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99 Jeep grand cherokee 4.7 p0500 no speedometer

12K views 16 replies 4 participants last post by  justin 1246 
#1 ·
Hi guys, im trying to figure out where my vehicle speed sensor is. I'm getting mixed answers. People are telling me it's the transmission sensor (input and output shaft sensors). Ive seen the abs sensors at each wheel position. Are those it or are they somewhere else. Id really like to fix this asap so any input would be helpful. Thanks advance guys.
 
#2 ·
Speedometer input comes from the ABS control module. Rear wheel speed sensors are used for the speedometer.
 
#5 · (Edited)
The connectors for the rear wheel speed sensors are hidden under the carpet under the rear seat. Not sure what the resistance should be, but compare the left rear sensor with the right rear sensor.
Best would be to scan the ABS system for faults. Besides speed sensor(s), it could also be the ABS controller or even the PCM. Did you check all fuses first? A blown ABS fuse for example would already cause no speed indiaction.
 
#7 ·
Ok this is what i have no abs codes present i have an INNOVA 3030f that reads abs codes. I unplugged the rear sensors and got abs code 5 and abs code 7 with abs light on plugged back up reset abs light they are not present and its still reading the p0500 is still there and no speedometer??? Im lost. My jeep has a new ecu and tcm
 
#9 ·
Did you change the ECU (PCM) for this problem? The PCM receives the speed info from the ABS controller and than sends it via the PCI data bus to the instrument cluster.
 
#10 ·
No it was due to an issue with it controlling the coil packs and fuel injectors. No start basically. I did just check thru wiring from abs harness to bcm and it was all good the white/ orange wire is a 5v ref to bcm and purple/pink is 12v power to abs ecu they were all good so would b it be a bad abs controller?
 
#14 ·
Ok, thanks for the feedback. How did you discover that the problem was with the ABS controller?
 
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