Intermittent speedometer problem

  • Thread starter Thread starter Zeppo
  • Start date Start date
Z

Zeppo

Twice in the last few weeks I've noticed the speedometer on my 2005 3.5L
Santa Fe was not working. A minute later it was fine and did not malfunction
for the rest of the ride. I've noticed this both time getting on to
expressways. It did not work until the next time the car came to a stop,
then worked fine.

Any idea what the problem is and why it only happens once in a while?

Thanks,
Jon
 
Twice in the last few weeks I've noticed the speedometer on my 2005 3.5L
Santa Fe was not working. A minute later it was fine and did not malfunction
for the rest of the ride. I've noticed this both time getting on to
expressways. It did not work until the next time the car came to a stop,
then worked fine.

Any idea what the problem is and why it only happens once in a while?

Thanks,
Jon
Click to expand...

I've seen three things cause this sort of problem, in order of
frequency:
1. Worn speedometer driven gear (on vehicle speed sensor in
transmission).
2. Broken/barely touching wire at vehicle speed sensor connector
3. Intermittent problem with vehicle speed sensor itself.
 
Twice in the last few weeks I've noticed the speedometer on my 2005 3.5L
Santa Fe was not working. A minute later it was fine and did not
malfunction
for the rest of the ride. I've noticed this both time getting on to
expressways. It did not work until the next time the car came to a stop,
then worked fine.

Any idea what the problem is and why it only happens once in a while?

Thanks,
Jon
Click to expand...

I've seen three things cause this sort of problem, in order of
frequency:
1. Worn speedometer driven gear (on vehicle speed sensor in
transmission).
2. Broken/barely touching wire at vehicle speed sensor connector
3. Intermittent problem with vehicle speed sensor itself.

Thanks HT. Can you point me to where the speed sensor is located? Maybe I
can eyeball it to see if I see an issue.

Also, I was under the impression the speedometer on the 3.5L was electronic.
Is that incorrect? Would it still have gears?

Jon
 
Thanks HT. Can you point me to where the speed sensor is located? Maybe I
can eyeball it to see if I see an issue.

Also, I was under the impression the speedometer on the 3.5L was electronic.
Is that incorrect? Would it still have gears?

Jon
Click to expand...

The sensor is located on top of the differential portion of the
transmission.

The speedometer is indeed electronic. The gear and sensor assembly
bolts onto the differential of the transmission. A gear on the
differential turns a gear on on the sensor assembly, which in turn
operates the sensor on the assembly. The sensor then sends a square
wave signal via a dedicated wire to the speedometer (and other
components).
 
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