1999 LS

Need help. 1999 LS1 received new PCM. Hooked it up and and plugged in battery. Tried the relearn procedure but it never got pass step two. TURNED key to start position for three seconds then run position. Security light stayed on. no flashing. Then it went out after a few seconds . It's supposed to stay on or flash for ten minutes. After two day's iam lost. The car turns over and has fuel pressure but no fire to coil packs. Any info would be appreciated.

B52bombardier1

Where did you get your PCM? Was it flashed with a new operating system that is compatible with your vehicle? Sounds like the Vehicle Anti Theft System (VATS) is still enabled.

Rick

Z28SteveA4

iTrader: (16)

You have to do some type of program to the pcm with GM programming or I guess someone with hp tuners. Then vats learn either with GM programming the vats system or the 30 minute learn

1999 LS

Sent in the vin# They flashed it to the vin. Called the # and he told me there was a problem from my ignition key to my pcm. Couldn't go no deeper in the subject. He spent 35 minutes trying to help.

1999 LS

Sorry men& women forgot to mention New key and chip reprogrammed to the BCM. New to site Thanks