Hi all, I have a 97 f350 gasoline that recently all at once had a shut down of speedometer and odometer. I have the digital odometer display and it is completely off. Also starting at the same time my transmission is taking longer to shift into 2nd and 3rd gear and it shifts hard. Wondering if this could be a speed sensor? Fuse? Thank you for your time! Also if it is the speed sensor I was wondering where it is located for this year. Thanks!

 

You can try the speed sensor, it's in the rear axle. When you pull it, make sure it doesn't have metal flakes all over it. If it does, you have rearend problems causing the sensor to mess up.

Is your RABS light on? If it is, I would lean more toward it being the speed sensor, since that system is hooked directly to the sensor. The other piece that the sensor hooks to is the PSOM module in the cluster. This is the "Programmable Speedometer Odometer Module". This takes the raw speed sensor signal and conditions it. It then uses it to run the speedometer, and it also sends it out to the ECM where it uses it to fuel the engine and shift the transmission.

Check fuse 17, 10 amp in the underdash fuse panel. Also fuse 8, 15 amp in the underdash fuse panel.

 

A speed sensor cannot cause the odometer to be blank. A PSOM, however, since it has the pass the processed VSS signal from the sensor forward to the PCM for transmission shifting control is the more likely suspect.

 

 

Can you go to the store and get the codes pulled from the ECM? You should have a code if the speed sensor signal is missing. If you don't have a speed sensor code, then you might have a transmission problem of some kind like was mentioned.

You can do your approach, or you can try and get the codes pulled and do a little more figuring on it.

 

If the odometer is going blank then it is not the VSS on the rear end.
More than likely fuse 8 or 18 under the dash.