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Discussion Starter · #21 ·
Will do. This seems quite unnecessarily mysterious. Pretty weak that a simple emissions issue will disable the truck like this. Tried to make the title searchable.
 
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Discussion Starter · #22 ·
Fingers crossed that it just wants a computer reset that only they can do.

Ive been balls deep in this thing, flipping over all the stones. Frustrating as hell.
Still not too bad, as ive not had any proper repairs in 138k, only maintenance and wearout parts. Been able to do everything except trans fluid exchange myself.
 
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2019 zr2 gas crew cab. Avs aeroskin hood guard and hs2 havoc step bars. Weather tech splash guards
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I know the $1k plus diagnostic tools will have the function to force a stationary regen, but not everyone has those funds to throw at a tool.

This whole regen thing is the only hangup I have on going to a diesel. With my luck, I'd be in the middle of a family vacation and 200 miles from anywhere and the 100 mile warning would show itself. Why did it have to be so few of miles? At least give the consumer a thousand miles before hard shutdown. That way folks aren't in a bind during the most inopportune time this will occur.

Friend of mine recently bought one of the 3.0 duramax's in a sierra. He actually bought the one I was trying to strike a deal on. In the first 5k miles he has been towed twice for forced regen related issues. Both times was in a situation where there wasn't a loaner truck available to tow his business related trailer(lawn business) and he couldn't get an appointment quick enough with a dealer service shop to avoid going into reduced power/speed mode. Both times they forced a stationary regen and everything was good for several fillups. He is considering buying a tool to avoid being in this position again since his drive cycles don't seem to fit what are required for the automatic regen process to always complete.
 

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Will do. This seems quite unnecessarily mysterious. Pretty weak that a simple emissions issue will disable the truck like this. Tried to make the title searchable.
This whole regen thing is the only hangup I have on going to a diesel. With my luck, I'd be in the middle of a family vacation and 200 miles from anywhere and the 100 mile warning would show itself. Why did it have to be so few of miles? At least give the consumer a thousand miles before hard shutdown. That way folks aren't in a bind during the most inopportune time this will occur.
Exactly. Thankfully I haven’t had any issues in 21k miles and traveling, but it could sure ruin a vacation in a hurry.

On the military version of this truck they have what is referred to as a ‘combat mode’ (not that the engine has any emissions on it), but that mode enables them to get out of harms way.
GM should at least provide a means to have a certified ‘OnStar’ rep on ’speed dial’ with the button on the mirror to bypass that nonsense and give the driver the ability to get home or somewhere safe.
 
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2019 Z71 Diesel
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So I got the “def quality poor” message with the mileage countdown to limp mode, no CELs to be read, none on dash, none stored per obd2 scanner.
Ive replaced pos 2, pos 1 should show up any day now.

Which is the best way to clear the light if there are no cels showing?
Gm drive cycle? Better to do it with the obd scanner?
been following the older def threads but no activity.
Any info appreciated, thanks!
I have the Bluedriver scan tool. Lifetime support. Interactive with what others have done to fix problems. Best $99 I spent. Some faults won't clear with a scanner. You need to drive the vehicle and depending on its setup it either looks at cycles driven or time/miles driven. I had an intermittent one time EGR fault on my Chevy cruze diesel. Fault was locked. After driving a few days it cleared itself. Basically it looks at the system and if it doesn't fault again it clears. The CEL you can clear anytime. Hope that helps.
Bluedriver on amazon. Best deal.
 

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2018 Colorado CCLB Duramax
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Yup, I slept in the truck parked in a Chevy dealers lot when mine went into reduced speed .mode in the middle of a 1100 mi trip at night. They changed a NOX sensor the next am, I am concerned about getting stuck on the road again.
 

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Discussion Starter · #27 ·
I know the $1k plus diagnostic tools will have the function to force a stationary regen, but not everyone has those funds to throw at a tool.

This whole regen thing is the only hangup I have on going to a diesel. With my luck, I'd be in the middle of a family vacation and 200 miles from anywhere and the 100 mile warning would show itself. Why did it have to be so few of miles? At least give the consumer a thousand miles before hard shutdown. That way folks aren't in a bind during the most inopportune time this will occur.

Friend of mine recently bought one of the 3.0 duramax's in a sierra. He actually bought the one I was trying to strike a deal on. In the first 5k miles he has been towed twice for forced regen related issues. Both times was in a situation where there wasn't a loaner truck available to tow his business related trailer(lawn business) and he couldn't get an appointment quick enough with a dealer service shop to avoid going into reduced power/speed mode. Both times they forced a stationary regen and everything was good for several fillups. He is considering buying a tool to avoid being in this position again since his drive cycles don't seem to fit what are required for the automatic regen process to always complete.
It does give a lot more than 100 mi, but sadly i was 180mi from home. I think in all it took just over 200mi to get down to limp mode. I spent all my miles getting parts and getting to a shop to try to fix it.
 
