gauges go nuts
Thread Starter
Instructor
Joined: Sep 2008
Posts: 177
Likes: 25
gauges go nuts
Hi, maybe you can give me a few starting points to investigate (1999, 6 speed, all stock). Last Fall I'd be driving along, hit a bump, and the gas gauge would go to empty, temp to max, oil pressure to 0. Outside temp would stay on, radio would go blank. Passenger window would not go up or down. Speedo would work. DIC would have numerous messages, including "reduced engine power," "service engine soon," the dreaded "ding ding ding", but the engine kept running strong. Hit another bump and all back to normal. Hit another bump . . .
Any suggestions appreciated. Thanks, Larry
Any suggestions appreciated. Thanks, Larry
Safety Car
Joined: Mar 2015
Posts: 3,638
Likes: 245
Hi, maybe you can give me a few starting points to investigate (1999, 6 speed, all stock). Last Fall I'd be driving along, hit a bump, and the gas gauge would go to empty, temp to max, oil pressure to 0. Outside temp would stay on, radio would go blank. Passenger window would not go up or down. Speedo would work. DIC would have numerous messages, including "reduced engine power," "service engine soon," the dreaded "ding ding ding", but the engine kept running strong. Hit another bump and all back to normal. Hit another bump . . .
Any suggestions appreciated. Thanks, Larry
Any suggestions appreciated. Thanks, Larry
Now I read others found the problem in other areas which is possible. Least this can give you a start on where to look.
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,613
Likes: 4,061
From: Cape Coral, Florida
What you’re seeing is what happens when power or ground get on the serial data line which is one wire that allows all the cars modules to communicate with each other...I started to make a YouTube video on how to diagnose this but never finished the video...I actually took 12 volts and put it on the data line and this is exactly what I saw...in my case the car wouldn’t start...all DIC messages, fuel gauge goes to E...water temp maxes out, windows don’t work...when a module loses power or ground that power or ground may backfeed on the data line and that is what happens...as My Vette Life mentioned the issue may be on the drivers side door...the drivers side door module has a 6 wire connector which is under the rubber accordion boot which you’ll see when you open the door...check the connections and if this happens again just shake the boot and see if that issue goes away..if so you found the problem...you can start there !!
Last edited by C5 Diag; May 3, 2020 at 07:50 AM.
