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Code 24

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Old Oct 9, 2002 | 12:08 PM
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From: Gaffney, SC (upstate SC)
Car: 88 IROC-Z, 71 SS 454 Chevelle
Engine: 305 TPI, 454
Transmission: 5spd, th400
Code 24

I am getting a code 24 on my 88 IROC 305/5spd. The speedo does not work but the speedo cable is hooked up to the trans. Where do I look to correct the problem?
Code 24 means Variable Speed Sensor (am I right?) Where is this sensor located or is it part of the ECM and do I need to replace it?
:hail: TIA
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