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09 GMC sierra 2500HD cel code U0100

massbowtie

By massbowtie
in Ask A GM Technician

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massbowtie Enthusiast

massbowtie

Posted
Posted

I had my cel come on in the past for u0449 evap solenoid after the first storm and was told its not a big deal and to just clear it until I could get under there and replace it. It has happened 3-4 times this winter. Ive been busy with snow,plowing,pushing piles back and hauling snow. needless to say I have been busy. That code would pop and disable the factory remote start from starting it. Ive cleared it and the truck wouldnt have it again for weeks,now only lasting a few days before it popped up again. It came back on the other day so I went to clear it,it cleared but in the process of clearing 0449 the dic lit up with abs module something or other,it wasnt on very long so I didnt get to write it down before it disappeared. After I cleared the u0449 the cel came back on, went thru scan process again and found Code U0100.I was able to clear it . Now it will remote start but it shuts off and not allow the truck to remote start again until I clear it. In the past I noticed that my idle was high750-800 rpm,shutting it off and restarting it would go away,never threw a code though. Occasionally when stoppping then taking off it would start off in 2nd gear then quickly downshift to 1st as I accelerated. Sorry for being so long but I wanted to give any history of any cel issues which other than what I wrote here there has been no other problems.Has anyone had this problem and what fixed it ? I wanted to check it out myself before I have to bring it in. I plan on replacing the evap solenoid this weekend,finally a weekend with no snow in the forecast.For sh--`s n giggles Im going to start by disconnecting battery cables off,ground pos. cable to try and reset the ecm.

Thanks for any help you can give.

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

I had my cel come on in the past for u0449 evap solenoid after the first storm and was told its not a big deal and to just clear it until I could get under there and replace it. It has happened 3-4 times this winter. Ive been busy with snow,plowing,pushing piles back and hauling snow. needless to say I have been busy. That code would pop and disable the factory remote start from starting it. Ive cleared it and the truck wouldnt have it again for weeks,now only lasting a few days before it popped up again. It came back on the other day so I went to clear it,it cleared but in the process of clearing 0449 the dic lit up with abs module something or other,it wasnt on very long so I didnt get to write it down before it disappeared. After I cleared the u0449 the cel came back on, went thru scan process again and found Code U0100.I was able to clear it . Now it will remote start but it shuts off and not allow the truck to remote start again until I clear it. In the past I noticed that my idle was high750-800 rpm,shutting it off and restarting it would go away,never threw a code though. Occasionally when stoppping then taking off it would start off in 2nd gear then quickly downshift to 1st as I accelerated. Sorry for being so long but I wanted to give any history of any cel issues which other than what I wrote here there has been no other problems.Has anyone had this problem and what fixed it ? I wanted to check it out myself before I have to bring it in. I plan on replacing the evap solenoid this weekend,finally a weekend with no snow in the forecast.For sh--`s n giggles Im going to start by disconnecting battery cables off,ground pos. cable to try and reset the ecm.

Thanks for any help you can give.

First off the code number is P0449 not u0449 ,,, P is for Powertrain ,

 

U0100 is a loss of communication DTC , if the code doesn't come back right away , the only thing that can be done BY A SHOP is to run the code in their service information and see if there is a TSB or PI ,

 

Not much you can do , I doubt anyone will reply on this thread unfortunately , you have an intermittent DTC and its a plow truck getting rode hard and put away rather wet .... Can't diagnose an intermittent code ,

 

Sorry . Why did you put a u instead of a P ?

massbowtie Enthusiast

massbowtie

Posted
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Posted

I understand you have seen alot of beat plow trucks but thats not how I take care of my trucks,first off ive been plowing for 32 years meaning I think I know how to do it.. Its washed as well the undercarriage,waxed at least once a month,and stays in a heated garage. I only plow and haul a 5th wheel trailer in the summer with it and it only has 27,000 miles on it.The truck before it was an 01 that I traded in when I got this one,it only had 76,000 miles on it.I never replaced any front end parts and had no troubles with my drivetrain just tires.brakes and regular service done to it. Sorry I took offense to the beat plow truck thing but I know what you say about plow trucks is typical but mine arent typical. Now thats out of the way.As for the u and p thing I confused the 2 but you knew what I meant,lol. After I posted yesterday I went and checked the history on the scanner and found there were 3 other codes with the u0100.They were u0101,u0442,I think the other one was u0131,but I cant find the paper that I wrote them down and its 5 degrees out. Im not going to go out and hook up the scanner and look at them now for that last one. What I did yesterday was cleared all the codes,disconnected the battery, grounded positive which should have cleared the hard codes. The truck has gone thru 5 or 6 key cycles(drive cycles) and no cel so far. I think I did something wrong when I was using the scanner which may have set the the codes off,I dunno..Im going to change the evap solenoid tomorrow and see how it goes from there. I do apreciate you responding so dont take any offense to my reply about beat plow trucks. I take pride in my vehicles and most people I plow with dont and are surprised that if we plow sunday and have more snow on monday that my truck has been washed in that short of time. I guess I should have looked more into it and gotten the info before I posted. Thanks for the reply.

P/S I work for a contractor by the hour plowing so I make more money by taking my time and dont beat the snot out of my truck

gmtech4 Senior Enthusiast

gmtech4

Posted
Posted

I understand you have seen alot of beat plow trucks but thats not how I take care of my trucks,first off ive been plowing for 32 years meaning I think I know how to do it.. Its washed as well the undercarriage,waxed at least once a month,and stays in a heated garage. I only plow and haul a 5th wheel trailer in the summer with it and it only has 27,000 miles on it.The truck before it was an 01 that I traded in when I got this one,it only had 76,000 miles on it.I never replaced any front end parts and had no troubles with my drivetrain just tires.brakes and regular service done to it. Sorry I took offense to the beat plow truck thing but I know what you say about plow trucks is typical but mine arent typical. Now thats out of the way.As for the u and p thing I confused the 2 but you knew what I meant,lol. After I posted yesterday I went and checked the history on the scanner and found there were 3 other codes with the u0100.They were u0101,u0442,I think the other one was u0131,but I cant find the paper that I wrote them down and its 5 degrees out. Im not going to go out and hook up the scanner and look at them now for that last one. What I did yesterday was cleared all the codes,disconnected the battery, grounded positive which should have cleared the hard codes. The truck has gone thru 5 or 6 key cycles(drive cycles) and no cel so far. I think I did something wrong when I was using the scanner which may have set the the codes off,I dunno..Im going to change the evap solenoid tomorrow and see how it goes from there. I do apreciate you responding so dont take any offense to my reply about beat plow trucks. I take pride in my vehicles and most people I plow with dont and are surprised that if we plow sunday and have more snow on monday that my truck has been washed in that short of time. I guess I should have looked more into it and gotten the info before I posted. Thanks for the reply.

P/S I work for a contractor by the hour plowing so I make more money by taking my time and dont beat the snot out of my truck

No , don't worry about it , it's refreashing to hear of ANYONE taking care of there shit lol,

 

I've seen a lot of beat up oil patch trucks in northern BC !!! Lol

 

U codes are strange , I never had any real hard u codes to diagnose at the dealer ,

 

Let me know if it comes back

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