Bulkhead Workshop › Land Rover models › Range Rover L405 P400e plug-in hybrid › Workshop guide › Hybrid system & 12 V battery check

Range Rover L405 P400e plug-in hybrid: hybrid system & 12 v battery check

Electrical · Range Rover L405 (2012–21) · 2018–2021

How often: every 16,000 mi or year, 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

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

More Range Rover L405 P400e plug-in hybrid servicing

Service: engine oil & filter every 16,000 mi or year
Pollen (cabin) filter every 16,000 mi or year
Air filter element every 32,000 mi or 2 yrs
Spark plugs every 60,000 mi or 6 yrs
Auxiliary belt & tensioner check every 16,000 mi or year
Coolant change (10-year) every 10 yrs
Brakes, tyres & suspension inspection every 16,000 mi or year
Brake fluid change every 3 yrs
Transfer box & locking-diff oil every 60,000 mi or 5 yrs
Automatic gearbox fluid & differentials every 60,000 mi or 6 yrs
Air suspension check every 16,000 mi or year
Electric parking brake check every 16,000 mi or year
Underbody & corrosion check every year
Annual safety inspection every year
Monthly walk-round checks every month

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