03 chevy tahoe speedo reading high

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=95730
Printed Date: May 12, 2025 at 10:38 AM

Topic: 03 chevy tahoe speedo reading high

Posted By: NismaX
Subject: 03 chevy tahoe speedo reading high
Date Posted: July 18, 2007 at 8:59 PM

Hi

I had one of my customers from a few years back call me regarding their 03 Chevy Tahoe's speedometer. He says it is reading high at times and normal other times. Of course he believes it is the remote starter. I told him I didn't think that could be it. But he told me he spoke to this guy at the dealership about the speedo issue and the first question out of the guy's mouth was "does it have a R/S in it?"

I don't think there is a connection here but with the new databuss stuff it's hard to know what is and what is not connected to it. Has anybody else experienced such a thing with the speedo reading high or is it just the speedo messed up?

Thanks
Jon

Replies:

Posted By: Steven Kephart
Date Posted: July 19, 2007 at 2:23 AM

I've done quite a few remote starts on Chevy's with databus systems (heck, I did one this morning) and have never run into that problem. You can disconnect the tach and data wires to prove it isn't the remote start.

You know, I've ran into wierd instrument cluster issues after a dead battery in those vehicles. After disconnecting the battery for 20 minutes resetting the factory computer, everything started working normally. You may want to try this and see if it fixes the problem.

Posted By: fkelsey
Date Posted: July 19, 2007 at 12:08 PM

I have also run into cluster issues on the Tahoes. One thing I found that the speedo will stop at the speed you are going if you are in a head on collision. It actually hangs on how fast you are going when you go KABOOM. Had a buddy at a local dealership tell me that could be reset but it never seems to work right afterwards. But generally it was like Stephen said it was right after a dead battery and in self check it would hang.

Posted By: Chris Luongo
Date Posted: July 21, 2007 at 1:04 AM

Definitely a known issue on fullsize GM trucks.

One repair service here mentions that there's a 6-week wait for new units:

https://www.aaellc.com/

Also, type these words into google: gm truck speedometer lawsuit..... you'll find some interesting sites there.

Posted By: Chris Luongo
Date Posted: July 21, 2007 at 1:15 AM

Also, maybe print this for your customer if he doesn't believe you:

https://www.topix.net/forum/autos/chevrolet-tahoe/T2BGKBGI55EKNU77C