1987 (Vss)Vehicle Speed Sensor location

[87chebby]

I am getting code 24-vehicle speed (vss) sensor circuit fault.
I am not sure where the sensor is located. If anybody could advise me of where it is located I would appricate it.Also if anybody has ever had the same code give me some feed back on what it exactley was. Appriciate it

[gchemist]

LOL, the sensor is located on the trasmission tail housing. Is your speedo working correctly?

24 VSS Set when in motion only - disregard if set in park

http://www.cfm-tech.com/gm_tbi_trouble_codes.htm

[djunkie]

I just checked on my '87 and I am getting the same code. Speedo works when the truck is cold but after a few miles it stops working. No speed sensor on the transmission tailshaft on my 700r4. Just and adapter with the cable coming out of it that goes to the speedo. Is there a speed sensor behind the speedo?

[Tx Firefighter]

Little green box behind the instrument cluster.

[djunkie]

Originally Posted by Tx Firefighter

Little green box behind the instrument cluster.

Ok cool. Is this something I can get from a local parts store or am I gonna have to order online somewhere?
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[motornut]

1989 burb

[chris989]

What was the outcome of your speed sensor issue?

I have a 89 and i feel mine is affecting my timing but i never get any codes.

If i put my truck in neutral while drifting even at 5mph my idle increases to 1500 rpm.

[djunkie]

Originally Posted by chris989

What was the outcome of your speed sensor issue?

I have a 89 and i feel mine is affecting my timing but i never get any codes.

If i put my truck in neutral while drifting even at 5mph my idle increases to 1500 rpm.

Mine ended up being the speedo cable adapter at the trans. I removed it then went to a speedo shop to have the gear changed in the trans to calibrate it. Been fine ever since.
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