Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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If this is a diesel check and make sure the exhaust fluid is full.If it is low this will cause this fault here with it needing refilled then the vehicle driven for several miles for the computer to then recognize the fluid is full.If this is not a diesel let me know.
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O.k.,then there is a fault with one of the def components.This can be the fluid level sensor sending a false signal that it is low which can be common.
What has to be done from here very soon before the 100 miles is to have the fault codes read out/checked to see what codes are set then those codes diagnosed to locate and repair this issue.The codes have to be checked using a scan tool that will plug in and can read all computers in your vehicle.
I suspect the level sensor is the cause with it needing replaced.
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