HUD and Speedometer problems.. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-05-2004, 01:57 AM   #1
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Default HUD and Speedometer problems..

Ok, recently i've been noticing that my HUD has been spitting out random speeds for example: i'm cruising at 50 and it will jump from like 23 to 30..back to 50..on and on.. and then sometimes it will just go to a constant 0. ....kinda weird?? ... anyways , NOW MY SPEEDOMETER is doing that. The other day i was crusin around 40 and my speedometer went down to like 20 and then rapidly went up and down really fast for about a minute..then went back to normal... then a few minutes later it just dropped to 0 mph and did nothing. ..now today it worked fine, however, the HUD still read 0 mph. WHAT IS WRONG??? AHH!! i'm guessing some speedometer sensor went reallll bad. HELP!
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Old 03-05-2004, 02:41 AM   #2
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Is your OD doing anything wierd? I'm suspecting your VSS.
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Old 03-05-2004, 02:25 PM   #3
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A bad vehicle speed sensor will give some serious drivability problems, like using incorrect gears, etc. The HUD and speedo get the signal from the PCM, which gets its signal from the VSS.
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Old 03-05-2004, 02:36 PM   #4
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Occasionally I get a real quick, random HUD fluctuation. It only does it when I have my bad wheel speed sensor plugged in. I realize that the speedometer signal comes from the VSS on the tranny output shaft, but I've tested it, WSS unplugged, I get no fluctuation. Food for thought.
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Old 03-05-2004, 10:05 PM   #5
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to start, it'* still doing it. Secondly, i don't know what these abbreviations are for..so talk somewhat child terms for me because i dont know much about speedometers etc.. Thirdly.. can someone please tell me what to do? ..as far as like checking certain sensors and where they are... ?? i'm 17, i don't know too much. thanks.
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Old 03-05-2004, 10:56 PM   #6
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You will need to get your heads up display (hud) out to check the wiring.
Remove the defrost grill, and 2 screws.
The dark green wire with a white stripe (drkgrn/wht) is the Vehicle speed input wire, it comes from the Powertrain Control Module (pcm). The Vehicle Speed Sensor (vss) wires run to the pcm.
You will need to ensure this is a good connection to your hud and trace it back to the instrument cluster if you have too.
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