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Discussion Starter #1 (Edited)
Hello all,
I have a problem with a new truck I bought about 3 months ago. It feels like the engine surges/rpms fluctuate. This mainly occurs when the vehicle is cold or during the first start of the day. From 0-30 mph's it is the most noticeable. Today I started it and turned it off after about 10 seconds of idling due to not locking the front door of my house, and when I turned the key off it sputtered like and older carburated engine. I took it to the dealership within the first month of owning it and they advised me to keep driving it saying it was a "learning transmission". However it seems to be getting worse, it currently has about 3,000 on the odometer. It has the 5.3 engine and auto tranny.

Let me add that I got this truck to replace my diesel, so Im not sure if I am on a learning curve and this is normal, or has anyone else heard of or had this problem.

Thanks
Jeff
 

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Jeff,

I would like to set up a case with GM Customer Assistance. In order to start the process I will need your complete contact information (including full name, mailing address and phone number), VIN, current mileage and the involved dealership sent to me in a private message. I look forward to hearing from you.

Thank you and have a great weekend!
Caron, GM Customer Service

Hello all,
I have a problem with a new truck I bought about 3 months ago. It feels like the engine surges/rpms fluctuate. This mainly occurs when the vehicle is cold or during the first start of the day. From 0-30 mph's it is the most noticeable. Today I started it and turned it off after about 10 seconds of idling due to not locking the front door of my house, and when I turned the key off it sputtered like and older carburated engine. I took it to the dealership within the first month of owning it and they advised me to keep driving it saying it was a "learning transmission". However it seems to be getting worse, it currently has about 3,000 on the odometer. It has the 5.3 engine and auto tranny.

Let me add that I got this truck to replace my diesel, so Im not sure if I am on a learning curve and this is normal, or has anyone else heard of or had this problem.

Thanks
Jeff
 

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ya my 2011 silverado does that right when you first start it up but its not as bad as yours. When starting it up at night and putting it into drive i can see the headlights flicker a little bit and it sounds like the noise it makes when you adjust the pedals. It always does it twice when i start it up but the dealership said its just the computer loading every thing and it getting ready to go.
 

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Mine does the same thing. Its been in the shop at least 2-3 times every month and they cannot figure out whats wrong. Enough is enough its gone next week!
 

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I would be happy to look into this further. Do you have a case number? In order to do more research, I will need some more specific information from you such as your name, address, phone number, the VIN for the vehicle, current mileage, and dealer name. If you have further questions, please feel free to contact me either on the thread or via private message. Thank you.

Tricia, GM Customer Service.
 

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Discussion Starter #6 (Edited)
ok-for those interested, I think it has been resolved, or should i say the dealership fixed it. Im going to include all of there codes-I dont know if it is a dealership code or some type of universal diagnostic codes from chevy.

For the complaint of engine surge: "Cause FUEL PRESS. REGULATOR LEAKING.
DR DRIVEABILITY/ENGINE PERFORMANCE
2261 W
FC: PART#19256389 COUNT: 1

3736 SEE LINE B

Customer states when turns vehicle off the vehicle sputter and coughs before turning off completely
"CAUSE: F
L1200 FUEL TANK FUEL PUMP MODULE REPLACEMENT
2261 W
1 19256389 W-MODULE KI
DIAG DIANOSIS TIME
2261 W
ADDTIME ADD TIMES FOR WARRANTY
2261 W
FC:6061
PART# 19256389
COUNT: 1
3736 FUEL PRESSURE REGULATOR LEAKING CAUSING FUEL PRESSURE TO OBLEED OFF L12200. TESTED FOR FUEL PRESSURE AND FUEL PRESSURE DROPPED RAPIDLY. REMOVED FUEL TANK AND REPLACED FUEL PUMP. REINSTALLED FUEL PUMP AND RAODTESTED

I saw that CHEVY11 has the same problem, I hope this helps. I must add that GM was great to deal with as was the dealership that took care of me. Seems to drive like it should....Its been a few days and I have not been able to duplicate the problem. Thanks for the forum.
 

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mine does this not only when it's cold, it almost pushed me into a car once. I have just over 11,000 kms so far should not be still learning the trans.
 

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ok-for those interested, I think it has been resolved, or should i say the dealership fixed it. Im going to include all of there codes-I dont know if it is a dealership code or some type of universal diagnostic codes from chevy.

For the complaint of engine surge: "Cause FUEL PRESS. REGULATOR LEAKING.
DR DRIVEABILITY/ENGINE PERFORMANCE
2261 W
FC: PART#19256389 COUNT: 1

3736 SEE LINE B

Customer states when turns vehicle off the vehicle sputter and coughs before turning off completely
"CAUSE: F
L1200 FUEL TANK FUEL PUMP MODULE REPLACEMENT
2261 W
1 19256389 W-MODULE KI
DIAG DIANOSIS TIME
2261 W
ADDTIME ADD TIMES FOR WARRANTY
2261 W
FC:6061
PART# 19256389
COUNT: 1
3736 FUEL PRESSURE REGULATOR LEAKING CAUSING FUEL PRESSURE TO OBLEED OFF L12200. TESTED FOR FUEL PRESSURE AND FUEL PRESSURE DROPPED RAPIDLY. REMOVED FUEL TANK AND REPLACED FUEL PUMP. REINSTALLED FUEL PUMP AND RAODTESTED

I saw that CHEVY11 has the same problem, I hope this helps. I must add that GM was great to deal with as was the dealership that took care of me. Seems to drive like it should....Its been a few days and I have not been able to duplicate the problem. Thanks for the forum.
Glad you got it fixed. Looks like you have some good techs at the dealership there......

