Anyone else dealing with no speedo or odo on their Kia Optima

Models Optima
1

Hey all, I’m having issues with my 08 Kia Optima. The speedometer and odometer aren’t working. I’ve replaced the vehicle speed sensor, PCM is good, and the cluster is good. Dealer inspected it, no corrosion or damage found. Anyone have ideas

2

Ever checked the wiring harness for loose connections

3

KiaDiva said:
Ever checked the wiring harness for loose connections

Not yet. Last thing I did was a visual check with the dealer, no corrosion or damage, but maybe I should check it closer

4

KiaDiva said:
Ever checked the wiring harness for loose connections

Definitely check the wiring. I had a similar issue on my car, and it turned out to be a loose connection

5

fabricia said:
How about the vehicle speed sensor, was that replaced

Yeah, I actually replaced the speed sensor. I also have a used PCM and a used cluster I haven’t tried yet. I’m thinking it could be something with the harness though

6

KiaTalker said:
What year is your Optima

It’s an 08, manufactured in 02/08. Still hoping to get this fixed without too much extra cost

7

Did you have the instrument cluster tested for functionality

8

melissasavant said:
Did you have the instrument cluster tested for functionality

Dealer checked it visually but didn’t find anything wrong. I haven’t tried another test yet

9

How about the vehicle speed sensor, was that replaced

10

fabricia said:
How about the vehicle speed sensor, was that replaced

If you haven’t tested the used cluster, that might be worth a try. The cluster should be plug-and-play

11

Sounds like a harness issue if all other components are working. Have you checked the connection from the VSS to the PCM

12

Kia said:
Sounds like a harness issue if all other components are working. Have you checked the connection from the VSS to the PCM

Good point. I’ll need to check continuity between the PCM and cluster, and from the VSS to the PCM. I’ll probably have to remove the air cleaner box to get to it

13

Kia said:
Sounds like a harness issue if all other components are working. Have you checked the connection from the VSS to the PCM

Removing the air cleaner box can definitely help you access the connections. Let us know if you find anything

14

Any updates

15

OptimaPrime said:
Any updates

I did some continuity checks. Tested continuity, voltage, and ground on both input and output pulse generators. Also tested the PCU fuse, which was fine

16

OptimaPrime said:
Any updates

Continuity is a good sign. Next step could be checking the signal continuity from the ABS module to the PCM. Sometimes there’s a splice in the wiring for the ABS to PCM connection

17

@howdyrobert
Interesting. I’ll need to take a look at the ABS harness. Dealer mentioned a pigtail that might be causing the issue. I’ll see if I can locate the splice

18

@howdyrobert
A faulty splice could definitely interfere with the signal. Make sure all connections are solid

19

Had a similar problem with my car. Replaced the PCM, cluster, and speed sensor but the issue was in the wiring. Had to trace each connection to find it

20

Flippa said:
Had a similar problem with my car. Replaced the PCM, cluster, and speed sensor but the issue was in the wiring. Had to trace each connection to find it

I’m hoping it doesn’t come to that. Continuity tests so far have been good, but I’ll keep tracing if needed