Jump to content

3.0 Duramax P1488 CEL code

Ogee1

By Ogee1
in Troubleshooting, Warranty & Recalls

 Share

Recommended Posts

BillP89 New Member

BillP89

Posted
Posted (edited)

2nd day of owning this truck got this same code...  I hope there is a fix and that driving with it isn’t so bad because my schedule is hectic and dealer is a little ways away. 

Edited by BillP89
  • Replies 46
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Pinnacle
Pinnacle

Shut up with your crapota bullshit already and dont come on here saying no maker has this figured out dont speak on behalf of other makers you know nothing. Toyota has the best diesel around the world

1997SierraSLT
1997SierraSLT

Toyota is intelligent enough to not release unproven and unreliable garbage to market and allow their customer base to be guinea  pigs.     One would think companies such as Caterpillar, Det

yousaveone
yousaveone

People need to quit relating the other Duramax to ours. Their not even ALMOST the same. the big diesels are designed by Isuzu and the babies by FEV. While the codes are the same in some instances this

  • 2 weeks later...
RockyBlue Enthusiast

RockyBlue

Posted
Posted

Still working through this issue.  Been to the dealer several times.  They have a few 3.0 Duramax trucks that are experiencing the same thing.  GM Engineering is now thinking it is a leak caused by a clamp.  New clamp is on back order so I will bring the truck back in once the part is available.  This back and forth is driving me crazy!

  • 4 weeks later...
Desmo Enthusiast

Desmo

Posted
Posted

My LM2 had this code, dealer performed a service on recall N202300791 to reflash the ECU or module that controls the DEF injection. They also replaced the failed sensor. I only have a few miles on the truck since this fix, hopefully the CEL stays away.

BurnsMax Enthusiast

BurnsMax

Posted
Posted (edited)
1 hour ago, gearheadesw said:

Wow, so no diesel in my future. Only in America can we totally screw up a diesel.

My LM2 has been solid with just a little over 5K on the clock.  Had a TSB for the shifter but that would be with any Silverado. Gas mileage is great.  Last trip I had 520 miles and 3 gallons left on the small 24 gallon tank.  Diesel is only .05-.10 more in my area

Edited by BurnsMax
Added info
Ogee1 Enthusiast

Ogee1

Posted
  • Author
Posted

Hey everybody, just wanted to update my experience with the P 1488 code. So after 7 trips to the dealership to fix this issue, I was given a letter from “GM senior engineer “ that there would be a recalibration done in September. Well this was back in late May and I had had enough of the issue, so I filed a buyback/ repurchase request. I really like the trucks performance and MPG.  GM bought back my truck and I got an almost identical truck in return. It took almost two and a half months, but it finally got done. I got an almost identical truck thinking that the issue was very limited and wouldn’t have to deal with it again. 

Well guess what? My second truck has this same damn code. I thought that I would be done with the issue, but now I have to wait until next month to see what this recalibration is going to do. I will keep everyone posted as to what happens with this so called recalibration. 

Hey Rockyblue, the clamp issue you posted is the first I’ve heard. Please keep us updated if the repair works or not. Thanks

steve841 Enthusiast

steve841

Posted
Posted
12 minutes ago, Ogee1 said:

Hey everybody, just wanted to update my experience with the P 1488 code. So after 7 trips to the dealership to fix this issue, I was given a letter from “GM senior engineer “ that there would be a recalibration done in September. Well this was back in late May and I had had enough of the issue, so I filed a buyback/ repurchase request. I really like the trucks performance and MPG.  GM bought back my truck and I got an almost identical truck in return. It took almost two and a half months, but it finally got done. I got an almost identical truck thinking that the issue was very limited and wouldn’t have to deal with it again. 

Well guess what? My second truck has this same damn code. I thought that I would be done with the issue, but now I have to wait until next month to see what this recalibration is going to do. I will keep everyone posted as to what happens with this so called recalibration. 

