Ford Electric — 12V Care, Software Currency & Provenance Guide

Why this guide exists

Ford’s two current UK electric models sit at opposite ends of the EV-engineering spectrum — the Mustang Mach-E on a dedicated EV platform (CX727), the Puma Gen-E on an adapted combustion platform — but ownership research on both keeps circling back to the same two things: 12V battery health, and staying current on software/recall campaigns. This guide pulls both themes into one place so you’re not re-reading the same checks twice across two model pages.

Part 1 — 12V battery care

Every EV has two separate battery systems: the high-voltage pack that drives the car, and a conventional 12V battery that wakes the car up, runs the locks, and powers onboard electronics before the high-voltage system engages. A weak or flat 12V battery can leave either Ford EV completely unresponsive even with a fully charged main battery — and on the Mach-E specifically, it’s the root cause of one of the most serious documented issues on this site (see Part 2).

General good practice, both models

• Get the 12V battery load-tested, not just voltage-checked, at every service — a battery can show an acceptable resting voltage and still fail under load.
• If the car will sit unused for more than a week or two, a trickle charger is the simplest prevention.
• A car that won’t wake up, won’t unlock, or shows electrical gremlins (infotainment glitches, warning lights that don’t correspond to an obvious fault) is more often a 12V issue than a high-voltage battery problem — check the cheaper, more common cause first.

Mustang Mach-E specific

If the 12V battery drops below 8.4 volts, affected model years (2021–2025) can lose the power needed for electronic door releases to work — see Part 2 for the full recall detail and the manual override procedure. This is a genuine passenger safety consideration, not just an inconvenience, and is the single most important 12V-related thing to check on this model.

Puma Gen-E specific

Too new for a comparable documented pattern yet, but apply the same general precautions — this is exactly the kind of thing this guide will be updated to reflect as real ownership reports come in.

Part 2 — Recall and software provenance

This is where the two models differ most. The Mach-E has a well-documented, multi-part recall history; the Puma Gen-E doesn’t yet, simply because it’s a much younger model. Treat the difference as a reflection of age, not necessarily of underlying quality — but it does mean the checks below matter far more on a used Mach-E than on a Gen-E.

Mustang Mach-E — what to check on any used example

How to check: log into your account at ford.co.uk to see recall status for your VIN, or call a dealer directly with the VIN in hand. Do this before assuming any symptom is unrelated to a known issue — with this many distinct campaigns on one model, checking first saves a lot of guesswork.

Puma Gen-E — what we know so far

No comparable recall or software-issue pattern has been widely reported yet, as UK deliveries only began in 2025 and the model received a significant battery/software update for the 2026 model year. Worth knowing:

• Confirm whether a used example is pre- or post-2026-update, since this affects both range and available features (BlueCruise) — not a fault, just a genuine specification difference worth knowing at purchase.
• Ford’s other EV (the Mach-E) has had real software-related recalls, which is a reasonable prompt to check for updates as routine practice on the Gen-E too, even without a specific issue to point to yet.
• This section will be updated as real ownership data comes in.

A general principle for Ford EV ownership

Across both models, the pattern is consistent: known issues on Ford’s EVs have tended to be software- or electronics-related rather than mechanical, and Ford has generally addressed them through updates or recalls rather than owners needing to find independent fixes. That’s a reasonably good sign for long-term ownership — but it also means checking current software and recall status is more valuable on a Ford EV than checking, say, fluid levels would be on a combustion car. Make it the first thing you do at every service, and the first thing you check before buying used.

Related pages on this site

• Ford Mustang Mach-E Owners Club → — full known-issues detail and service schedule.
• Ford Puma Gen-E Owners Club → — full known-issues detail and service schedule.
• Ford & Stellantis — Wet Belt, PowerShift & Provenance Guide → — the equivalent guide for Ford’s combustion and PHEV range.
• 12V battery drain: what to check before assuming a fault → — general cross-brand EV guide.
• How to prove full service history when selling →