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Beware the tear! 2013 Sonic MAF and Lean codes.

by shadetreetech on Nov 16 2017, 7:57 PM

A customer had just been to Auto Zone with their 2013 Chevy Sonic 1.8. They scanned the PCM and found a P0101 and P0171; and suggested a mass air flow sensor. Thankfully the customer opted to have the problem diagnosed . Reading the codes and watching the fuel trims showed the PCM was correcting for a lean condition. A visual inspection showed no obvious problems. Digging a little further I removed the air filter cover and found the intake boot torn! As it turns out this is HUGE problem on these cars and are covered by a campaign through GM.

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2 Replies

By 1986chevyman Dec 23 2018, 2:51 PM

I had a similar experience on one of these. It actually had a P0171 lean. I found the split boot by spraying carb cleaner and watching my short term fuel trims going very negative indicating an air leak. Upon inspection the air intake boot was ripped.

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By voltageviking Nov 30 2017, 6:07 AM

You definitely caught that one pretty easily. Another known common issue that will set those same codes, on this engine in both the Sonic and Cruze vehicles, Ian a tear in the PCV diaphragm located in the cylinder head cover assembly. You may notice a whistling sound at idle. If you remove the oil dipstick, the sound goes away, and sometimes you can get hear a suction sound coming from the small port located on the valve cover. Just something else to be wary of. I have replaced probably a dozen or so of these assemblies.

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