GMC Troubleshooting Questions? Ask a Mechanic for Answers
I am sorry for the long wait
this is the stock key less entry system in this truck and stock remotes that came with the truck ?
and BOTH remotes will not work ?
so the truck will not physically crank over at all ?
this truck has 2 theft systems so to say
one does not allow the truck to start up it will crank over physically and not fire up
and the other will blink the lights and beep the horn but should still physically crank over the engine and start up
this sounds like we have more of an issue than the remote not working
if you connect jumper cables or remove and have the battery tested for volts and for cold cranking amps and for bad cells will the battery test out good for those things ?
did this problem happen out of the blue one day ?
no matter which theft system is activated that engine should still physically crank over
if that battery tests good can you put your fingers on the relay called STARTER in the under hood fuse box and do you feel that relay click with your fingers every time the key is held to the crank position ?
if not this issue is going to come down to a bad BCM which activates the horn and the blinking lights in that 1 theft mode and gets the signal from the ignition switch that you are trying to crank the engine and then will tell the ECM to activate the starter relay
again neither theft system should stop this engine from physically cranking over
all of those things are controlled by the BCM
can you remove and have the battery tested ?
pass lock will only shut off the fuel injectors it will NOT stop the engine from physically cranking over
it is located as seen here
but if replaced it must be programmed with a programming scan tool and the programming from a computer into the scan tool to your trucks VIN number
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