Speedometer does not work

1991 DODGE RAM

DAVIDFLYNN

MEMBER
1 POST

My speedometer doesn't work. I have replaced the computer and wire harness in the engine compartment and the transmission sensor is brand new and all new fuses plus a new instrument cluster in the dash. all the other gauges in the dash work fine. What should I check next?

Apr 18, 2010 at 5:30 AM

SQM

✓Experienced Mechanic
6,383 POSTS

Hello,

This could be due to a faulty vehicle speed sensor (VSS). The VSS is located on transmission housing.
It measures the shaft rotation and sends that signal to be converted into the speedometer display.
Faulty sensor or sensor with loose connection can trigger the speedometer to not work.

I have attached the diagrams showing the location as well as testing procedure for the VSS.

Please let me know if you have any questions.
Thank you.

Images (Click to enlarge)