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11-22-2003, 12:44 PM
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#1 |
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Registered User
Join Date: Nov 2003
Location: Washington
Posts: 6
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Code 24, VSS ??
Hi All! Newbie to the board here looking for help.
I'm getting a code 24. My Haynes manual says thats a Vehicle speed sensor but not much more. I only get this code when I'm putting around mountain roads in 4 wheel drive. The truck doesnt seem to be running any different when the code comes up. Where is the VSS? Could someone shine some light on what could be causing this code? Thanks, Tim Oh yea, the truck is a 87 GMC 3/4 ton 4X4. 350/TBI, Manual tranny 
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11-22-2003, 01:01 PM
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#2 |
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Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
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maybe a bad sensor... i dont know. unfortunately 95% of everyone here owns a pre-87 truck... you might consider posting in the 88+ board... just and idea... the gurus here might know....
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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11-22-2003, 01:38 PM
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#3 |
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5 day ban, learn to behave.
Join Date: Nov 2002
Location: san diego, ca
Posts: 683
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the VSS on your truck will be near the output shaft on the transfer case, where the speedo cable would normally hook up..
I dont know what year they started going to a complete electronic (cable-less) speedo system but thats how my 91 burb is. When you turn the key "ON" does the speedo goto 0 mph? (indicating an electronic guage) mike |
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11-22-2003, 02:48 PM
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#4 |
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5-7 dropped 87 CC Dually
Join Date: Sep 2003
Location: bay city mi
Posts: 326
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From the book. VSS Vehicle Speed Sennsor. This sensor sends a frequency signal to the ECM. The frequency increases as the vehicle moves faster to give the ECM vehicle speed information. My 88 k20 sub with 400 turbo doesn't have one of these. I would try resetting the computer. You can clear it buy unhooking the battery cable for a few mins. I have noticed that anytime that I change something on the motor(like putting on a spacer) I needed to reset the computer to keep from getting a code. Hope this helps. Good luck.
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I rather be in my 77 Sanger Picklefork Jet Hydro! |
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11-22-2003, 11:20 PM
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#5 |
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Registered User
Join Date: Dec 2002
Location: Stoney Creek, ON
Posts: 89
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I have the '87 GM manual. You're going to need a scan tool to find out if you have a problem with your VSS. The test involves comparing the VSS output to the actual speed. Hopefully you know somebody with one. Good luck.
Jason |
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11-23-2003, 01:04 AM
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#6 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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there is a good chance it is the buffer that pugs in to the back of the speedo head. It reads the revoultions of the speedometer cable.
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1974 Jimmy- 5.3/4L80e/NP241 |
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11-23-2003, 12:57 PM
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#7 |
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Registered User
Join Date: Nov 2003
Location: Washington
Posts: 6
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Thanks everyone! My truck does still have the speedo cable. In fact, for a while now my speedo has been acting up. Especially at low speed it bounces around alot. It seems to settle down and act fine after I'm up to speed and heading down the highway so I havnt been to worried aout it.....Ok I'll admit it. I've been to dang lazy to replace it. lol Anyhow, now I wonder if it isnt the source of the problem after learning of the buffer plug that jonboy mentioned.
Thanks again everyone!!! Happy Holidays to all!!! Tim
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