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U0402 and P0723 error codes on 2016 GMC Sierra 1500, 4WD

jeric2_us
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jeric2_us New Member

jeric2_us

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I have the above error codes and have replaced the Output Shaft Speed Sensor with no success.  The truck will run fine for a bit, then the speedometer dips to 0, then back up to whatever speed I'm going, the check engine light comes on and the truck does not shift out of high gear.  I clear the code and it just keeps doing the same thing.  I've had it on a lift with it in gear and pulled and pushed on the wiring harness with no success.  I don't think it's that.  Any suggestions on what to check next?

Edited by jeric2_us
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  • jeric2_us changed the title to U0402 and P0723 error codes on 2016 GMC Sierra 1500, 4WD

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