616 miles on the odometer and our new 2021 Tahoe LT won't start!!!! P1029 error code

[Fireman591]

Well tonight I went to start our vehicle and it cranked for 10 seconds and stopped. I tried it again and it fired up after 7 or so seconds, ran like the timing was off and quit. Onstar found this on the online scan: ----------------------------------------The Engine and Transmission System is not performing as expected. An issue has been detected in the Fuel Management System used to maintain, control and monitor fuel consumption.---------------------- P1029 is the error code.

Needless to say it will be getting towed to a Chevy dealership Monday. I am not a happy camper but thank God it happened in our garage and not out on the road somewhere.
I will update this thread once I find some answers from the dealership.

 

[Fireman591]

Anyone have an idea how to get a 2021 into neutral without the engine running? It won't shift into neutral via the shifter or via the transfer case unless the vehicle is running. Kinda tough right now since the vehicle will not start. Not looking forward to seeing my $65,000 vehicle getting dragged up a flatbed. I can't find any info in the manual for a shift override button or lever. This flat out SUCKS!!!!!!!

 

[PG01]

Press and hold the start button for more than 5 secs without touching brake pedal then shift trans or transfer case as usual

 

[Fireman591]

Press and hold the start button for more than 5 secs without touching brake pedal then shift trans or transfer case as usual

I tried that. The regular shifter won't move out of park and the transfer case will switch and complete its shift to everything but N and 4wd low. N flashes on the DIC but then returns to 2WD H.

 

[PG01]

I tried that. The regular shifter won't move out of park and the transfer case will switch and complete its shift to everything but N and 4wd low. N flashes on the DIC but then returns to 2WD H.

Hold it longer

 

[PG01]

Page 226 in your manual. Service mode

 

[Fireman591]

Hold it longer

I got the vehicle to go into service mode but when you try to switch out of park you get this message on the DIC " Conditions not right for shift" As for the transfer case it will move in and out of auto, 2wd and 4wd with no problem. When I try N all it does is flash for 5 seconds and return the DIC picture to 2wd. Kind of scary know this vehicle can't be put into neutral without the engine running. Kinda missing the old fashion shift lever now

 

[Fireman591]

UPDATE---------- Well after cranking the Tahoe for many attempts along with having it run a few times for ten seconds or so last night I put the vehicle on a charger and went to bed. Later this afternoon while attempting to get the vehicle in neutral I attempted to start it again. It fired up and seemed to run ok. I quickly backed the vehicle out of the garage and positioned it for the tow truck. I put a scanner on it and it is still throwing the P1029 code. Tomorrow morning I will attempt to get it to the GM dealer for service right when they open. Hopefully it makes it there on it's own power.-------------------------- Anyone know what the hell a P1029 code is? I looked online on many truck and GM forums and no history of that code for a GM vehicle that I could read about. I know it means other things for other car makers but wondering what it means on a GM product.

 

[Fireman591]

I got the vehicle to go into service mode but when you try to switch out of park you get this message on the DIC " Conditions not right for shift" As for the transfer case it will move in and out of auto, 2wd and 4wd with no problem. When I try N all it does is flash for 5 seconds and return the DIC picture to 2wd. Kind of scary know this vehicle can't be put into neutral without the engine running. Kinda missing the old fashion shift lever now

Ya I read everything in the manual related to starting last night. Just curious can anyone shift out of park or put their transfer case in N with the engine off? I tried it in normal and service mode with no luck.

 

[PG01]

Ya I read everything in the manual related to starting last night. Just curious can anyone shift out of park or put their transfer case in N with the engine off? I tried it in normal and service mode with no luck.

Not sure for newer years but there are certain steps for neutral so you can’t accidentally switch to it while driving.

