Question about 1999 GMC Jimmy

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My 99 jimmy has a abs light on and the speedo does`nt work, i changed the speed sensor on the diff, but still the same symptoms, are there more than one to deal with? or do you have another suggestion?

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The vehicle speed sensor is located on the tailshaft of the transmission this is the sensor that controls the speedo

Posted on Jun 29, 2009

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99 silverado abs light stays on transmission won't shift from 1st and speedo doesn't work I have replaced all vss sensors and checked fuses and still no luck help please!


for the speedo its going to be a speed sensor and with the ABS light on it will probably be an ABS sensor you'll have to figure out which one.Does the speedo go crazy sometimes or just doesn't work at all

Mar 28, 2014 | Cars & Trucks

1 Answer

1998 dodge Dakota Ok so I just got this truck and when I got it the abs light and brake light were on plus the speedo doesn't work sometimes I replaced the rear speed sense on the diff but the lights...


If the red brake light and the ABS light are both lit up on the dashboard, do NOT drive the vehicle. It indicates a major malfuntion with the brake system. The red light indicates low brake fluid or the parking brake engaged. The yellow ABS without the red light, indicates a problem the computer found and it disables the ABS system while still having conventional brakes. Since both are lit, it needs the brake system repaired. What you replaced on the rear diff was probably the rear ABS sensor. The vehicle speed sensor for the speedometer should be located on the rear of your transfer case if you have 4WD, or on the rear of the trans if you have 2WD.

Oct 11, 2012 | Cars & Trucks

1 Answer

Rover 75 no speedo and abs light on intermittent


the speedo drive is on this wheel the sensor is on top of the diff output driveshaft ,test the abs sensor with a multimeter for continuety and the connector plug,does the roof vibrate on this one or did the robot work ok on that shift when it was built

Apr 25, 2012 | Rover 75 Cars & Trucks

1 Answer

Need Help. My 2005 Dodge Ram has the abs and brake light on, and the speedo is not working. I have changed the speed control sensor on the rear diff and the transmisson 2 times, though maybe I got a bad...


The ABS and BRAKE warning lights are on in the cluster because there is an active fault in the ABS module. The speed sensors that you have replaced are not direct inputs to the instrument cluster. Your truck should have one or possibly two front wheel speed sensors and one speed sensor in the rear diff. These are all direct inputs to the ABS module which are then calculated and sent out on the "bus" communication wire which is read by the cluster. It would be much easier to diagnose this problem by knowing what the active codes are in the ABS module.

Jan 23, 2011 | Dodge Ram Cars & Trucks

1 Answer

My speedometer will not work check engine light goes on and off and the overdrive indicator light flashes. All this happens intermittently with hotter weather it seemingly happens more frequently. Scanned...


code p 0500 is for the vehicle speed sensor (VSS) which works the speedo as well as the ratio changes
code p0720 refers to the output shaft sensor --ECM or transmission control module (TCM)
the vss reports to the tcm which reads the road speed and gear ratio and shifts the appropriate solenoid

May 12, 2017 | Cars & Trucks

2 Answers

Brake light & ABS light on, speedo problem


I recently had the same problem on my 99 dakota R/T. My symptoms included the abs and brake light staying lit, speedo failing to work at all speeds and the truck would occassionally stall when coming to a stop. I ended up replacing the rear abs speed sensor (on top of the rear diff) and all is well now. The truck runs exactly as it should. You are looking at a $30-$35 dollar part.

Aug 19, 2009 | 1998 Dodge Dakota

1 Answer

Speedometer won't work


IT SOUNDS LIKE YOU HAVE BROKEN WIRE LEADING TO SPEED SENSOR IN REAR DIFF..CHECK FOR ANY SPOTS IN HARNESS WHERE IT LOOKS OUT OF PLACE OR RUBBING ON SOMETHING..ALSO CHECK FOR SPREAD CONNECTIONS IN PLUG AT SENSOR..CHECK ALL FUSES RELATED TO ABS SYSTEM IN UNDERHOOD FUSE/RELAY CENTER

May 28, 2009 | 1998 Dodge Dakota

5 Answers

My check engine light is on, my speedometer do not work, my ABS light and Brake light is on. My check engine, ABS and brake lights stay on all the time and my speedo does'nt work.


Speed sensor located in top of rear diff is probably bad, It sends a signal to abs module for abs, it also is used by pcm and cluster for vehicle speed.Sometimes rear diff mechanical problem can damage the sensor. Trans sensors have nothing to do with speedo or abs light.

Aug 03, 2008 | 1999 Dodge Durango

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