Crank No Start

My truck cranks but no start. Does not do this all the time.

 

We're gonna need a little more info than that. It's probably the battery.

 

Model year of truck?

 

I'm sorry its s 2014 Tundra. When it don't start the immobilizer light is on. I can put the key un the ignition if it is not going to start the light will be on. Then when light is off it will start.

 

I had a 2010 that did that. The chip in the key was eff'd. New key took care of it.

 

Thanks that's what I'll try next.

 

Yep. If the truck's anti-theft system doesn't get "the ping" from the key (or fob) then it defaults to the-truck-is-being-stolen mode and cuts spark. Craaaaaank craaaaaaank craaaaaaaank----no fire. Anti-theft system stepping in.

 

Could it be the immobilizer going bad?

 

Sure, that's a possibility. But I would think it is much more likely to be key related. Have you swapped in a new key battery?

 

The battery us reading 12.4 volts so it should be good.

 

My bad! My key dosen't have a battery