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2018 Range Rover Velar Battery Draining Overnight - Parasitic Draw?

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Sarah K. · rep 0 · May 25, 4:44 AM · 1 replies · solved · Question

Vehicle: 2018 Land Rover Range Rover Velar R-Dynamic S

Hey everyone,

I'm having a super frustrating issue with my 2018 Range Rover Velar R-Dynamic S. The battery keeps dying overnight, almost every single night. I've already replaced the battery with a brand new one, thinking that was the problem, but it's still happening.

I've checked to make sure all lights are off, doors are closed properly, and nothing obvious is left on. It feels like something is constantly drawing power, even when the car is off. Has anyone experienced this with their Velar or other Land Rover models?

Any ideas on where to start looking? I'm worried about getting stranded, and constantly jump-starting isn't good for the new battery.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:44 AM

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ClearTheCode admin answer:

Battery drain, often called a parasitic draw, is a common issue that can be tricky to diagnose. It means something is consuming power even when the vehicle is off and locked.

Here's how to approach this problem:

  1. Check for Obvious Culprits First: Before diving into complex diagnostics, double-check simple things. Ensure the glove box light, trunk light, vanity mirror lights, and any aftermarket accessories (dash cams, chargers) are truly turning off. Sometimes a faulty door latch sensor can keep a light on or a module awake.
  2. Perform a Parasitic Draw Test:
    • Connect a multimeter in series between the negative battery terminal and the negative battery cable. Ensure all doors are closed, the vehicle is locked, and the key is far away.
    • Wait at least 30-60 minutes for all vehicle modules to 'sleep.' The initial draw might be high but should drop significantly (ideally below 50mA, though some modern luxury vehicles can be slightly higher, around 80mA).
    • If the draw is high, start pulling fuses one by one from both the under-hood and interior fuse boxes while monitoring the multimeter. When the amperage drops, you've found the circuit responsible.
  3. Common Land Rover Draw Sources:
    • Infotainment/Navigation Modules: These can sometimes fail to power down correctly.
    • HVAC Blower Motor Resistor: A faulty resistor can keep the blower motor partially active.
    • Door Lock Actuators: A stuck or faulty actuator can prevent the vehicle from fully sleeping.
    • Alternator Diode Failure: A failing diode in the alternator can allow current to flow from the battery to the alternator, draining it. This often won't trigger a charging fault immediately.
    • Aftermarket Accessories: Always a suspect if recently installed.

When to See a Shop: If you're uncomfortable performing electrical tests, or if you've identified a circuit but can't pinpoint the exact component, it's best to take your Velar to a qualified Land Rover specialist. They have advanced diagnostic tools (like a thermal imager to find warm components) and wiring diagrams to quickly isolate the fault. A persistent draw can shorten battery life and potentially damage other electrical components.

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