 

[PG01]

Pg 238
Trans in neutral
press 2hi 5x within 10 secs.
Make sure parking brake is on and set tightly, even on level ground and in park it will roll ifvyransfer case is in neutral.

btw I’d disconnect battery for 15 and Let everthing reset. Check your intake and make sure filter and cover are tight and secure for you p1029 cide

 

[wjburken]

Anyone know what the hell a P1029 code is? I looked online on many truck and GM forums and no history of that code for a GM vehicle that I could read about. I know it means other things for other car makers but wondering what it means on a GM product.

My Innova DTC app shows this for that code.

 

[Fireman591]

UPDATE------------------------ I have been going outside every few hours to fire up the Tahoe to see if I can get it to replicate what happened last night. Every time it has fired up with no issues and this last time I noticed the steady check engine light is now off. I have an appointment at the dealership tomorrow morning to see what they can figure out. Still wondering what P1029 is. I also noticed that during this issue I never heard the normal sounds of the rear fuel pump precharge when approaching the vehicle with the fob or unlocking the door. Only a relay or solenoid click type noise under the hood. Weird stuff and I hope they can find an answer of what happened and how to prevent it from happening again. The vehicle flat out acted like it was not getting fuel. The battery power and cranking speed were normal. I will post up with answers once the dealer checks it out.

 

[Fireman591]

Pg 238
Trans in neutral
press 2hi 5x within 10 secs.
Make sure parking brake is on and set tightly, even on level ground and in park it will roll ifvyransfer case is in neutral.

btw I’d disconnect battery for 15 and Let everthing reset. Check your intake and make sure filter and cover are tight and secure for you p1029 cide

I did everything you wrote last night with the transfer case and no luck. It would flash the N in the DIC then return to 2h with no success. I did not want to clear the code or reset anything with disconnecting the battery since the vehicle is new and under warranty. The engine light is off now and everything seems to be running normal. I will take the print out from onstar with the P1029 details. Hopefully they can get me some answers on what the hell happened to a new vehicle with 600 miles on it.

 

[Fireman591]

My Innova DTC app shows this for that code.
View attachment 259786

Makes sense because I never heard the sounds of the fuel pump in the tank precharge like normal. Now the question is why?

 

[drakon543]

and now that you have messed with it enough it cleared the problem on its own and the dealership wont be able to do anything because they cant replicate the issue. well thats a possibility now atleast. if you have a serious problem its best to leave it alone so the garage can see exactly what the vehicle was doing.

 

[Fireman591]

and now that you have messed with it enough it cleared the problem on its own and the dealership wont be able to do anything because they cant replicate the issue. well thats a possibility now atleast. if you have a serious problem its best to leave it alone so the garage can see exactly what the vehicle was doing.

No worries. I have the code, the emails and texts from Onstar and I will be able to fill them in on everything that happened and what sounds were present and missing. Fuel was not making it to the engine. Just have to figure out why that rear fuel pump decided to take 14 hours off LOL

 

[drakon543]

No worries. I have the code, the emails and texts from Onstar and I will be able to fill them in on everything that happened and what sounds were present and missing. Fuel was not making it to the engine. Just have to figure out why that rear fuel pump decided to take 14 hours off LOL

yup and without the problem actually present now it could be ecm related wiring related or pump related or fuel pressure regulator related. since the problems not present you could get the truck right back since most mechanics now rely entirely thier scanner and a computer to tell them what to fix. if your problem isnt a known problem where they already know where to look they won't fix anything if they cant actually find anything.

 

[Stbentoak]

I could be amiss, but most serious codes are stored internally, even if you "Clear" them, and can only be cleared by a dealer. That way there is an ingrained record of what happened even if it "fixes" itself....

 

[drakon543]

I could be amiss, but most serious codes are stored internally, even if you "Clear" them, and can only be cleared by a dealer. That way there is an ingrained record of what happened even if it "fixes" itself....

the record will only say what the code was not exactly where the problem was as cel codes dont really do that. if the shop cant find what the problem was because it no longer exists you will get your vehicle back with no repairs done and be told to bring it back when the problem comes back.