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Discussion Starter #1
Second time in less than 4000 miles, I threw the same code/CEL on my 19 Z. The first time was at 700 miles in freeway traffic, gentile throttle for over 2 miles. This time I threw it after cruising a mile of switch-backs, downhill. The environment was light throttle, heavy braking. Obviously, this setup is very sensitive to light throttle. I had it reset by Chevy today. I'll keep you uodates. Here are deets on the code: Onstar identified the source as ECM - Engine System - P2098: The Emissions System is not performing as expected. An issue has been detected in the Exhaust Emissions System which monitors and controls exhaust gases released into the air from the engine.
 

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Is it possible that lack of throttle is causing the emission to "back up" in the system? I wonder if changing the exhaust mode would help... I drive the same sort of roads you talk about but have not experienced this issue.
 
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Discussion Starter #3
I've heard that and the intermittent throttle is the cause. I was in sport mode. What mode would you expect to prevent the issue?
 

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Good question - i had a similar issue on a previous car but not the C7... I would surmise the setting with the best airflow.. possibly touring would provide better airflow that is just a guess. Mine is also a stick so also use gear braking, not sure that matters or not.
 

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You may also have any injector that is a little weak. The only way to diagnose is to get into the odb level 3 data. This will tell you where the lean condition is coming from. I had a similiar situation and it ended up being injector number 8 was weak with only 8K miles.
 

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Discussion Starter #6
Thanks for all of the feedback. I threw the light again this week and reset it. Next time, I'll have the "specialists" dig into it.
 
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