Any suggestion why my speedometer won't register when doing below 30 miles per hour but would jump when going over 40 mph? Is it a speed sensor issue?

 

What year is the car?

...Lee

 

I have a 96 Volvo 850R, my speedometer registers only when I'm doing over 40 mph. It won't register below 30 mph. Is the speed sensor the culprit?

 

On a '96 there is no vehicle speed sensor per se. The vehicle speed signal is an integrated signal from all 4 wheel sensors through the ABS module. Most speedometer related problems are a result of a bad ABS module but yours is the first one that has your symptoms that I have heard of.

Does the car have any other problems such as an ABS or TRACS warning or a transmission warning light (The flashing up arrow)?

Absent any other issues it may well be a bad instrument cluster.

...Lee

 

I don't have any problem on my ABS and TRACS warning light or transmission for that matter. The problem only started when I was on an interstate driving and my speed was a constant 80 mph. The needle suddenly jump, went down to zero and then it started registering again. Thats when I notice on slow traffic, my speedometer won't register unless I drive over 40 mph. I'm not even sure about the accuracy anymore. Thanks for your input.