What to know about the Automatic Shutdown Relay:

When you turn the key for your ignition to start, many different things occur. The fuel pump turns on, directing gas from the tank, through the lines, to the injectors. The battery sends voltage to the ignition system, which generates a spark, igniting fuel vapor and starting your engine. However, if the automatic shutdown relay (ASD) is not functioning, none of this will happen.


The automatic shutdown relay controls the power that is supplied to the ignition, the fuel pump, and the injectors, as well as other parts. It is only activated for a few seconds during cranking, and is then turned off. Depending on the make and model in question, the automatic shutdown relay could be situated under the hood, under the dash, or in another position.


As with any other electrical parts, your automatic shutdown relay is subject to wear and tear, and frequent stopping and starting of the engine will aggravate that wear. Eventually, it will fail and you’ll be left with a vehicle that doesn’t crank.


Facts to Note:

The ASD relay is not examined during normal maintenance, and will only be checked during diagnostics for problems with the vehicle not cranking.

Many other problems can cause your engine not to crank, so professional analysis is necessary.

ASD failure is relatively rare, but it does happen.

How to Fix:

The automatic shutdown relay is confirmed to see if it needs to be changed

The faulty automatic shutdown relay is removed

The new automatic shutdown relay is installed

The automatic shutdown relay is tested for operation

The vehicle is tested to ensure proper operation of the automatic shutdown relay

Our Proposal:

Your automatic shutdown relay provides power for some of the most essential systems on your vehicle during ignition. If it fails, your engine will not crank, and it cannot be jumpstarted. If you are experiencing a no start condition, it may be the ASD relay, but it could be another problem. Seek immediate professional diagnosis and replacement by one of your expert mechanics.


Common symptoms indicating you may need to change the Automatic Shutdown Relay:

Engine will not start

Check Engine light is on

Engine starts but stalls and dies

Importance of this service:

Without an operational automatic shutdown relay, your engine will not start, which means your vehicle is not able to move. However, there are many other problems that can create the same symptom, ranging from a dead battery to a damaged battery, or a damaged cable to a failed main relay. If your automatic shutdown relay has failed, you will have to replace it before your vehicle will operate again.