Jump to content

Exhaust Brake concerns

DBaker
 Share

Recommended Posts

DBaker Enthusiast

DBaker

Posted
Posted

I have a 2025 GMC 2500 Sierra with Duramax. Its not in the shop for the 4th time for the same issue, but this time they had a recording computer hooked to it to see if they could diagnose it. So far they have been unable to figure out the cause of the issue which is it goes into limp mode, traction control light comes on, service light on, reduced accleration message. After shutting it off, giving a little bit and restarting, everything but the check engine light goes away. AFter it sits a day, that does away as well. Its giving P060C code. Softwares have been flashed multiple times, new gateway module put in it, and GMC regional tech has been there over 15 hours working on it and found nothing. 

 

So when i took it in Saturday morning, the service manager saw that i had made note that i had the exhaust brake on. He immediately said this may be whats causing it. He said you can't use that unless on the highway and pulling a trailer of some sort, and that the owners manual states that. I have looked up the exhaust brake in owners manual and there is nothing saying you can't use it in town or without a trailer or anything to that affect. This issue has happened to me 5 times now since beginning of the year, twice with exhaust brake on, 3 times without it on so that alone tells me it is not the issue. 

 

Has anybody else experienced this type of issue with exhaust brake? Been told you can't use it in town or without trailer? Given any conditions you cannot use the exhaust brake for? I feel like this is a copout basically because they don't know what else to say. They have a tech case open with GM and i have case open with GM also for possible buy back or something else if issue gets fixed. Anybody have any thoughts or experienced anything similar to this?

64BAwagon Senior Enthusiast

64BAwagon

Posted
Posted

I think your analysis of the techs comments are accurate. Some people feel the need to say something even if they have nothing to say. Any claims made and not substantiated by a document or the manual should be dismissed. I would make note of this event and start keeping a log of any interactions going forward. Ask them to put everything in writing via an e-mail or text you can save. If it aint written down it didnt happen. This will help in the end if a resolution isnt found. 

newdude Senior Enthusiast

newdude

Posted
Posted
1 hour ago, DBaker said:

I have a 2025 GMC 2500 Sierra with Duramax. Its not in the shop for the 4th time for the same issue, but this time they had a recording computer hooked to it to see if they could diagnose it. So far they have been unable to figure out the cause of the issue which is it goes into limp mode, traction control light comes on, service light on, reduced accleration message. After shutting it off, giving a little bit and restarting, everything but the check engine light goes away. AFter it sits a day, that does away as well. Its giving P060C code. Softwares have been flashed multiple times, new gateway module put in it, and GMC regional tech has been there over 15 hours working on it and found nothing. 

 

So when i took it in Saturday morning, the service manager saw that i had made note that i had the exhaust brake on. He immediately said this may be whats causing it. He said you can't use that unless on the highway and pulling a trailer of some sort, and that the owners manual states that. I have looked up the exhaust brake in owners manual and there is nothing saying you can't use it in town or without a trailer or anything to that affect. This issue has happened to me 5 times now since beginning of the year, twice with exhaust brake on, 3 times without it on so that alone tells me it is not the issue. 

 

Has anybody else experienced this type of issue with exhaust brake? Been told you can't use it in town or without trailer? Given any conditions you cannot use the exhaust brake for? I feel like this is a copout basically because they don't know what else to say. They have a tech case open with GM and i have case open with GM also for possible buy back or something else if issue gets fixed. Anybody have any thoughts or experienced anything similar to this?

 

 

That's a line of horse.  Exhaust brake can be used any time you want to and it would not cause that code to set.

 

DTC P060C is Control Module Main Processor Performance.  It can set for the ECM or the TCM, and possibly other modules.  Its a computer processor issue that could be from an intermittent faulty ECM or TCM or wiring to those.  

 

The GM regional tech should try an ECM or TCM (whichever is setting that code) if they have not already done so (instead of just flashing things) and see if anything changes.  

 

Any chance you can ask them for a copy of the SAVI printout with DTCs and post a picture of it here?  

