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Discussion Starter · #1 ·
Hey guys, new poster here. I always find this forum really helpful. so here is my story. I have a 2019 with just over 71K.

Friday night, towing my camper like normal and all of a sudden I get a check engine light and it went into limp mode. we panicked as we out of town an these small northern towns don't have alot of service centers.

we decided to camp in a city park for the night. the next dat we we tried the dealer in that town, but of course, it's Saturday and nobody is working.

so good or bad we limped the truck and camper home, which was over two hours. talk about suck. can't get rpms above 2k and no fater than 50mph downhill.

Once home, got my scanner and it showed two DTCs. P0422 and P2463. Monday morning took it to my local dealer. A week later, I'm getting nothing but excuses.

Possibly facing a DPF replacement. Now I have the extended warranty but it doesn't cover everything.

Dealer claims the DEF injector clogged causing normal regeneration to not work properly. Recking multiple sensors and probably the DPF. I'm not sure what the truth is, but what a design failure.

So I'm stuck with a truck that cares more about the environment then it does about its owners.

Anyone else get stranded with a 2.8 Colorado?

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Twice stranded while towing. Once with this very code if I remember correctly at 55k near the Idaho, Montana, Wyoming border. Also stranded around 25k on the Washington/Oregon when the cov lockdowns started. That was a bad sensor. The solution involved all unreliable things 'falling off'. No problems since. Average 21mpg towing. Have seen as much as 41mpg unladen.
 

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Hey guys, new poster here. I always find this forum really helpful. so here is my story. I have a 2019 with just over 71K.

Friday night, towing my camper like normal and all of a sudden I get a check engine light and it went into limp mode. we panicked as we out of town an these small northern towns don't have alot of service centers.

we decided to camp in a city park for the night. the next dat we we tried the dealer in that town, but of course, it's Saturday and nobody is working.

so good or bad we limped the truck and camper home, which was over two hours. talk about suck. can't get rpms above 2k and no fater than 50mph downhill.

Once home, got my scanner and it showed two DTCs. P0422 and P2463. Monday morning took it to my local dealer. A week later, I'm getting nothing but excuses.

Possibly facing a DPF replacement. Now I have the extended warranty but it doesn't cover everything.

Dealer claims the DEF injector clogged causing normal regeneration to not work properly. Recking multiple sensors and probably the DPF. I'm not sure what the truth is, but what a design failure.

So I'm stuck with a truck that cares more about the environment then it does about its owners.

Anyone else get stranded with a 2.8 Colorado?

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View attachment 9745
The DEF injector has nothing to do with the DPF. I bet (with 71K on the clock) you could just change the pre and post NOX sensors on the DPF and do the factory Service-Bay REGEN and the rediness stuff and it will be fine.
 

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You may be able to just do the Service-Bay regen and rediness tests and that would solve your issue. See if you can find your DPF soot level % on your OBDii device.
 

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Discussion Starter · #5 ·
wish it was that easy, the dealer seems to have broken something. I'm not a tech for motors, but as it was explained to me is that a thing that provides the threads for a sensor, just fell out of the DPF. they are now dropping the exhaust and sending it to a specialist shop.

I had tried a manual regen before going to the dealer, I got excited cause the dtcs were cleaed and wasn't limping, but a 10 mile drive at 75 just resulted in more of the same. same DTCs, and limp mode.

Just sharing my story so others can be informed about potential issues.

thanks for ideas guys, happy trucking
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Twice stranded while towing. Once with this very code if I remember correctly at 55k near the Idaho, Montana, Wyoming border. Also stranded around 25k on the Washington/Oregon when the cov lockdowns started. That was a bad sensor. The solution involved all unreliable things 'falling off'. No problems since. Average 21mpg towing. Have seen as much as 41mpg unladen.
41 m/g. RU tuned/deleted? I get maybe slightly over 30 at 70 m/h not towing or carrying air dragging cargo., stock. Less on hilly highways.
 

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Discussion Starter · #7 ·
41 m/g. RU tuned/deleted? I get maybe slightly over 30 at 70 m/h not towing or carrying air dragging cargo., stock. Less on hilly highways.
Its stock with the Z71 package. My driving habits put me at about 22MPG avg. Almost 3 weeks later, the service shop has resolved the issues. All said and done, cost to me was $725.
 

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Discussion Starter · #9 ·
Best advise i have is Don't drive it like your on a drag strip and use that cruise control! With an unloaded truck, the range is awesome, but really depends on alot if factors like climbing mountain sides in 4wd, or speeding downhill or just coasting from stop light to stop light.

For me, MPG in a truck isn't as important as can it get the job done. My truck after 2.5 years is still mostly yes.
 

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Discussion Starter · #11 ·
The suspense is killing me

... what specifically were the issues? and the resolutions?
My issues are detailed above. Here are the service tech notes:
  • Attempted REGEN and SOOT did not lower. Soot Accumulation 188%
  • Contacted TAC and found MAP sensor full of soot and reading false. TAC recommends replace low pressure diesel hydrocarbon injector and retest.
  • Replaced HC injector and performed REGEN, Found to reduce soot to 10% but randomly would rise, Inspected and found DPF pressure differential sensor and pipe to DPF filter restricted giving out of spec readings.
  • Sensor and pipes serviced as a kit/assembly
  • Replaced HC injector
  • Replaced both EGT sensors in DPF.
  • Replaced MAP sensor
  • OK not lights or messages

    Parts listed on service bill (FP-Number). I dont know how these numbers line up but maybe you'all are smarter than I.
    12717296
    55568175
    84809757
 

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My issues are detailed above. Here are the service tech notes:
  • Attempted REGEN and SOOT did not lower. Soot Accumulation 188%
  • Contacted TAC and found MAP sensor full of soot and reading false. TAC recommends replace low pressure diesel hydrocarbon injector and retest.
  • Replaced HC injector and performed REGEN, Found to reduce soot to 10% but randomly would rise, Inspected and found DPF pressure differential sensor and pipe to DPF filter restricted giving out of spec readings.
  • Sensor and pipes serviced as a kit/assembly
  • Replaced HC injector
  • Replaced both EGT sensors in DPF.
  • Replaced MAP sensor
  • OK not lights or messages

    Parts listed on service bill (FP-Number). I dont know how these numbers line up but maybe you'all are smarter than I.
    12717296
    55568175
    84809757
Considering what they replaced, and knowing what the sensors cost, and the time aspect that's not a bad cost in my book.
 
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