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Ok I have a 2015 Chevy Trax with 82,000 on it. For the last 2 weeks I keep getting this code and cant find the source of it. It can not be the MAF, Dirty Air filter, Upstream and Downstream o2 sensors, or even the spark plugs and coil pack. They have all been replaced. I also had a crack in the exhaust system that was repaired. I had a new battery that was installed in 2/21 and was tested and that was good as well. I have checked for vacuum leaks and nothing is disconnected or cracked.

I do notice that when I have a full tank of gas everything seems to be fine except for the CEL coming on and giving me that code. It idles rough when I get to a 1/4 of gas.


Thanks for the help.
 

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P0171 is always a tough one to solve, good luck.
 

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One more thing you can check is the purge solenoid valve. My 2017 LT had code P0171 earlier this year, only intermittenly at the beginning but later gave louder engine ticking sound and idle problems. The mechanic found out the pruge valve is bad and had to be replaced.
 
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