Jump to content

04 gmc 2500hd 6.0L no communication while doing ckp relearn or misfire data watch

dave edward
 Share

Recommended Posts

dave edward New Member

dave edward

Posted
Posted

Hey all. I have 04 gmc sierra 2500hd. It has the p0300 code and I have an autel maxidas ds708 scanner. I have tried to do the ckp relearn with cgsulit scanner first and it had a no communication issue, when attempting the ckp relearn. I figured it was a bad scanner, returned it, and picked up a autel maxidas ds708 to do the relearn with. I got the scanner in finally, updated it fully, and attempted ckp relearn again. As it does the procedure I will go through the process, and right at the end, it will tell me that there is no communication. Tried multiple times and restarted etc, still the same issue. So I'm thinking their is a wiring issue, a break or an exposed wiring, maybe even a bad ground. Possibly a bad ecm at worst case. I was fiddling around with the scanner options, and i can watch live data on fuel injections, compression, read/erase codes and basically anything else with 1 other exception, and that is the misfire live data watch. It will start to show the data then no communication will pop up after 1-2 seconds. I see the data start pop up then no communication. Now I do know that it had a data communication fault at one point but it was solved due to a bad ground, and no more issues after that according to the previous owner and that was 8 years ago or so when that was fixed.
So I'm wondering if any of you have had this issue before and what possibly fixed it. I'm thinking I will have to track down a break in the wiring to the ecm or ckp but im really hoping its not that, because its never fun to do track down a break. 

Thanks for the help.

David89GMC Enthusiast

David89GMC

Posted
Posted

Why do you think it's the crank sensor?

A broken wire will prevent communication, not lose communication after it's working. A poor connection might cause intermittent communication, so check all your connections.

That China-made scanner may very well be the problem. There may be a good reason why it's a discontinued product.

Get a different scanner and try again.

try this link

dave edward New Member

dave edward

Posted
  • Author
Posted (edited)
56 minutes ago, David89GMC said:

Why do you think it's the crank sensor?

A broken wire will prevent communication, not lose communication after it's working. A poor connection might cause intermittent communication, so check all your connections.

That China-made scanner may very well be the problem. There may be a good reason why it's a discontinued product.

Get a different scanner and try again.

try this link

Due to the P0300 code which is a random misfire code. Everything i have looked up, whether its on this forum, other gm forums, youtube, or just searching on other forums. this generation of 4.8l, 5.3l, and 6.0l have this code issue, usually after spark plug, wire, and coil changes have a random misfire code P0300 that only goes away after doing a crank relearn via scanner. You may want to blame my scanner but this is one of the only scanners that can actually do it. I don't have access to a gm tech II, and this specific scanner was shown by several mechanics on other forums, or even showing how to do it on youtube using said scanner. So the issue I doubt is the scanner, and I cant find many others that can do this, also its discontinued because they upgraded the model to the maxidas ds808 and its variants and this is older hardware but unfortunately the newer scanners only are capable of dealing with newer vehicles. I have confirmed this directly with the company and they recommended a $1400 scanner, couldn't confirm if it actually work on an 04. So i had to find a decent used one for sale, which I did find a like new condition, so i snagged that since it was a good investment and fully updated the software. I talked to Innova as well and they don't have one that will work on an 04, and tried a few other companies, and simply couldn't find a useable one.
A wire can break, without breaking the casing, causing communication issues while being stressed during certain functions and working with others because it has an intermediate connection by the break touching. I see this occasionally with forklifts and cranes.  You are certainly right but my own personal experience with other machinery can give exceptions, but I should go through and double check all connections, clean and reseat them to make sure they are 100%. I'm just curious if anyone has come across this particular issue and wanted to see what they did to fix it, whether they found a bad spot in the harness, a broken or extremely dirty pin, or maybe the wiring to the ckp was bad but the ckp codes were not coming up. I'm hoping to narrow down some choices a bit better. 

Edited by dave edward
saw an error
davester Senior Enthusiast

davester

Posted
Posted (edited)

I haven't had a problem like this, but I would suggest getting a knockoff MDI unit (usb-obdii passthrough device), and use it with Tech2Win on a windows laptop, to do this work.  It's the dealer-level solution, and a LOT cheaper than $1400...

