Allison Transmission Neutral Safety Switch Problems

If you have a bad neutral safety switch it could cause irreversible damage to your engine and or transmission.

Allison transmission neutral safety switch problems.

Some large truck companies may also have the part. Neutral safety backup switch issues are another common allison transmission problem on the gm duramax versions. It developed a problem on route yesterday and would no longer drive the bus. Descriptionone of the most common problems with the allison transmission is failure of the neutral safety back up switch.

That is why you need to recognize the symptoms of a bad neutral safety switch. Here the culprit is often the neutral safety backup switch. You should understand there is a problem if you cannot see the d light up on your gear indicator. The neutral safety switch is a safety device that only allows you to start your engine when the automatic transmission is in either park or neutral.

Buy the switch from one our forum suppoerting vendors list at the bottom or from allison. After jumping across the solenoid and getting the engine started the bus had both forward and reverse movement. Our school has a 2007 ih bus with dt466 and 2500pts allison trans. It is part number 29540479.

The purpose of the neutral safety switch is to prevent the car from starting while in gear which would cause it to launch forward unexpectedly. Some of the symptoms of failure include but are not limited to no start condition gear shift indicator on dash not following properly trans stuck in limp mode or fail safe dtc s set indicating pressure switch codes this switch easily installs with just common hand tools. Yes most likely the nsbu switch is the problem. When i arrived at the bus it would not start due to a suspected neutral safety switch issue.

Common bad neutral safety switch symptoms. Then you will know when to bring your vehicle to a mechanic so that they can replace your faulty switch.