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Speedometer failure


Guest Motu 56

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Guest Motu 56

My son was driving home when the speedometer failed. He was doing appx 50mph when the when the reading from the screen just slowly began to drift to zero. I tried all the settings and no change. Where should I look first? As always your help is greatly appreciated!BTW the odometer is stuck at 38.5. The car is a 90.

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First, look for trouble codes. Next I would bring up the MPH readout from the ECM and see what it said. If zero also then just for S&Gs, I would check the VSS (vehicle speed) sensor connection. If good but other displays are OK then it could be the BCM.

(Speed signal is generated at the VSS then goes to the BCM which develops the digital IP signal and also sends to the ECM - see the VSS error code description in the FSM.

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