Question about 2005 Buick Rendezvous

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My tachometer works some of the time and the speedometer sometimes reads incorrectly

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Instrument cluster are very bad about going out.without being able to check and make sure that the correct module is sending the information to the cluster it is just guessing.You must have it checked with a tech 2 to be 100 % sure but they go out ALOT.

Posted on Jul 30, 2009

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Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Rendezvous instrument cluster repair

Posted on Oct 07, 2010

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1 Answer

Sppeedometer works intermittantly


If the vehicle speed sensor was the cause you would have a check engine light and the transmission would have sifting issues into overdrive, I would think you just have a failing tachometer stepper motor (tiny DC motor) that drives the needle..

Sep 04, 2012 | 1997 Acura CL

1 Answer

My Tachometer works ,but my speedometer doesnt ? In mornings when cold it hesitates and misses, once it warms up it does great. Why ?


The hesitates and misses is probably a chock problem, especially since when it warms up, it does great.

Since you weren't very specific on your indications, I thought a general troubleshooting guide might be helpful to you. But you might want to look on ebay for a shop maintenance manual for your vehicle if you plan on keeping it for awhile and doing your own maintenance.

This answer is applicable for many BMWs in addition to the one listed below.

Q

The tach and speedo work most of the time, but sometimes work sporadically.


A
Here is a write-up on the initial steps in tracking down a speedometer and/or tachometer problem.
Applies to: E23, E24, E28, E30, E32, E34 with speed sensor units mounted in the differential housing cover.

1) Speedometer - The speed sensor may be faulty. The sensor is mounted in the differential cover. Remove the harness plug and remove the sensor. Clean the sensor and measure the resistance (should be 0.0 Ohms). If there is any resistance higher than 0.0 (zero Ohms), replace the sensor. If the resistance reads correct, reinstall the sensor.

2) The wiring at the connector plug for the speed sensor (in the differential housing) may be faulty and corroded .... pull the boot back from the plug housing and inspect the wires and the pins.

3) The actual speedometer and/or tachometer head may be faulty. It may have a loose connection within it or a cracked circuit board.

4) The speedometer or tachometer head may be loose on the main instrument circuit board (do the gauges change or move if you smack the top of the dash, above the gauges?). Remove the instrument cluster and check the mounting of the speedometer/tachometer to the circuit board. See the attached issues of our Fast Times newsletter for assistance in removing the instrument cluster, on E30 3-series models (see the articles on replacing the PC board and replacing the odometer gears for info on the removal of the instrument cluster).

Fall 2005 Fast Times Winter 2004/2005 Fast Times
DIY E30 PC Boards DIY Odometer Repair

2005_n405_newsletter.gif 2005_n105_newsletter.gif

5) The plug that carries the impulse signal into the instrument cluster may have loose contacts. The plug for the speedometer signal is located on the driver's side of the back of the instrument cluster (on the E30 chassis). If you remove the lower dash trim panel (the one above the driver's knees), you can reach up and touch the plug. It is in a vertical position and has up to 26 wires in it. If you wiggle the plug, while driving, and the speedo comes & goes, you have loose contacts in the plug connection.

6) You may have a problem with the service interval PC board and it's NiCad batteries. If your oil change and service interval lights can not be reset (or will not stay reset for an appropriate time period), the PC board is likely faulty. This can affect the various gauges, including the speedometer and tachometer. If the PC board is faulty, I would suggest replacing it (after checking the other areas noted above). See the attached Fast Times newsletter article on replacing the service interval PC board.

In your specific case, I would suspect that you need to replace the service interval PC-board, if your service reminder lights can not be reset or do not stay reset.

Jun 02, 2011 | 1997 BMW 7 Series

1 Answer

Tachometer stopped working then the speedometer now the service engine comes on randomly and there is a strange noise when starting the blazer and sometimes it almost seems as though it is not going to...


The speedometer and tachometer problem on your Trailblazer instrument cluster is very common on the 03-06 models. It's caused by failing stepper motors on the cluster's circuit board and can be fixed. Check out this page for more on how to get it fixed - Trailblazer tachometer problems

Sep 18, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

2000 ford winstar- speedometer,tachometer started to move crazy,then the tachometer dropped to zewro and hasnot worked since,but the speedometer works sometimes,and acts crazy sometimes. How does the...


Same exact issue with 99 Windstar...is it the alternator, contacts in cluster or what. Checked the fuse and all was good. Anyone have any ideas?

Aug 16, 2010 | 2000 Ford Windstar

2 Answers

Car speedo & odometer sometimes work OK, other times not at all.


Most likely a speed sensor is going bad (most cars and truck do not use mechanical speedometer cables anymore) most sensors are located near the differential in rwd cars or near the drive shaft on the transmission. Best bet is to get a Haynes manual for your car to help locate the speed sensor. Remove it and take it to the auto parts store so you can visually compare it to the replacement. Install the new speed sensor and it should restore your speedometer and odometer.

Aug 19, 2009 | 1996 Honda Civic

1 Answer

My tach and speed dont read right


Common issue with the 05 Mustang instrument clusters, it's caused by failing stepper motors on the cluster's circuit board. It can be repaired, check out this page for more on how to get it fixed - 05 mustang tachometer doesn't work

Jul 12, 2009 | 2005 Ford Mustang

3 Answers

Both speedometer & tachometer not working, both reading wrong.


There was a recent class action law suit settled with GM for this exact problem. You can google gm speedometer lawsuit and get lots of information. Unforutunately for most people I think the warranty was limited to 7 years and 70,000 miles. Which isn't a lot of miles for most people.

If you car isn't covered by the warranty there is a way to "reset" the speedometer.

You can turn the ignition slowly like you are going to start the engine. There is a very small "dead" space where you will see your guage lights go off.

What you want to do is cycle the ignition switch from off to that dead space. Each time you do it your stuck speedometer will move towards zero about 10 mph. So if its stuck on 40 you will have to cycle it at least 4 times.

At first you will probably actually hit the ignition and the engine will try to start.....just release it and try it again.

I know this because I have a 04 avalanche with 80,0000 miles and it has this problem about twice a month.

Jun 02, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Speedometer and tachometer not working My tach only works sometimes. It never seems to lower in rpm when I slow down, but it continues to increase as I speed up. Could the problem be the speed sensor?


This is a tricky one. You have two sensors for your speedometer and tachometer, if one is malfunctioning then both will. Check and replace if necessary, good luck

May 04, 2009 | 1995 Nissan 240SX

5 Answers

Both speedometer & tachometer not working, both reading wrong.


"The Fix" works...I would have not believed it untill I did it.... Start the car in reverse and about 5 times later it reset the speedometer back to zero.....wow!

Mar 25, 2009 | 2004 Chevrolet TrailBlazer

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