Question about 2003 Buick Rendezvous
The speedometer has been fluctuating beween being accurate to going up to the second time around the dial. Sometimes it goes back to normal, then after a week or so slowly goes up higher to way past the end, and won't come back. The odometer is correct and works. I am told that it is in the instument itself, and the entire dash gage unit must be replaced. I thought it was the speed sensor on the trans mission, but am told other wise. Can what I'm told be true? Some how I think it could be repaired. Help
Try to reset the software.
How? Park your car first. put the gear in Park (P). Turn off ignition and take out the key. Next, on the cluster there is a trip switch. Press and hold it. Insert the key and start the engine. If the pointer (needle) goes to the orginal position ( 0 mph), you just reset the cluster. Potentially this will fix the issue you are having. I just saved you a trip to the dealership and $500. But, If the issue goes away for few minutes/hours/days and it comes back again. Most probably the motor (Stepper motor) for the speed gague has gone bad. Replacing it is not that hard, getting the part might be hard. See if you have friend at Delphi. They might be able to tell you the actual part number and supplier. Make sure you replace the exact part number, not the it could be part. The motors are calibrate to work with the software. If the two are not compatiable, the gague might not work properly.
If you can't do it, there is a company in Detroit area that can replace the part for you and they are way cheaper than delearship. Sorry, dealership. This cmpany work with GM engineering. They are called Specmo enterprise www.specmo.com
Posted on Mar 09, 2010
Your car's symptoms are classic signs of a failing stepper motor that controls the speedometer needles movement. And your right, it can definitely be fixed for way less than the replacement cost of the gauge cluster.
I repair these and other GM instrument clusters with this same problem, email me at firstname.lastname@example.org or visit www.drspeedometer.com
Posted on Aug 31, 2010
Turns out this is a common problem for the Rendezvous.
I took it to a mechanic and after he tested to see if all the speed sensors were working with his handheld computer reader, (because there is no speedometer cable anymore) He reset the needle by turning the key about 25 times as far as possible without starting the vehicle. The speedometer needle came back a bit each key turn till it reached zero. It's been working fine since.
Posted on Dec 11, 2009
SOURCE: The speedometer on my 2004
It could be a bad connection in the wires between the speed sensor and the Engine Control Module (ECM). Is the ECM setting a speed sensor code? It could also be a bad Instrument Panel Cluster (IPC) module. Are there any codes in the IPC? It could be a problem with the data line between the ECM and the IPC, in which case you will be getting "U-codes" out of your ECM. (U-codes indicate communication problems between the various modules in your car) A good scan of you vehicle's computer systems would be the best place to start.
Posted on Dec 16, 2010
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