DBaker Enthusiast

DBaker

Posted
  • Author
Posted

I can ask for it next time i go there. I'm not familiar with that but i can ask. There were originally going to replace ECM I believe, but the engineers said not to cause it wasn't problem. Apparently there are multiple trucks out there with this problem and no fix yet. Not sure why the engineers think its not the problem. 

  • 1 month later...
DBaker Enthusiast

DBaker

Posted
  • Author
Posted

Just to give an update, the issue with the exhaust brake appears to be torque converter related. AFter much aggravation and fighting with it, they found the issue happens during deceleration when it goes into 5th gear around 35-40 mph. The engine rpm and the input shaft on tranny rpm are not syncing, which is causing the truck to go into derating mode and codes to come up. They put a new torque converter into it and it seems to have fixed the issue at hand, however now it leaks tranny fluid from what appears to be the input shaft area of transmission. I'm done fighting with it. The truck is going back to GM for a buy back hopefully and i'll start over with another new one. 

  • Sad 1

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

    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      I imagine the cold winters up here with repeated short runs in town every day for those that live and work in town and given what I have come to learn on this forum with DI engines having fuel dilution issues, and if they don't change the oil until it says to but keep driving it for a while, I bet all that is just lovely on those finicky lifters. 
    • teamjnz
      AWD conversion to Z71

      By teamjnz · Posted

      I just did some reading and Stabilitrak is more than a what I had originally thought. It is more of a vehicle control system to help the driver in precarious situations. I thought it was only the AWD system. Now I know. So I changed the title for this thread to AWD conversion to Z71 
    • teamjnz
      AWD conversion to Z71

      By teamjnz · Posted

      Sounds like converting will be a bigger endeavor than I was thinking. This truck doesn't have 2Hi like the Suburban did. The Tahoe has 4Hi and 4Lo and a button to turn of traction control.   From what I understand the Stabilitrak uses open diff in the front and rear. When wheel speed is not the same the stabilitrak uses the ABS system to slowdown the spinning wheel(s) to transfer power to the slower non-spinning wheel(s). I thought the transfer case was open too. Being able to transfer power either more to front or rear depending on wheel spin. Maybe I miss understood some information with you saying and power transfer is 50-50. Thanks
    • PunchT37
      OCI, not when but why?

      By PunchT37 · Posted

      My brother has a 2007 Avalanche with afm 5.3. It`s got 176,000 miles. Runs like a clock. Never been apart. Co worker has a 2010 Tahoe with afm 5.3. 230,000 miles. Never been apart. Runs like a clock. So, even though cyl deac is a weak spot, they can go the distance.   BUT, these engines had the oil changed regularly, AND had 5w30 as spec. I wonder if they would have lasted this far on 0w20? I`ll bet not.
    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      I certainly could be wrong but I hear of pickups far newer than that 2007 cutoff which may not be going to the wrecker but are having engine work done and be that a reman engine or new engine or trying to repair the existing engine. Some of it would be design issues as per the cylinder deactivation system that GM has and one of those lifters wiping out the cam and the question of oil changes moving the needle or not on that whole mess, or in the case of Ford pickup engines that have the long timing chains and wearing them out and the roller followers and phasers and some of that certainly goes back to oil change intervals. But in those various cases the truck has all sorts of life left in it and so the unfortunate owner and may be original owner or used market owner that is pouring money into repairs so the truck is not seeing the salvage yard yet but damage is happening by infrequent oil changes. A friends son had bought a 2018 I think it is half ton GM and it had some sort of extended or used dealer warranty on it and of course the lifter issue bites and its rattling and so the dealer had to swallow the bill and was at least 7000.00 and I think they only replaced what they felt they had to replace so yeah, I can see that being a ticking time bomb in the not too distant future. Would frequent oil changes cure all these engineering "marvels", probably not but some engine designs have shown that they do much better if the oil is changed a lot more often then if the manufacturer service claims are followed. New trucks cost so much that there is an incentive to keep the existing truck on the road by repairing. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...