1998 Dodge Ram 2500 Show Asked by in Gardnerville, NV on February 01, 2009 I have a 1998 ram 2500 the speedometer doesn't work until the truck hits 25 mph and the abs and brake light are on I've been told by two different dodge mechanics, that it is my speed sensor, when I ask them how to replace it, I dont get a staight answer because they want to get paid , I am relatively mech incline and have toolsto perform the job, I just dont know where to find the sensor or how to replace it. please help, Im just a poor public servant and cant afford to pay the ridiculous shop prices 3 replies Report The Vehicle Speed sensor is located on top of the differential housing. it is held in with one bolt and takes about 15 minutes to change. Part #56028 187AC. Always have the dealership check and verify for the latest updated part number.
REMOVAL: Raise vehicle on hoist. Remove brake line mounting nut and remove the brake line from the sensor stud. Remove mounting stud from the sensor and shield Rear Speed Sensor Mounting . Remove sensor and shield from differential housing. INSTALLATION: Connect harness to sensor. Be sure seal is securely in place between sensor and wiring connector. Install O-ring on sensor (if removed) Insert sensor in differential housing. Install sensor shield. Install the sensor mounting stud and tighten to
24 N·m (18 ft. lbs.). I also have a 1998 dodge ram 2500 and the same thing happened to me and all I had to do is replace the abs sensor that is located at the rear axle. It is not your speed sensor trust me it is way cheaper. What if your abs light is flashing and your speedometer is off by 10-20 mph? i also have the same problem with speedometer i was told it had no vss single witch is on left side of trany so i change it still no speedometer i then change speedometer not it so i got a book started look for the problem well i havent fix it but do know what happen there should be 5 volts at vss on trany book says check vss wire at computer should have 5 volts replace computer if no volt if it has 5 volts at computer check wire from computer to vss on trany for broken wire dont know if this will help but check for the 5 volts at vss vss is a two wire pulg left side of trany just in front off transfer 4 wheel drive or end of trany case 2 wheel drive if you have 5 volts at vss change vss i well let you know what i find out about mine when i get it working 2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Output Speed Sensor Location Professional Thread Starter Join Date: Jul 2006 Location: California Posts: 100 Likes: 0 Received 0 Likes on 0 Posts Recieved a P0720 from the machine and need to replace the Output Low Speed Sensor. However I have the service manual and the Heynes Manual but can't make heads or tails of the location of it. Both the Haynes and the ServiceManual have the exact same picture. Any help would be appreciative. Join Date: Jul 2007 Location: DFW, Texas Posts: 7,843 Likes: 0 There's a speed sensor on the top of the rear differential, isthat the one your looking for? I believe there's also one in the tranny but I am unsure whether or not you would need to pull the pan to get at it. Professional Thread Starter Join Date: Jul 2006 Location: California Posts: 100 Likes: 0 Received 0 Likes on 0 Posts Well I purchased the Output Speed Sensor from AutoZone (Part Number SU394) but I think this is incorrect part. I need to replace the Output Speed Sensor for the tranny (Pulling from error code P0720). But I think that is the incorrect part. I can't find that part anywhere under the truck or on the tranny.
Join Date: Mar 2004 Location: Bremen, GA. Posts: 2,703 Likes: 0 Received 1 Like on 1 Post The speed sensor is located in the overdrive gear case. The sensor is positioned over the park gear and monitors transmission output shaft rotating speed [IMG]local://upfiles/2784/7F4B321A1DD24BA8A07FAA160FF1D816.gif[/IMG] Professional Thread Starter Join Date: Jul 2006 Location: California Posts: 100 Likes: 0 Received 0 Likes on 0 Posts Well that was it. I replaced the sensor, erased thecodeand the problem is now gone. Thank You Join Date: May 2008 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts hi there i am having the same error code on my
truck. The check engine light came on the other day and the truck was acting weird so i had the code pulled today and it is p0720. the symptoms i have notcied are when im at a complete stop and the vec. is in gear (drive, reverse) the speedo reads twenty ish km. When im coming to a stop the spedo will drop down to zero but once i've reached a full stop it bounces back to twenty, when i start to accelerate from a stop the speedo instantly drops to zero and goes up as i increase speed, seems to be
working properly. If I put the truck in park the speedo drops to zero but if i depress the bake pedle while in park it sits at about twenty again. The other symptom is if I have my foot on the brake and im at a stop and I shift into neutral i can hear a clicking noise (and kinda feal it in the pedle) it clicks about 10 times then stops, once i shift back into drive it does the same thing, about ten clicks. The truck also seems to be late shifting. I do not have abs in this truck. Any suggestions
would be great, is there any way to acutaly test the output speed sensor? How about the entire circuit? The clicking noise makes me think possibly a solenoid if there is one in the circuit. thanks in advance -dan Join Date: May 2008 Posts: 4 Likes: 0 Received 0 Likes on 0 Posts sorry forgot to mention the truck is a 1999 dodge ram 1500 Laramie slt 4x4 with a 5.9l engine, no abs. thanks again -dan Professional Thread Starter Join Date: Jul 2006 Location: California Posts: 100 Likes: 0 Received 0 Likes on 0 Posts Well the P0720 Error Speed Sensor is only $20 and it takes about 3 minutes to replace with a standard cresent wrench. Is that the only code that the computer is spitting out for you. Not sure if you have a Kragen near you but here is the piece that I fixed to fixed my P0720 error. http://www.partsamerica.com/ProductD...79&PTSet=A That part is assuming that you have the same tranny as I do (46RE) At one time I had a similar issue where my speedometer wouldn't register until 15-20 MPH and it turned out to be the vehicle speed sensor on top of the rear differential. It is about $45 and takes a 1/2 socket and about a 5 minutes to replace. However at that time, my check engine light was NOT on (my ABS light was). I have ABS in my truck but here is the sensor for a NON-ABS truck. Have you checked the fluid level in yout tranny? When was the last time you changed the fluid and filter? Join Date: Apr 2008 Posts: 3 Likes: 0 Received 0 Likes on 0 Posts Quote: Originally Posted by Parts/Service The speed sensor is located in the overdrive gear case. The sensor is positioned over the park gear and monitors transmission output shaft rotating speed [IMG]local://upfiles/2784/7F4B321A1DD24BA8A07FAA160FF1D816.gif[/IMG] Is it possable for somebode to post a pict?? Join Date: Jun 2010 Posts: 2 Likes: 0 Received 0 Likes on 0 Posts This is a 1999 Dodge Ram 1500 5.2L V8 This is the sensor in the rear, but its not the output speed sensor. On the transmission next to the U-joint/drive shaft is the output speed sensor. Is is located on the drivers side facing down. The Wires to this device as listed in the manual are LightGreen/Black stripe & DarlBlue/Black stripe.
What are the symptoms of a faulty speed sensor?5 Common Bad Speed Sensor Symptoms. Transmission problems. ... . Erratic speedometer readings. ... . Inability to engage cruise control. ... . Lack of torque converter clutch application. ... . Check Engine Light is triggered. ... . An internal electrical fault in the speed sensor. ... . Damage on the sensor itself. ... . Poor vehicle maintenance.. Where is the speed sensor located on a 98 Dodge Ram?The Vehicle Speed sensor is located on top of the differential housing. it is held in with one bolt and takes about 15 minutes to change.
Which speed sensor controls the transmission?A car has two speed sensors: the ISS and the OSS, working together to show the transmission data to the car's powertrain module. The ISS sensor monitors the input shaft's speed. If these sensors get misaligned, the operation of the transmission system will be affected.
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1999 dodge ram 2500 speed sensor location
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