Stored codes

MDG

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We have several codes that keep coming up.on our 2018 Equinox. Our dealer says they can not be repaired unless the vehicle is at the dealership when it is coming up on the readout. I find this hard to believe since it stores those codes for a purpose. The code clears on the readout when the vehicle is shut off.
 

zora

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You have a check engine light come on and when you turn off the engine and restart the light doesn't come back on immediately?
 
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