1997 GMC Subburban 1500 loses Tach Speedo and Trans sticks in High Gear. I changed the ignition Starter switch which I read was the problem but problem is intermittant and still exist? AMMCO told me to try changing the Neutral Saftey switch first, but didn't say why?
Did you get this fixed? I'm at the same point with my truck. I thought for sure it was the ignition switch too.
Hi guys, I own the same vehicle and it is not either switch! It is the Anti Theft device. When you Lock you vihicle it goes into theft mode. If you don't unlock it with the remote switch you will see exactly this and the check engine light will come on until 3 starts and cool downs before you can have no codes. IF your vehicle came with a remote switch or Key Chip then this will cure it. You are starting out in Second gear and this will ruin the transmission if you don't attend to it. I am a Master Tech and have changed both switches before I realized the Theft mode problem. Good Luck, this will cure it. PS: you can turn off the Check engine light by disconnecting the battery for 15 minutes.
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