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Old 04-14-2018, 07:30 PM   #1
4x4k30
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vats problem 99 gmc

my son has a 99 gmc k1500 with a 5.3 the vats will not let it start and we found out that one of the 3 wires that are rite above the key switch is broken loose we have done tried every thing that we know and I was wondering is there any way to bypass the vats with that wire broken ?
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Old 04-14-2018, 10:59 PM   #2
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Re: vats problem 99 gmc

You could send the PCM to a tuner to have the VATS deleted. This is often done when modifying the tune for a stand alone operation.
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Old 04-15-2018, 05:11 AM   #3
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Re: vats problem 99 gmc

If you google GM vats bypass you should find several threads explaining it. It's pretty common on the cadillac forum. You just buy a certain resister and wire it in.
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Old 04-15-2018, 09:26 AM   #4
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Re: vats problem 99 gmc

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Originally Posted by cadillac_al View Post
If you google GM vats bypass you should find several threads explaining it. It's pretty common on the cadillac forum. You just buy a certain resister and wire it in.
we have done tried most everything the problem is its his only ride to work. I watched a bunch of youtube videos but none show what to do when one them little wires on top of the key switch is broken off rite and the 3 prong plastic connection .I guess the only to do is too get the ecm reprogramed and find another steering colum and swap it in .
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Old 04-15-2018, 10:48 PM   #5
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Re: vats problem 99 gmc

If you know for certain that the broken wire is the problem, can you possibly locate a connector in the salvage yard, cut the old one off and resolder it in?

You might also be able to remove the pin from the connector and resolder the wire to it. I did that on my nephews Impala shift solenoid.
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Old 04-16-2018, 11:11 PM   #6
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Re: vats problem 99 gmc

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If you know for certain that the broken wire is the problem, can you possibly locate a connector in the salvage yard, cut the old one off and resolder it in?

You might also be able to remove the pin from the connector and resolder the wire to it. I did that on my nephews Impala shift solenoid.
I tried another 3 wire pigtail and it still will not run
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Old 04-16-2018, 11:21 PM   #7
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Re: vats problem 99 gmc

Are you sure it is the VATS that is keeping the truck from running?
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Old 04-16-2018, 11:21 PM   #8
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Re: vats problem 99 gmc

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I tried another 3 wire pigtail and it still will not run
You might have to do a passlock relearn after the replacement.



Step 1 – Attempt to start the vehicle. It will crank, but not run. The security light will be flashing on and off. Leave the key in the ‘run’ position for exactly 10 minutes, then the security light will stay solid or go off.

Step 2 – Turn the key to the ‘off’ position for 10 seconds. Attempt to start the vehicle. Some vehicles will run at this point, although many will require you repeat repeat Step 1 two more times. Make sure turn the key to the ‘off’ position for 10 seconds before each 10 minute cycle.

Step 3 – The vehicle is now ready to relearn the proper code. Turn the key ‘off’ for 10 seconds and then ‘crank’ the vehicle. It should be running now. The security light might stay on solid for several minutes afterwards, depending on your system.
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Old 04-16-2018, 11:43 PM   #9
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Re: vats problem 99 gmc

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Are you sure it is the VATS that is keeping the truck from running?
I have check the fuel pressure. I replaced the battery terminals .took out the ecm and looked for any bad connections. I am pretty sure its the vats it will start and die after 3 seconds also I tried the relearn no worky . I will start over in the morning gona try a new battery after that I will send off the ecm and have the vats removed
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Old 04-17-2018, 01:35 PM   #10
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Re: vats problem 99 gmc

Can you get someone with a good scanner(not just a code reader) and get some codes?
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Old 04-17-2018, 09:31 PM   #11
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Re: vats problem 99 gmc

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Can you get someone with a good scanner(not just a code reader) and get some codes?
I took out the ecm and sent it to brendan at lt1 to remove the vats.. I checked the codes it didn't show any but that was a regular code reader.
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