Speedo randomly works

mstng5point0

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Trying to help a friend fix his speedo on his 06 King Ranch. Speed sensor and connector on the rear axle are new. I have a good reading from the axle to the abs module. But no mph reading to the pcm. Sometimes it will randomly start working. But not usually.
 

6.0 Tech

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Check g100, its by the left headlight. I believe There was an ssm for it coming loose, and causing intermittent speedo, abs lights, and a few other things.

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Decker

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What is g100? Don't mean to highjack thread but could this cause my red parking light to come on speedo to cut out?
 

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