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K2xx (2014-2019 trucks) reliability

Shane Vaughan

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Shane Vaughan New Member

Shane Vaughan

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Hello,we are looking at a couple of k2xx trucks and were wondering what issues these trucks have.the trucks that im looking at have 6 Speeds so i know it these trucks will not have the issues with the transmission fluid like the A8's have,ive heard about the ac issues and the AFM/DOD issues,is there anything im missing thank you 

goeb34 Enthusiast

goeb34

Posted
Posted

Leaking 3rd brake lights, not mechanical but if unnoticed can get mold in the headliner

lryfer Enthusiast

lryfer

Posted
Posted

AFM Automatic Fuel Management has a long list going. Just got my 2018 and after driving it for a while acts up and doesnt run smooth like my 2006 Silverado. Some are putting plug in modules in to quit cutting out cylinders and running straight 8 cylinders all the time. I am thinking of doing this but will see.

rav3 Senior Enthusiast

rav3

Posted
Posted
24 minutes ago, Shane Vaughan said:

Hello,we are looking at a couple of k2xx trucks and were wondering what issues these trucks have.the trucks that im looking at have 6 Speeds so i know it these trucks will not have the issues with the transmission fluid like the A8's have,ive heard about the ac issues and the AFM/DOD issues,is there anything im missing thank you 

Shane, you didn't mention what year(s) you were looking for. My advice, is to look at buying a "certified" used from a dealer. They will come with a "Bumper to Bumper" 12 month/12,000 mile warranty, just like a new truck warranty. I know some have had issues with their dealers honoring the warranty but I have not. I bought a '17 back in Feb. I didn't notice that the new style gas cap flap was broken when I tried it out. I drop by & showed it to them a month later & they fixed it under warranty. I also noticed later that the side steps were pitting. I talked to the dealer about this. At 1st they said it didn't cover it because it was "Dealer installed". However I pointed out that it was listed on the RPO & they replaced them under warranty. If I had bought this from a used car lot I wouldn't have any luck at getting them replace. Just my .02 cents worth. I noticed used '17's are coming off 3 year leases and are hitting the dealers about now. Most are under 30k miles.

Shane Vaughan New Member

Shane Vaughan

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12 minutes ago, rav3 said:

Shane, you didn't mention what year(s) you were looking for. My advice, is to look at buying a "certified" used from a dealer. They will come with a "Bumper to Bumper" 12 month/12,000 mile warranty, just like a new truck warranty. I know some have had issues with their dealers honoring the warranty but I have not. I bought a '17 back in Feb. I didn't notice that the new style gas cap flap was broken when I tried it out. I drop by & showed it to them a month later & they fixed it under warranty. I also noticed later that the side steps were pitting. I talked to the dealer about this. At 1st they said it didn't cover it because it was "Dealer installed". However I pointed out that it was listed on the RPO & they replaced them under warranty. If I had bought this from a used car lot I wouldn't have any luck at getting them replace. Just my .02 cents worth. I noticed used '17's are coming off 3 year leases and are hitting the dealers about now. Most are under 30k miles.

the trucks i have been looking at are  17s and 18s,one is a 2016 but mainly 2017s and 2018s 

 

dieselfan1 Senior Enthusiast

dieselfan1

Posted
Posted

I think it's been said that the 18's have the bugs all worked out. I have two of them and have not had a hiccup from either one.

mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted

Somebody Jinxed me!  I finally had major problem on my 2016SLT.  Low Pressure Fuel Pump...DEAD at 114K

 

Now that is probably close to 7000 gallons of fuel pumped through her in VERY HOT Conditions.  I have had other vehicles with crapped Fuel pumps in South West before so I am not pinning it on GM JUNK YET?

 

I had to give this one to the Mechanic because I just filled the tank and knew it was Fuel Pump immediately and the Dentist wanted me too....Along with major Road Trip planned.  So I had to swallow the 1,000 Bill knowing exactly what had failed and I have NO options other than get fixed ASAP can't sit on it.  Win some loose some I guess.....

 

 

Ed S Enthusiast

Ed S

Posted
Posted

Where does one begin? Vacuum pumps failing left and right. Air conditioning systems failing, condensers cracking, leaking where they mount,  a/c lines to compressor cracking and leaking. A/c vents in the dash not directing cold air to one side or the other, "vent actuators failing".  The a/c issues are so bad people are trying to get GM to do a recall on the different failures. Transmission failures, mainly the 8 speeds. The dreaded drivetrain vibration issues at speeds over 65. Engine failures in the upper end due to the way the AFM is designed to work. Personally on my truck I've had both the left and right seat cushion heaters fail, one door lock actuator failure and the a/c vents not working properly as described above. I did bypass the AFM with a Range device and love it staying in 8 cylinder. Trying to save the engine is my reasoning for it. I suppose all makes of trucks have their issues. My thing is if they know it's an issue they should take care of us who spend over 40-50k on a truck. Warranties they provide aren't long enough for spending that kind of money.

imiller1974 Enthusiast

imiller1974

Posted
Posted

The ECM went out on mine, a couple weeks ago. Sat radio antenna leaked, fixed by dealer, leaked the next week. I siliconed it and the 3rd brake light. Vibration issues since new. New driveshaft, new axle shafts, new brake rotors, new tires, out of my pocket. Did it all at the same time, vibrations "mostly" gone. Rear seat rattles, still haven't fixed it, I just leave the seat up, and it doesn't rattle. Transmission shifts like ******. Even after a tune, it's better, but still ain't great... The factory paint suuuuuucks. 

