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Truck throwing U0100 and C0045-18

Rufus Hardison
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Rufus Hardison New Member

Rufus Hardison

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Hey there, I was just driving around last night in my 2016 Sierra with the 5.3L and 8 speed tranny (yes my transmission is clunky as per usual for the 8 speeds), my check engine light came on but the truck was still driving around like normal. The truck still remote started so I knew it couldn't be too bad. I went and got scanned this morning and got a U0100 code and a C0045-18. The first code is for lost communication with ECM and the second is for left and right wheel speed sensors, low signal amplitude. Nothing has changed in the way the truck is driving but the code is on and hasn't gone away. Just looking for any ideas anyone has on a simple fix or a possible common cause for this. Thanks

MikeBMW Senior Enthusiast

MikeBMW

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Posted (edited)

When you had it scanned, were those legacy codes or active codes?
If legacy, just reset the check engine light with the scanner by clearing the codes.
If it comes back, well, gotta dig deeper.

Edited by MikeBMW
Rufus Hardison New Member

Rufus Hardison

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It crossed my mind that it could have been a one time occurance as opposed to being persistent, but didn’t really think about that it could be something that happened for a split second and will never occur again, not sure if the codes were legacy codes but the light has been on for probably 5 start-stop cycles now. I’ll unhook the battery and see if it goes away and doesn’t come back.

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