Question about 2004 Buick Rendezvous
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Posted on Jan 02, 2017
Your vehicle has the 4T60E transmission,and there is a speed sensor mounted on the transmission case that the vehicle's computer uses to compute vehicle speed,and relay it to the dash mounted speedometer.The best way to diagnose this problem is to first,hook up a scan tool that is available at automotive repair shops,and scan the vehicle for trouble codes first.Your vehicle probably has a stored trouble code along the lines of a Vehicle Speed Sensor (VSS).After pulling codes,go to the data stream on the scan tool and look at the VSS signal that the computer is seeing,and when the speedo acts up,and stops working,look to see if the computer is seeing,a speed signal.If the vehicle computer is seeing a speed signal,then it's probably the speedo in the dash gone bad.If the vehicle computer is not seeing a speed signal,then it is likely a problem with the speed sensor mounted on the transmission,or the wires right before it.So,to diagnose really requires a scan tool,with a data stream,or you could just have the speed sensor replaced,and hope that fixes it.The speed sensor is located on the passenger side of the transmission,only accessible from under the car,but where the pass side axle actually goes into the transmission,the sensor is directly above that point,and retained in the case with a 10 mm bolt.It has two wires going to it.Good luck.
Posted on Aug 06, 2008
It is possible that the connector came off the back of the circuit board behind the speedometer. Do the lights work IN the speedometer and gauges? Could also be that the ground wire loosened up under the dash, usually on the drivers side. Just some suggestions that I thought might help. Best wishes to you.
Posted on Jan 19, 2009
SOURCE: New Century - DashBoard Problems
My 1999 Buick Regal was doing the same sort of thing. Randomly the gauges would go crazy and then the engine would shut down. I ended up replacing the ignition switch. Not exactly where the key goes in, but the switch box behind it on the inside of the column. I had to take off the steering wheel, air bag and everything, but it hasn't had any problems like that since.
Posted on Apr 11, 2009
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