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code mid 216 psid 20 fmi3

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 2019 granite ,ok here is the problem if i start the truck with headlight switch off i get this code and check is lite up on dash with lcm code. if i turn the headlight switch on and start the truck no code as soon as i turn switch off code pops up . could this be a bad switch ? or wire or lcm. i had it at mack they said everything was good when i picked it up as soon as i stated it code poped up. didnt go back in they where closing and i had to work

Edited by vinny933
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