what causes the speedometer(mph) not to work? it only happen to me this winter so far. although sometimes it'll jump up and down too. any suggestions what might cause that?

 

Your fuses are blown out or your guage cluster is missed pluged or it just doesn't work.

 

it do work but i think it can be the fuses. thanks

 

If CEL is on, check the CEL FIRST!!

If the CEL pertains to the speedo sensor, ding ding ding, it's probably just the sensor located ontop of the transmission.

If CEL is NOT on....
Problem: The speedo doesn't work but the odometer works.
Solution: Replace the cluster or just replace the speedo gauge

Problem: The speedo doesn't work AND the odometer doesn't work.
Solution 1*: Bad Sensor - Replace the speedo sensor in the transmission.
*CEL should be on
Solution 2: Bad Gauge - Replace cluster or just replace the speedo gauge
IF Neither solution above fixed it.
Solution 3: Check all wiring from the sensor to the gauge. Because the signal is disrupted somewhere.

 

thanks. thats what one of my buddy at work says too

 

Hows the speedo runing now.