Issues with 06 gmc yukon xl denali

[Chrisnkinna]

First does it have a remote start system? If so disconnect the bypass box. Mine had one and the bypass box was dieing so it would randomly not start at times. Plus check you ground connections under the drivers door inside the running board area there are two. Clean both. Mine were rusted and that cleared some other problems for me.

Once the bypass wire was connected back to stock last summer no odd things. Even was losing power to my windows and door locks.

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No remote start installed. And anti theft "reset" works everytime it doesnt start even tho the security light isnt on

 

[Chrisnkinna]

Does anyone know how to bypass the security system? I'm thinking it may be something to do with that since the "reset works to get it started. When I start down the road it stalls everytime.

 

[Chrisnkinna]

So we have changed crankshaft position sensor, throttle body, drive belts, checked alternator and battery, cleaned all engine grounds, cleaned all electrical connections and still having the hesitation/stalling with acceleration..... any more ideas? Also checked all plugs and wires

 

[Chrisnkinna]

Also removed cats

 

[Doubeleive]

hate to see you keep throwing money at it but it sounds like maybe a bad ignition switch, try starting it up and then smack the steering column and ignition housing area and see if it makes the problem occur, maybe use a rubber mallet. if that doesn't give any results try the same thing with the fuse box under the hood.

 

[Chrisnkinna]

Has a new key switch and lock cylinder too. And have done that with fuse box we dont want to spend anything else til we know for sure