Nearly every EV runs a conventional 12V battery to power the computers that then wake up the high-voltage system. When that 12V dies, even a full traction pack won't get the car to unlock, let alone drive.
We jumpstart from documented 12V points (frunk stud on a Tesla, engine-bay stud on a Leaf, boot terminals on a Kona) and never go near the high-voltage system.
Who calls us for this
Tesla owners locked out on their driveway, Nissan Leaf drivers with a dead dash, and Kona / ID.3 owners after a fortnight away.
What we actually see on these jobs
- Tesla 3/Y frunk access without power: we use the manufacturer's documented low-voltage jump point behind the tow-eye cover.
- Leaf 12V is a conventional small AGM under the bonnet, no different to jumpstarting any other car electrically.
- We can also replace the 12V AGM on the spot if the load-test shows it's finished.
Key facts, Electric cars (12V)
- 12V location
- Frunk on Tesla; under-bonnet or boot on most others
- Typical battery
- 12V AGM 40 to 70Ah
- Symptom
- Car won't unlock, no dash, contactors won't close
- Never
- Attach anything to the orange HV cabling
Electric cars (12V), specific questions
Q.Is it safe to jumpstart an EV?
Yes, from the documented 12V points only. We never touch the high-voltage orange cabling; that's a workshop job with isolation kit.
Q.How do I get into a Tesla with a dead 12V?
There's a low-voltage jump connection behind the tow-eye cover on the front. We use it to wake the car up so the boot/frunk releases normally.
Q.Will jumpstarting my EV void the warranty?
No, provided the correct 12V points are used. That's exactly how the manufacturer expects it to be done roadside.
How the callout works
- 1
One call, one price
Postcode, vehicle and symptom on the phone, you get a fixed price before we set off.
- 2
On-site test
Voltage, load and (where relevant) alternator field test at your location.
- 3
Jumpstart or replace
If it holds, you drive off. If it doesn't, we fit the correct battery from van stock.
- 4
Coded and warrantied
BMS coding included where required, warranty paperwork by email before we leave.
Related guides
General questions
Q.Are you open 24/7?
Yes, genuine 24/7, including nights, weekends and bank holidays, at the same price as daytime. No unsociable-hours surcharge.
Q.Do you charge a callout fee just to look?
No blind callout fee. You get a fixed price on the phone based on your postcode and vehicle before we set off, no surprises at the driveway.
Q.Do you cover the whole West Midlands?
Yes, Birmingham, Wolverhampton, Dudley, Sandwell, Walsall, Solihull and everywhere between, plus surrounding Staffordshire and Worcestershire routinely.
In short
EVs die on the 12V just like everything else, and we know the exact under-cover terminal to use on each model to wake them up safely.