The Auto Stop-Start Relay Hack – Autostop Eliminator

The Relay Hack


  • On the internet, you can find out several ways to hack the auto stop tech on your vehicle, including using a relay.
  • Not only is there a great chance that hacking your car with the relay hack will void your warranty, it can cause functionality issues with other parts of your vehicle.
  • The Autostop Eliminator is a much safer way to permanently disable the auto stop feature without damaging your car or voiding your warranty.


With the relay hack, a relay is used in conjunction with a timer mechanism to simulate a button press by temporarily shorting the signal wire to ground. When the ignition activates, the relay closes. After a fixed time interval, the relay reopens.

The problem with the relay hack is the ignition power is independent of the body control module power. This distinction is important because anytime the ignition is activated after a timer reset but before the body control module reset, the auto start-stop will end up in the wrong state.

Essentially, anytime the ignition is briefly shutoff and then restarted, the state of the auto stop is going to toggle. Nobody wants this behavior. It's just a side effect of poor design.

The only improvement the relay hack makes over the jumper hack is that the disable auto stop button remains functional. However, this hack requires a lot of installation work and technical knowledge. You will need to perform the installation of a relay, install a new wire to the fuse box, soldering, and make modifications to the factory wiring harness. Yep, you heard that right. It requires permanent modifications to the factory wiring harness... and, in the end, it won't even work correctly. All of the money spent on those parts as well as the time spent doing the installation work, just to watch the DIY hack you read online, not work.

The Autostop Eliminator does not use a timer and therefore is not subject to the same shortcomings as other timer-based hacks. Not to mention, the Autostop Eliminator installs without any vehicle modifications which could void a vehicle warranty. It's 100% plug & play!

To learn more about the Auto start stop feature itself, check out our blog page and not only will you find your answer, but you'll have questions answered you didn't even consider!

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