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Discussion Starter · #1 ·
First introduction here and new to the forum. I just bought a 7000 mile used 2020 ZR2 with the 2.8L. It had been repurchased by GM to deal with an injector issue, resold with fresh warranty etc. According to the dealer, the original owner lost his patience with waiting for parts due to the 2020 global supply. I was assured GM took care of it. 4 hours into the ride home, check engine light came on. No smoke, nothing noticeable under hood - figured it was just a malfunctioning sensor causing a fault code. I drove another 11 hours home without issue. Got an email from ON Star saying the fault code is related to the active fuel management system - haven't got a code scanner on it yet, but intend to today or tomorrow. I ran a deleted cummins for years, so know the issues the emissions equipment and related sensors can cause, but would love some opinions on starting points or anything relative to this issue.

Thanks
 

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I would say take it back and get your money back. No sense in dealing with someone else's lemon.
 

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Discussion Starter · #4 ·
Really hate to have to do that - I love the truck. I'm gonna try a scanner on it today, if it is anything engine related, I'll bring it to the dealer, if exhaust and sensor related, may try to just fix it myself. Had O2 sensor issues with my cummins over and over until I deleted it all. Don't want to do the delete yet on this one as it only has 8000 miles on it and has 3 more years of powertrain warranty. Though the delete would likely provide some trouble free years ahead.
 

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Really hate to have to do that - I love the truck. I'm gonna try a scanner on it today, if it is anything engine related, I'll bring it to the dealer, if exhaust and sensor related, may try to just fix it myself. Had O2 sensor issues with my cummins over and over until I deleted it all. Don't want to do the delete yet on this one as it only has 8000 miles on it and has 3 more years of powertrain warranty. Though the delete would likely provide some trouble free years ahead.
Could you give me some guidance on this? Mine has 81k on the odo and so I'm ready to go for it. Would this exhaust system delete the emissions? I realize I'd need to flash the ECU so that when I disconnect the sensors it won't throw a cel. But the tuners seem to be more abundant than exhaust kits.

 

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Discussion Starter · #6 ·
Can't help with the 2.8l duramax yet, as I haven't done it. On my cummins, I got the tuner and an aluminized steel mid pipe that replaced the emissions equipment underneath the truck. I also deleted the egr setup under the hood attached to the engine. Left the catalytic converter and muffler in place. Installed a mini max tuner that allowed me to basically program the ecu as if none of that was on the truck. Worked fantastic. I didn't do so to crank up the boost and hot rod my truck, just wanted to stop having consistent issues with the O2 sensors
 

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Can't help with the 2.8l duramax yet, as I haven't done it. On my cummins, I got the tuner and an aluminized steel mid pipe that replaced the emissions equipment underneath the truck. I also deleted the egr setup under the hood attached to the engine. Left the catalytic converter and muffler in place. Installed a mini max tuner that allowed me to basically program the ecu as if none of that was on the truck. Worked fantastic. I didn't do so to crank up the boost and hot rod my truck, just wanted to stop having consistent issues with the O2 sensors
All I want is to have the truck run as it were supposed to before the brainless beurocracy got involved. I honestly feel like I'd keep the truck running forever with that crap off
 

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All I want is to have the truck run as it were supposed to before the brainless beurocracy got involved. I honestly feel like I'd keep the truck running forever with that crap off
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Well that ad says "Catback" you need turbo back to eliminate all of it. I would confirm what's actually included and not just go by the pictures.
 

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Discussion Starter · #9 ·
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Well that ad says "Catback" you need turbo back to eliminate all of it. I would confirm what's actually included and not just go by the pictures.
You shouldn't have to go full turbo back. I left at least one cat one cummins to burn cleaner than no cats. Not sure about the 2.8, but would assume it's similar.
 

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Discussion Starter · #10 ·
Check Engine light turned off on it's own...Hoping I just had to completely burn through some northern Illinois diesel and with the help of some diesel kleen, and running it over a 1000 miles did the trick. After a thorough review of the number of temp sensors, nox sensors etc under the truck related to the emissions, I wouldn't doubt I get another cel within weeks
 
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