Hey Rockyblue, the clamp issue you posted is the first I’ve heard. Please keep us updated if the repair works or not. Thanks

 

Definitely update us!  Thanks

gearheadesw Senior Enthusiast

gearheadesw

Posted
Posted
On 8/25/2020 at 9:52 PM, BurnsMax said:

My LM2 has been solid with just a little over 5K on the clock.  Had a TSB for the shifter but that would be with any Silverado. Gas mileage is great.  Last trip I had 520 miles and 3 gallons left on the small 24 gallon tank.  Diesel is only .05-.10 more in my area

There's no denying that modern day diesels have serious problems. Just check this thread, yours might not, but it's very, VERY common, from one ton trucks down.

Colossus Senior Enthusiast

Colossus

Posted
Posted

One ton trucks?  Hell it's with the big rigs too!  The emissions stuff really screwed things up. 

RockyBlue Enthusiast

RockyBlue

Posted
Posted

Sorry been so long since I have posted here.  Still wrestling with this.  My dealer is Ed Bozarth Chevy in Colorado.  I am in the same dealership as another owner who had his in the shop for over a month and Chevy bought back the truck.  Mine is up next.  The clamp issue didn't turn up anything.  GM engineering shipped out a whole new exhaust assembly for the other truck owner but that didn't work either.  I like the performance on the truck but don't think I can pass emissions with an engine code.  Not to mention the possibility of going into Limp Mode which I've heard can happen.  

Colossus Senior Enthusiast

Colossus

Posted
Posted

Down at Park Meadows?  That is my neck of the woods.  They always treated me well every time I had to deal with them. 

 

yousaveone Enthusiast

yousaveone

Posted
Posted

Ed Bozarth is pretty good. My engine is great but truck has weird infotainment quirks and climate control issues. No matter how good the dealer is they only can do with the provided FSBs or TSBs to do. This is a bad on GM, and the USA in general. ALL PARTS need to be made and assembled in the USA; I'd pay more for that.

RockyBlue Enthusiast

RockyBlue

Posted
Posted
On 9/3/2020 at 10:07 PM, Colossus said:

Down at Park Meadows?  That is my neck of the woods.  They always treated me well every time I had to deal with them. 

 

Yes that is the one.  I will be taking my truck to them next week to start the process.  30 days in the shop for them to try and fix.  Then start the buy back process.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • PunchT37
      Parking Brake - Automatic Engagement Questions

      By PunchT37 · Posted

      I have a `25, 1500 that auto sets on incline. Never knew that at first. I have the electronic shifter. Just think if it didn`t do that? Unlike a mechanical shift that you can muscle out of park, how would you get this thing out? That would be a problem.   What I found out later is, I don`t have to push the button to release. Just put it in gear.   Setting parameters? Don`t know if it`s possible.
    • SoCal Angler
      Parking Brake - Automatic Engagement Questions

