my 99 gmc jimmy seems to have lost overdrive. the tach revs but the speedometer doesnt move. it will go into reverse.

Asked by Mar 04, 2015 at 10:46 AM about the 1999 GMC Jimmy 4 Dr SLE 4WD SUV

Question type: General

2 Answers

237,165

I always check my fluid first, is it burnt, low? If all is fine, you might have burned up the O/D band. Only way to know is have it diagosed by your mechanic or trans expert.

38,265

You may also have a bad VSS (Vehicle Speed Sensor). If CEL is on, see if it will give you a code. The VSS or Variable Speed Sensor, is an Electrical pulse sensor that sends a signal to the DRAC (Digital Ratio Adapter Control) informing it of the vehicals speed. From there signals are sent to the Power Train Control Module, and to the Cruise Control. If your Speedometer is not working, 99% of the time its caused by a defective VSS. On 2WD models, the VSS is located on the tailshaft of the Transmission, drivers side. On 4WD models, the VSS is located on the tailshaft of the Transfer Case, drivers side. You will need a 1" socket to remove the sensor.

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