Here's How You Jump Start A Completely Dead Rivian

This video shows you everything you need to know.

Jump starting a dead Rivian.

Photo by: Out of Spec Reviews (YouTube)

Mack Hogan

By: Mack Hogan

Jan 18, at 9:00am ET

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There's a key challenge with some electric vehicles' door handle design. If the door handles pop out electronically, a dead battery can leave you locked out, and unable to open the hood. Without hood access, you probably won't know how to jumpstart a dead low-voltage battery, leaving you locked out.

Here's how you solve that issue, at least if you own a Rivian R1T or R1S. The latest video from Out Of Spec Bits breaks down the process, which is similar to the process for most EVs with pop-out door handles.

In the video, Kyle and Scot from Out Of Spec start with a 2026 Rivian R1S that is completely dead. Both the low- and high-voltage batteries are dead, a worst-case scenario for an EV. Without a functioning 12-volt battery, you often can't engage the charging system on the high-voltage battery. That's why jump-starting the 12-volt battery is the first step.

For most EVs, there is a manual way to get into the cabin or hood. On Gen 2 Rivian R1s, there's no manual way to get in, but there are a pair of wires in the trailer wiring harness that can be used as jump leads. By connecting a jump box or another vehicle's battery to these cables, you can power up the vehicle's low-voltage power system and engage high-voltage charging.

Unfortunately, the video shows that this is all easier said than done. The Rivian requires a consistent 12-volt signal to power up its door handles and screens, and a portable roadside jump-box isn't quite enough. Even a larger lead-acid model isn't enough to get the on-board charger to accept an AC connection and begin charging.

This is where you connect the jump box to a Rivian R1S or R1T.

Photo by: Out of Spec Reviews (YouTube)

To solve that, Out Of Spec jumps the Rivian the old-fashioned way, with a pair of jumper cables and a gas car. The Rivian takes so much load that you can hear the Ford Crown Victoria's engine rev up, but that's enough to get it charging. From there, the DC-to-DC converter handles the rest of the low-voltage charging, while the wall plug and onboard charger juice up the traction battery.

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For most EVs, it won't be this challenging. Modern EV battery systems are designed to keep the 12-volt batteries topped up, and most are easy to jump start when they inevitably expire. Still, if you want to avoid dealing with this, the advice is the same. Always replace your car's 12-volt battery every three to five years, or at least get it tested to ensure it's still strong. You'd hate to walk up one day and find your power door handles tucked away, unable to open.

Contact the author: Mack.Hogan@insideevs.com

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