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Ask Ram Head Your Own Question
Ram Head
Ram Head, Dodge Technician
Category: Dodge
Satisfied Customers: 96
Experience:  ASE Certified. Daimler Chrysler certified. Current diesel tech at Dodge dealership. Diesel certified
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1998 Dodge Neon: Replaced speed sensor unit..acts..intermittantly

Customer Question

1998 Dodge Neon Speedometer is acting erractic. Replaced speed sensor unit but the speedometer still acts eractic intermittantly
Submitted: 8 years ago.
Category: Dodge
Expert:  Ram Head replied 8 years ago.

Hello.

Are there any dtc's.

The output shaft speed sensor on the transmission sends the signal to the cluster for the speedometer.

Does it fluctuate with vehicle sitting still, as well as when driving?

This would be an indicator of rfi interference withing the wiring, routed near a plug wire or magnetic field.

Another way to descern it as rfi, when driving and speedo is erratic, put vehicle in neutral and shut off. Does speedometer return to normal or is it still erratic. If it returns normal, then this is your problem. If it is still erratic, I would be more inclined with other problems.

Hopefully this bit helps. Find out exactly when it is happening and lets go from there.

Thank you.

Customer: replied 8 years ago.
There are no dtc's. The speedo fluctuates only when driving and not when standing still. The speedo will fluctuate at times or go to "0" and stay there sometimes when driving.