      By SoCal Angler · Posted

      2023 GMC 3500 HD, SLE, 6.6L Gas, 4x4, 6 Spd Options:  SLE Convenience Package; Driver Alert Package 1; Spray on Bedliner; X31 Off Road Package; TRAILERING MIRRORS, HEATED POWER -ADJUSTABLE, AUTO DIMMING, WITH TURN INDICATORS WHEELHOUSE LINERS, REAR INC. REAR AXLE - 3.73 RATIO INC. GVWR, 11,350 LBS. (5148 KG) INC. FRONT AND REAR PARK ASSIST, INC. ULTRASONIC     I have been launching my new boat and noticed some things related to the parking brake.. I usually set the parking brake (habit) when on flat ground for typical driving.    When backed down on the launch ramp to launch the boat and I place gear selector into Park, the parking brake activates automatically. My second nature is to set parking brake manually and noticed I was turing the parking brake off.  The parking brake appears to be setting itself automatically.   I looked all over my owner's manual and only found references to being on an incline and manually setting parking brake, or at times parking brake will be auto engaged, but nothing specific to my situation.    When is the parking brake automatically engaged?  Under what specific circumstances?  Can the auto set parameters be changed?     I like the auto set feature.  It would be nice if always engaged when shifted into Park and released when shifted out of Park (like my wifes 2025 RAV4).   Thanks!    
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      www.enginelabs.com/news/what-i-learned-today-bearing-clearances-vs-oil-viscosities/     www.enginelabs.com/news/oil-viscosity-can-the-numbers-be-misleading/ The Big Lie… Coming full circle to the reason Lake discusses the Porsche engines in particular. Based on the 2000 samples in the SPEEDiagnostix database, increasing the oil viscosity in these engines, even those run on the track, showed no significant difference in results.   The smoking gun was in the oil chemistry. That is where the data shows higher instances of more wear. Molybdenum was the key; the higher the amount, the less the wear. Speed postulates that higher viscosity oils have more thickeners to artificially inflate their viscosity numbers. These thickeners lose viscosity under shear, and the result is that not all oils of the same viscosity have the same shear stability.   Having enough viscosity is the most important characteristic, but according to Speed, once that required viscosity level is reached, additive chemistry matters more than additional viscosity. Speed also states, oil pressure problems on the racetrack aren’t a viscosity problem; it’s an oiling system problem. Running a thicker oil is just a band-aid for an underlying oiling system problem.
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      Can it still be Assembled II?   Viscosity on the decline by various means. Heat on the rise making that worse. Engine RPM in the tank. Smaller motors with more boost trying to emulate an electric motor. Full torque, zero rpm. Then we will triple the OCI. Argh.    But wait....there is more. LSPI has pushed a shift from Ca to Mg and as that cost more PLUS the run to lower sulfur compounds the TBN is moving in the wrong direction for the increased OCI's demanded.    That not being enough to placate a demand for a parameter they can't measure the other sulfur bearing compounds are also under attack. That would be zinc and phosphorus sulfonate compounds. To some degree those are being replaced with boron esters and others, i.e. titanium ect. All of which have shorter service lives. And there there is the "Secrete Sauce" marketing for AW adds that 'Can't be detected by UOA's" but trust me because I (the blenders) never ever lie.    Spoiler alert; ALL additives are sacrificial! Smaller amounts of the old blended with less robust versions of the new do not equal longer service lives. So what are the blenders recommending? Wait for it.......   MOVING THE GOAL POSTS! OMG      Let's declare the long standing TAN/TBN crossover irrelevant and tell people that soot is a great 'graphite' based lubricant which can aid tribo films. Wait, what? Let's declare that the standards used for oxidation and nitration were to conservative and can be expanded. Let's tell them that because GDI fuel dilution, although being a VISCOSITY KILLER and an acid generator is actually okay because we have better base oils that limit viscosity failure limits. (Said knowing this is measured in fractions of a centipoise and in bases not commonly used in shelf oils)   Lying from the heart is not just the new normal but we have a public, a very young public, that is so ignorant of the facts and so sure of their "RESEARCH" into AI driven models base in regurgitated  instead of scientific research based unvarnished, peer reviewed FACTS that the incoming guard is loosing their grip on reality and the OEM's are tickled pink while the blends bend the knee.    You have an ever limited set of tools to work with. And sooner or later those will be taken from you as the API and the EPA strangle the last remaining fluids from the system. What you have left is your wits. If you care to use them.    At some point in the very near future it will not longer be possible to do "What is best for the machine", and be replaced with "The best you have access too". You WILL be rewarded with half the life and twice the cost. That isn't that hard to predict.         
    • Chuck FB
      Software Update

      By Chuck FB · Posted

      I trust you saw the other comment where he knew what he was talking about !. Yes, these darned newer vehicles with all their so smart they are stupid technology, goes and drains the battery down. As you might see my other comment, I installed a Noco 5 battery tender under the hood and at this point still have the cord routed so I have to lift the hood and then plug it in but am typically parked in a garage or a shed so its not risking the engine hood in the wind. That way I am assured or hopefully so of not finding I have a battery drawn down and can't even start the truck and that also damages the battery to draw it down too far. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...