Hopefully those who have similar issues will be wise enough to forward that fix to their local Dealerships to check out.

This is EXACTLY the kind of post that is vital on a forum, much to often people post the problem but they never return to share the fix.
KUDOS

---------- Post added at 09:05 PM ---------- Previous post was at 09:01 PM ----------

Well I guess it's back to square one.... Started doing it again on Thursday. It feel like there is a miss this time though.
Doh...well let us know how it turns out.
 

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Discussion Starter #10
.......atleast I know now-I think...

Ok-ladies and gentlemen, I just returned from another trip to the dealership. Let me first say that I have always been happy with them, Im just not pleased with the vehicle. I took it in on 10-05-2011 and told them that it continued to do the engine surge problem.
I would scan this in if I could, so I'll type it for those that may have the same proplem, or for those who need/want it.


"#PIP4828:Rough Idle and/or Lack of Power on Acceleration After Cold Start.

Models: 2009-2011 Chevrolet Express, Silverado, Suburban
2009-2011 GMC Savana, Sierra
With any of the following V8 Engine RPO Codes:
6.0l-L76, L77, L96, LY6
__________________________________________________________________________________________________________________________________
The following diagnosis might be helpful if te vehicle exhibits the sumptom(s) described in the PI.

CONDITION/CONCERNS:
Some customers may complain of a rough idle and/or momentary lack of power after cold starting the engine and immeiately placing the transmission in gear. This concern will diminish within a couple of minutes of start up as the engine warms up. Upon inspection, no DTC's will be stored and all scan data will appear normal as well.

This may be a characteristic of the ECM calibration. The ECM calibration is designed to meet cold start emissions without the use of an AIR pump by retarding the timing to warm up the catalytic converter. Unfortunately, this may affect cold start drivability in some cases.

RECOMMENDATION/INSTRUCTIONS:

If SI diagnosis does not isolate the cause of this concern and all of the following statements apply, this should be considered a characteristic of the ECM calibration and no additional repairs should be performed:
1. The concern has been present since the vehicle was new.
2. The concern is greatly improved or eliminated if the engine is allowed to warm up for 2 minutes or more.
3. The concern is present on a similarly equipped vehicle.
4. The concern is still present when using one of the top-tier gasolines listed in the latest version of 04-06-04-047. Unless premium fuel is required, 87 octane should be used to get the best cold drivability performance"


I have couple of questions, my engine is not the 6.0L but the 5.3L, but has the same problem. Is that what it means by "similarly equiped vehicles"? Does anyone have any idea if they will be working on a fix? I just find it hard to believe that a problem has been identified, but no fix is out there.....

Anyway-sorry for the long post, just wanted to share the info I got today. Good luck and thanks for the forum.
 

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I am having the same issue with this "surge". My truck (2011 Silverado Crew Cab LTZ) has almost lunged into a vehicle in front of me in traffic. I have had this to the dealer where they had it for two days. They could not find any issues....(nothing in the computer...codes they said). Anyway, I feel like I have to ride the brake in fear that it will idle "surge" and basically cause me to lose control of the situation. I am calling this a safety issue, and I am looking for some direction here. It appears from dock429's posts that this was the symptom he/she was experiencing, but the post above...does not seem to address that issue. Anyone else have any input?

Thank you for your review.

"#PIP4828:Rough Idle and/or Lack of Power on Acceleration After Cold Start.

Models: 2009-2011 Chevrolet Express, Silverado, Suburban
2009-2011 GMC Savana,
Sierra

With any of the following V8 Engine RPO Codes:
6.0l-L76, L77, L96, LY6"
 

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Discussion Starter #12 (Edited)
Sorry for revamping this post, but the problem may be solved and a lesson learned for me. I took my truck back for the above problem on Friday about 0700. I had the truck sit for a while, hoping it would cool down enough to replicate the issue. Went on a test drive with my service writer and the head tech guy. Murphy's law took over and it did not show the problems. They asked to keep it at the dealership for the day. Around 4:30 they called and asked that I come back, that they may have found the problem. I arrive and meet a host of employees around my truck and a tech sitting in the drivers seat. He's turned slightly, sitting with his feet resting on the nerf bars and starts explaining the all day process with my truck. I really wanted him to stop dragging out the explanation (like the length of this response) and tell me the problem they discovered. As he explained the time line, i noticed the truck was on and idling. I then noticed the vehicle was in drive and the emergency brake was not on. About that time he revealed that they discovered that the rear drum brakes were not releasing properly.

It appears that this has not been an engine/ECM problem, but the brakes not properly disengage. I promise that I am not usually this wordy, just happy that it may be fixed and I can get back to liking my Chevrolet.....
 

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Excellent work detective. Now all of us who have experienced this issue , but with less dealership enthusiasm , can now go see about correcting the problem.

Thanks for all your efforts and posting to help others.
 

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Dock420,
Thanks for taking the time to make all your posts on this problem. As basically just a backyard guy when it comes to car repair, I really like to hear solutions to problems. Particularly so when the solution is a bit unexpected. Kudos to the dealership to figuring out the problem, and best of luck to you for the future.
 

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Dock420,
Thanks for taking the time to make all your posts on this problem. As basically just a backyard guy when it comes to car repair, I really like to hear solutions to problems. Particularly so when the solution is a bit unexpected. Kudos to the dealership to figuring out the problem, and best of luck to you for the future.
Yup. You are a car/truck junkie. Where in Utah?
 
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