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Just a heads up for help/suggestions with others having this problem.... I found this website while trying to figure out why my Fuel Composition % was reading 52% even though I've never run E85 in my tank... I purchased a used 2016 Impala limited from a fleet auction where it sat for maybe a year or so with a dead battery. Soon after driving it around the P0175 cel lit up on my dash which was triggered because my Fuel composition sensor had failed/clogged/oxidized(?)
This caused my long term fuel trims to run up to -30 on both banks. I simply ordered a replacement Fuel composition sensor and changed the oil and this cleared the issue up. I suspect these sensors go bad if fuel sits in the lines for a long time. Might be worth doing this before sending it to the stealership.
 

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'12/'13/'16 Limited LT's
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Just a heads up for help/suggestions with others having this problem.... I found this website while trying to figure out why my Fuel Composition % was reading 52% even though I've never run E85 in my tank... I purchased a used 2016 Impala limited from a fleet auction where it sat for maybe a year or so with a dead battery. Soon after driving it around the P0175 cel lit up on my dash which was triggered because my Fuel composition sensor had failed/clogged/oxidized(?)
This caused my long term fuel trims to run up to -30 on both banks. I simply ordered a replacement Fuel composition sensor and changed the oil and this cleared the issue up. I suspect these sensors go bad if fuel sits in the lines for a long time. Might be worth doing this before sending it to the stealership.
Where is this sensor located on your '16 Limited?
 
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