Hello, everyone I have an 03 Rubicon and recently my speedometer started reading as if i was going 100 mph but i wasnt even able to reach 40 mph. I disconnected the rear speed sensor and was able to finish my drive normally just without the speedometer. i found a replacement sensor and connected it and am still having the issue of my speedometer reading way higher than i am going. so i have the sensor mounted without being connected to still be able to drive it, but if anyone has any suggestions as to what the problem could be would be greatly appreciated.
Rear speed sensor? Speedometer issue?
- Thread starter MJ2018
- Start date
Was this happening before or after you replaced the gauge cluster (which you mentioned in another thread)?
i had never had the issue before with the old cluster. Drove for a couple months with the new one and didnt have the issue either. The only thing i had done before it happened was change my front diff fluid.
Inspect the wiring and connectors leading to the speed sensor. Look for any signs of damage, corrosion, or loose connections that could cause faulty readings.
Sometimes, the issue may be the gauge cluster itself. A malfunctioning speedometer could be sending incorrect signals. Given that you just replaced the gauge cluster, this is suspect to me. Especially since I'm assuming it was a used gauge cluster you swapped in?
In rare cases, the PCM might be providing incorrect readings. Not sure how common this is, but if it's something you want to rule out, you could always send the PCM to @Wranglerfix to test for you.
Sometimes, the issue may be the gauge cluster itself. A malfunctioning speedometer could be sending incorrect signals. Given that you just replaced the gauge cluster, this is suspect to me. Especially since I'm assuming it was a used gauge cluster you swapped in?
In rare cases, the PCM might be providing incorrect readings. Not sure how common this is, but if it's something you want to rule out, you could always send the PCM to @Wranglerfix to test for you.
I will inspect the wiring and connectors tomorrow morning when i get home from work, and i still have my old cluster that the speedometer worked fine on so i plan to swap back to it to see if that fixes the issue. The new cluster i put on was used with 74k on the odometer
I think the problem is that regardless of the mileage, you have the age issue. These things are old enough now that the age of them is often times a more determining factor than the mileage.
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