 

My old 2014 Silverado, had vibration issues, shifted like crap, antenna leaked. Dealer never fixed any of it. Several dealers...

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      That is a fair point, and I agree that trying to log “everything in the truck” would be the wrong direction.   There are a lot of modules and a lot of traffic. If the product became a full-truck datalogger, the amount of data would get huge very quickly, and most owners would never use it.   I think the first useful version would need to be narrow: - powertrain-side event evidence - selected high-value parameters - communication / voltage / reset events - pre/post event window - short report first, raw log only as backup   One distinction I should make is between active OBD/PID polling and passive bus capture. If you are polling PIDs through OBD, then yes: the more parameters you request, the lower the effective sample rate becomes, and you are adding diagnostic traffic to a vehicle that is already busy running itself. With passive CAN capture, the recorder is not asking all the modules for data. It is listening to traffic that is already on the bus. So it does not consume vehicle bus bandwidth in the same way that a scan tool polling hundreds of PIDs would. But your point still applies in a different way.   Even if passive capture does not add bus traffic, the recorder still has limits: - processing rate - storage rate - timestamp accuracy - decoder workload - event filtering - report size - user attention span   So the answer cannot be “log everything and let the user figure it out.” The product would need to store enough raw evidence to be useful, but only decode, graph, and present the important parts around the event.   A practical report should probably show: - what triggered the capture - how much pre/post data was preserved - which selected parameters changed - how those values compared to baseline - whether the same pattern happened before - whether any voltage, reset, bus-off, lost-message, or communication fault occurred - selected graphs around the event - raw data only as supporting evidence   So I agree with you. More data is not automatically better. The real product is the reduction from raw data into a useful event report.
    • bluev8
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By bluev8 · Posted

      That makes sense, and I agree with most of that.   I think the product would need both: 1. a default powertrain template, so it is useful out of the box; 2. user-selected priority parameters, so the owner or shop can choose what they want to see first.   Different users are going to care about different things. One owner may care about oil pressure and voltage. Another may care about misfire trend, AFM/DFM behavior, or U-codes. A shop may want communication events and repeatability first. Your baseline point is probably the most important one. Raw data is not very useful unless the report can show what normal looked like for that vehicle under similar conditions.   The way I would think about it is: - start with a basic known-good baseline - learn normal behavior for that specific vehicle over time - allow the event to be overlaid against baseline - show whether the event was a one-time spike or a repeatable pattern - provide a simple severity level, but with clear limits on what that severity means   For example, early severity could be something like: - Info: event captured, no obvious abnormal pattern - Watch: value moved outside baseline, but not repeated - Warning: repeatable abnormal pattern under similar conditions - Critical: communication loss, voltage drop, bus-off, reset, or severe repeated event   I would not want the first version to say “replace this part.” That would be overclaiming unless there is repair-confirmed data behind it. It would be more honest to say “this pattern deserves inspection.”   On the OBD port question, I think OBD absolutely has a role. OBD is probably the right place for: - DTCs - freeze frame - VIN - calibration information - normal scan-tool parameters - Mode 6 / enhanced diagnostic data if available The reason I am still looking at an ECM-side recorder is that the failure may happen before anyone connects a scan tool. If the owner plugs in a scanner after the event, the pre-event evidence may already be gone unless the ECU happened to save it. So I do not see this as “OBD versus ECM-side.” I see it more like: - ECM-side recorder: always armed, rolling buffer, event evidence - OBD/DLC companion: DTCs, freeze frame, VIN, calibration, normal scan data - phone/cloud: status, notes, upload, report generation, notifications   I agree that phone connection and push notifications would be useful. I just would not want the phone or cloud connection to be required for capture. The recorder should save the event locally even if the phone is not connected. The phone should help with event marking, download, notes, upload, alerts, and report viewing.   For a default GM V8 event report, would this list make sense? - RPM - calculated load / MAP - throttle position - vehicle speed - gear / torque converter state if available - coolant temperature - oil pressure - oil temperature if available - battery voltage - commanded AFM/DFM state if available - actual AFM/DFM state if available - misfire counters / roughness by cylinder if available - fuel trims - relevant U-codes / communication events - bus-off / lost periodic message / module reset / voltage drop events Which of those would you remove, and what would you add?

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