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Discussion Starter · #28 ·
I have the Bluedriver scan tool. Lifetime support. Interactive with what others have done to fix problems. Best $99 I spent. Some faults won't clear with a scanner. You need to drive the vehicle and depending on its setup it either looks at cycles driven or time/miles driven. I had an intermittent one time EGR fault on my Chevy cruze diesel. Fault was locked. After driving a few days it cleared itself. Basically it looks at the system and if it doesn't fault again it clears. The CEL you can clear anytime. Hope that helps.
Bluedriver on amazon. Best deal.
i have that too. It doesnt have the ability to clear the def light though. It does clear cel but i have no cel thrown.
 

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2019 zr2 gas crew cab. Avs aeroskin hood guard and hs2 havoc step bars. Weather tech splash guards
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I have the Bluedriver scan tool. Lifetime support. Interactive with what others have done to fix problems. Best $99 I spent. Some faults won't clear with a scanner. You need to drive the vehicle and depending on its setup it either looks at cycles driven or time/miles driven. I had an intermittent one time EGR fault on my Chevy cruze diesel. Fault was locked. After driving a few days it cleared itself. Basically it looks at the system and if it doesn't fault again it clears. The CEL you can clear anytime. Hope that helps.
Bluedriver on amazon. Best deal.
Thanks, will have him research it. His isn't throwing faults for defective parts, just his drive cycles between jobs don't allow the regen to complete. Evidently after so may interrupts of the automatic regen cycle, you hit the final countdown and when that runs out, the forced stationary regen appears to be the only fix. Will have him look at the blue driver, but if it can't force a stationary regen, it wouldn't help here.
 

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Discussion Starter · #30 ·
GM drive cycle is surprisingly hard to do in traffic with like, other people driving. I only had one shot at it before limp mode and it didnt go to plan due to other traffic.
 

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Discussion Starter · #31 ·
Just spoke with svc guy, theres a shred of hope that this could get cleared up by the open recall related to the SCR. Fingers crossed for that. Theyre backed up, might be a few days before it gets attention though. Hes pretty confident it will, but otherwise confident its just a computer reset and force regen that only they can do, or that i cant w my obd2 scanner. Hoping the worst case is paying for an hour of labor to make computer hand magic on it.
 
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Discussion Starter · #32 ·
Truck is done! Exactly what i thought, just needed a reset of the reductant system from their magical gm cpu. The recall thing was done, but didnt fix the problem, so i had to pay for one hour labor. Im just glad its done and i wasnt losing my damn mind. On way to pick it up now before my she has to go to work.
 

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Truck is done! Exactly what i thought, just needed a reset of the reductant system from their magical gm cpu. The recall thing was done, but didnt fix the problem, so i had to pay for one hour labor. Im just glad its done and i wasnt losing my damn mind. On way to pick it up now before my she has to go to work.
Hey sorry I’ve been busy this past week. But I try to help out everyone’s diesel issues.

The reset they did is called a DEF FLUID QUALITY TEST. Which is not too unsimilar from a service Regen. Basically just runs the vehicle.

I made an app called Gretio Gretio - Automotive Scan Tool - Apps on Google Play
Which when combined with an OBDLINK MX+ allows people to do them at home for about $150. Bypassing the expensive dealership or expensive scan tools generally required.

There are also other resets but the quality test is the go to. Ie you can reset the NOx sensors but that won’t really accomplish much.

Anyway happy the truck is fixed. If it comes back, now you know.
 

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Discussion Starter · #34 ·
Cool, thanks for that. Certainly not impossible for it to happen again.
They said it was stuck in “level 7 limp mode”, they unstuck it from that, and did the regen recall also. Business as usual again. Thankfully only one labor hour at $175, and they made sure to mess up my tire pressures for me free of charge🤡 i run e rateds and carry a pop up camper so i run them at 41. No bigs but ironic. Level 7 limp mode sounds like it needed a viagra or something. Didnt know there were levels of limp mode. Didnt really pin down the cause, but hopefully wont give me any more trouble and my sensors are new now.
What a snafu!
 
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Cool, thanks for that. Certainly not impossible for it to happen again.
They said it was stuck in “level 7 limp mode”, they unstuck it from that, and did the regen recall also. Business as usual again. Thankfully only one labor hour at $175, and they made sure to mess up my tire pressures for me free of charge🤡 i run e rateds and carry a pop up camper so i run them at 41. No bigs but ironic. Level 7 limp mode sounds like it needed a viagra or something. Didnt know there were levels of limp mode. Didnt really pin down the cause, but hopefully wont give me any more trouble and my sensors are new now.
What a snafu!
That’s the warning level. The warning levels just correspond to the speed limitation. Nothing all that special.

REP is a different thing. But REP is the classical ’limp’ mode.
 
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