 

I bought one from here https://www.chinacardiags.com

along w Tech2Win and it works great with my '12 Silverado 3500 (haven't needed to use it w my '04 yet).  It's advertised on the site as an MDI 2, but it's an MDI 1 in an MDI2 housing.  But, it uses the oem Bosch driver and firmware, so it has good, long term support by the oem manufacturer, and it can do all the diagnostic tasks and access all the computers in the truck.

 

Edit:

As well, w a subscription to ACDelcoTDS (relatively cheap), you can also reprogram all the computers and perform various dealer-level tasks, such as getting a vin-locked radio to work w your truck.

 

Tech2Win works up to around '13 for trucks, then GM switched to GDS2 diagnostic software (which also works with the MDI unit) for newer vehicles (the exact cutoff year various w the vehicle, as GM didn't switch all the vehicles over at the same time).

Edited by davester

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

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,782
    Total Members
    8,960
    Most Online
    ShowMeShooter1332
    Newest Member
    ShowMeShooter1332
    Joined

  • Who's Online   3 Members, 0 Anonymous, 5,823 Guests (See full list)

  • Latest Articles

  • Posts

    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      I was around and remember that era very well, so I'm calling b/s on that statement. If they were that bad no police department or taxi company would've bought a single one ... but they were used in both services (and fire) for DECADES. They were bulletproof and proven. Even the early 21st century ones weren't too bad! The early models were legendary.   Mine is proof, but people like atlas are blinded by agenda and refuse to believe facts right before their very eyes.   Even decades after they were built, a new generation started driving them, posting all their builds and shenanigans on Grandmarq.net and Crownvic.net. The failures would show up then, since they all were deep past 100k-150k miles by that point, and younger drivers tend to be a little aggressive, especially with vehicles than can lay a one-tire fire for as long as you hold your foot in it. They've more than proven themselves over the decades.   The only thing that'll really take them out is road salt. The bodies and sheet metal were garbage. A victim of the cheapout FoMoCo and GM have been partaking in before then, and since.   Today it's the stuff that counts - the undercarriage that rots away first!     
    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Let me know how your vehicles do in 10 years. You don't know ******, kid. 😂    There's a reason that Panther platform was used as police, fire, and taxi service for DECADES ... long before you were born, apparently.
    • davester
      Disconnecting Battery

      By davester · Posted

      If your connector also has a big lever to get the connector on and off, you don't want to force the lever either way, as it becomes a bigger problem if you bust the lever or the mechanism it works.
    • davester
      Disconnecting Battery

      By davester · Posted

      It's just useful to disconnect the battery to prevent odd shorting out when unplugging/plugging stuff together.  I also  touch the two cable ends together (after disonnecting) to drain the small amount of stored battery energy in various modules.   I believe the main system where you need to be more concerned with, so you need to do the above and then wait some time, iss when you are working on the air bag system, to prevent inadvertent firing of the air bags.   The in-cab switches are just that, plain switches, it's generally not a problem to swap them in/out.  For my '12, I'll get an error message on the dash if I power up the truck w them unplugged, but that's it (power up= turn the ignition on).   The ITBC located above the spare tire is a computer that manages the trailer brake system.  That is probably more important to have the battery disconnected.  It does have to be programmed to the truck, either before or after it's installed, for it to work.  For my '12, I had a very hard time reinstalling the main connector to it (IDK if yours is the same or not), it turned out the silicon seal was jamming up, preventing it from going on all the way.  I finally got it fully installed by lubing the seal with a bit of dielectric grease, then it slid on and latched in place easily.
    • BCGM
      Remote Start Noise 2024 2500 HD Gas

      By BCGM · Posted

      JR ! I just got the truck back from the Dealership today . The technician did a cold remote start on the truck this morning and it made the noise . It was determined that it was a starter issue and replaced it under warranty . Of course   it did not make the sound after a new starter was put in because the truck was not cold . We will we see what happens tomorrow morning when I start the truck cold  . Keep tuned !   Oh I found a video on YouTube of a cold start and it did the same thing your truck and mine do , I will see if I can find it and post it up

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...