Electric Speedo

mags468 · Apr 29, 2020

I have a 1990 Suburban with a electric speedometer. When I start the sub speedo pegs then goes to 68 and stays there. Any ideas?

yevgenievich · Apr 29, 2020

Probably worth starting at the buffer box and see if false signal comes from there or is in the spedo it self

Vbb199 · Apr 29, 2020

I had that issue with my 90.

Exact same thing.

Occasionally acted up as time went on, I can start by telling you, replacing the VSS didn't make anything magical happen, neither did swapping the DRAC module under the radio with one that matched tire size and gear ratio (or pinout)

I believe its a speedo issue.
As far as what, I never dug that deep.
What I did discover however is once I "jiggled" the plug, the issue showed up alot less..
Either terminals at the speedo are the issue, or the speedo itself.

Vbb199 · Apr 29, 2020

https://www.gmsquarebody.com/threads/speedo-occasionally-works-90-burb-2wd.24429/

I never came to a resolution, or posted any results

chengny · Apr 29, 2020

mags468 said:
I have a 1990 Suburban with a electric speedometer. When I start the sub speedo pegs then goes to 68 and stays there. Any ideas?

Here's a diagnostic procedure. Pretty lame, I know, but it's all they provide in the Service Manual:

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Electric Speedo

mags468

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yevgenievich

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Vbb199

B-rate Hillbilly Customs

Vbb199

B-rate Hillbilly Customs

chengny

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