Disconnect and Reconnect the Battery

Reviewed by the Service Reset editor · Updated August 9, 2026 · How we verify
Quick referenceTools10 mm spannerTime~15 minMethodDisconnect negative terminal first

These instructions apply to the Jaguar E-Pace Mk1 (X540) 2017-Present.
For other models, please choose your vehicle here.

The 12 V battery on the Jaguar E-Pace (2017–present) is awkward to reach — it’s low in the engine bay, behind heat shields, and you typically need to raise the car to get at it. Here’s where it is, the must-do steps first, and the mild-hybrid caution.

Jaguar E-Pace Mk1 — the vehicle covered in this guide.
Jaguar E-Pace Mk1. Photo by Damian B Oh via Wikimedia Commons, licensed CC BY-SA 4.0.

Find the Battery and Prepare

The 12 V battery sits low in the engine bay, under covers and heat shields — reaching it usually means raising the vehicle. The under-bonnet jump terminals are separate.

  1. Put the gear selector in ‘P’ and release the electronic parking brake (it needs power to release — do it first).
  2. Turn the ignition off and check all the doors unlock so you’re not locked out.
  3. Keep keyless fobs away from the car, then raise the vehicle, remove the covers and heat shields, and remove the battery cover.
  4. Disconnect the BMS connector, then the negative (−) earth first, then the positive.

Mild-hybrid (MHEV) models: the 48 V system must be deactivated first — a workshop step. Never touch the orange 48 V cabling. Working near airbags? Allow a minute or two before starting.

Reconnecting

  1. Reconnect positive, then the negative earth, and the BMS connector; refit the covers and heat shields.
  2. Switch on and re-initialise the power windows (one-touch is lost); re-enter the clock and settings.

Fitting a new battery? The BMS ideally needs registering with Jaguar equipment so it charges correctly — often why stop/start stays inactive for a while afterwards.

If Something Isn’t Right Afterwards

  • Windows won’t auto-close — run the window re-initialisation.
  • Warning lights usually clear after a short drive; a persistent one stores a code (decode on autodtcs.com).

Frequently Asked Questions

Where is the battery on a Jaguar E-Pace?

Low in the engine bay behind covers and heat shields — you usually raise the car to reach it.

Why release the parking brake first?

The electronic parking brake needs power to release — do it before disconnecting so the car isn’t stuck braked.

What about the 48V battery?

On mild-hybrid models it’s separate and must be deactivated by a workshop — never touch the orange cabling. You only service the 12 V.

Which terminal first?

Negative (−) earth off first, reconnect it last.

If a warning light stays on after reconnecting, look up the code on autodtcs.com.

Independent guide — not affiliated with Jaguar. Always follow your official service manual and safety precautions. Read our full disclaimer.

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