Workshop › Land Rover models › Land Rover Defender L663 3.0 Ingenium diesel mild hybrid (D200–D350) › Workshop guide › Hybrid system & 12 V battery check

Land Rover Defender L663 3.0 Ingenium diesel mild hybrid (D200–D350): hybrid system & 12 v battery check

Electrical · Defender L663 (2020 on) · 2021 on

How often: every 21,000 mi or 2 yrs, whichever comes first. Mild and plug-in hybrids rely on the 12 V battery and the high-voltage system being healthy; faults show as start-stop or charging problems.

Work safely: support the vehicle on axle stands, never a jack alone; let it cool first. Check figures against your workshop manual. You do this work at your own risk.

Parts

None

Tools

• Diagnostic tool
• Battery tester

Step by step

1. Test the 12 V battery with a proper tester; replace it with the exact type (AGM) and register it with a diagnostic tool.
2. Check for hybrid warnings and stored codes.
3. Plug-in hybrids: check the charging port and cable, and the battery coolant level (high-voltage parts are for trained technicians only).

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