Last post on Nov 25, 2013 at 5:16 AM
You are in the Chevrolet Suburban & Tahoe
What is this discussion about?
Chevrolet Tahoe, Electrical
#5 of 185 Anyone get to the bottom of this?
Jan 03, 2010 (2:27 pm)
I have began experiencing this very issue. Check engine light engages sporadically, lean codes, and stabilitrak engages/disengages sporadically. There is a bulletin that most dealerships should be aware of which looks like our issue. I just want to know what type of cost am I looking at, should be fixed free of charge considering there is nothing any of us are doing outside of driving when this occurs.
Here is the bulletin:
#07-06-04-013A: L76 4L70-E Chuggle, Surge, Hesitation May Be Felt with Active Fuel Management System Cylinder Deactivation Transition from V8 Mode to V4 Mode or Harsh 1-2 Upshift (Reprogram ECM and TCM) - (Nov 26, 2007)
Read more: http://www.justanswer.com/questions/28wco-i-have-a-2007-chevrolet-avalanche-5-3-- flex-fuel-during-a#ixzz0bahF2U7I
Subject: L76 4L70-E Chuggle, Surge, Hesitation May be Felt with Active Fuel Management System Cylinder Deactivation Transition from V8 Mode to V4 Mode or a Harsh 1-2 Upshift (Reprogram ECM and TCM)
Models: 2007 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2007 GMC Sierra, Yukon, Yukon XL
with Active Fuel Management System Vortec® GEN IV 6.0L V8 Engine (VIN Y -- RPO L76)
and HYDRA-MATIC® 4L70-E Transmission (RPO M70)
This bulletin is being revised to remove the 4L60-E transmission and add condition information. Please discard Corporate Bulletin Number 07-06-04-013 (Section 06 -- Engine/Propulsion System).
Some customers may comment on a chuggle, surge or hesitation felt during an Active Fuel Management System (AFM) cylinder deactivation transition point or a harsh 1-2 upshift .
Before reprogramming the ECM and TCM, compare the vehicle to a like vehicle. This may be a normal condition for an Active Fuel Management System equipped vehicle and no repairs should be attempted. The vehicle you are evaluating may be a little harsh in AFM transition. A calibration update was released for the ECM and TCM to soften the feel of the AFM transition.
• Refer to Service Bulletin Number 06-08-47-001C for information on reprogramming two modules.
• ECM -- New calibration to address customer concern of bump during active fuel management transitions. Must also program TCM with latest calibrations.
• TCM -- New operating system and calibrations to improve engine performance and shift quality. You must also program the ECM with latest calibrations.
Reprogram the ECM and TCM with the latest calibrations if the above concern is encountered. Updated ECM and TCM calibrations are now available to address this concern. These calibrations, or any that follow, are designed to address this concern. Refer to Service Programming System (SPS) using the appropriate Service Information (SI) procedures. The new ECM and TCM calibrations will be available to dealerships as part of TIS2000 incremental satellite update version 4.5, for 2007 (available on 04/23/07), and on TIS DVD version 5.0/2007 or later, which will be mailed to dealers on 05/09/2007. If you cannot access the calibration, call the Techline Customer Support Center and it will be provided. As always, make sure your Tech 2® is updated with the latest software version.
Read more: http://www.justanswer.com/questions/28wco-i-have-a-2007-chevrolet-avalanche-5-3-- flex-fuel-during-a#ixzz0bahN0xIK
#6 of 185 Same Problems
Jan 04, 2010 (1:55 pm)
We purchased our 07 Tahoe used and have had it almost a year and a half and everything was great until a week ago.
First the car was very sluggish to start (we thought it was the cold weather causing this) and then the airbag light came on and we lost the entire instrument panel. We stopped the car and when we turned it back on the panel was back and the airbag light was gone but then it said to "service battery charging system" and the "service traction control" would come on and then go away (and we tested the traction control in the snow and it was still working fine).
Next the motor light came on and we had an appt. to hook it up to a diagnostic machine later in the day. However, that same morning we had the battery tested and were told we needed a new one so we replaced it since we thought if it was low maybe it was throwing the eletrical stuff off (and on our way there the engine light went off). So after the battery was changed out everything seemed okay and no lights came on all day and since the engine light had turned itself off we couldn't get a diagnosis from the machine.
We thought all was good until the next day when the "service Stabilitrak" came on intermittenly 3 times within 15 minutes and the car started shifting really hard between 1st and 2nd. We were going to see if the engine light came back so we could hook it up but now that I see we aren't the only ones with this problem I will try to contact the dealer about the service builletin mentioned above. Has anyone else had any luck getting this taken care of? If we are successful we will try to post back what was done.
Jan 08, 2010 (1:43 am)
I have an appointment scheduled for Monday and would like to go in with as much info as possible.
#8 of 185 Not figured out yet
Jan 08, 2010 (8:11 am)
It seems our Tahoe was calming down for the last week and I couldn't get it to display any problems so I couldn't go to the dealer to get it diagnosed unless the motor light came back on. Well last night the "service traction control" came back twice on my way home and this morning on my way to work the engine light re-appeared. Tonight we will be contacting our friend who has the diagnostic machine and see what we come up with. So as of now I don't have any helpful information but will try to post once we find out (hopefully) what is wrong.
#9 of 185 Same problem.
Jan 08, 2010 (4:34 pm)
Six months ago i bought my 07 tahoe everything was fine until last week I drove to work in the morning and at night didn't even started fuel gague and gear selector stopped working also the ABS light and The Traction control light came on after desconecting battery for 30 minutes finally started and the check engine light stayed on same afternoon had it scaned and it gave a code U0073 Module Control Buss. Next day all the lights were off and worked fine for three days then it happened again and never started, had it towed to dealer and after two days they called me saying that i needed a new battery for $195.95. According to dealer the battery had a bad cell and it could cause this malfunctions. Everithing was ok until today that the Cruise control stopped working and the extended waranty i got doesn't cover the cruise control system so tomorrow will try to get an appointment to have it fix and will update on how much is the cost.
#10 of 185 tahoe problems
Feb 03, 2010 (11:42 am)
Wow I am surprised how many others have same problems. We bought our 07 z71 new off the lot & it was really good for a while. But our first fix was a bad battery, and then it had the shifting problem where it kicked hard. Air bag light needed fixed, but it still comes back on. Then both front bearings went out ($500 a piece). The traction control has been giving problems. We are able to shut it off so it drives fine. Few sensors have been replaced. Luckily about everything has been covered under warranty. We are about to our 100k mile mark. So hopefully we have a lil bit of luck on our side.
#11 of 185 Re: Not figured out yet [valdal84]
May 11, 2011 (4:37 pm)
I know this is an old forum but has anyone actually seen an official solution for this problem? My local dealership has not been able to find the answer for over a year now. I have Stabletrack lights coming on 5 times a day and it's sad how used to it I am. If anyone has had the updates work that where described in the TSB please let me know.
#12 of 185 Re: Not figured out yet [benjo777]
May 17, 2011 (10:29 am)
I apologize that you are experiencing concerns with your vehicle. Have you had a chance to speak with your local dealer about this? I look forward to your response.
GM Customer Service
#13 of 185 Re: Not figured out yet [gmcustsvc]
May 18, 2011 (12:53 pm)
I started taking my Tahoe in to our dealership over a year ago when it had 95k miles on it. They could never figure it out and even had my car for over three weeks, still no solution. A data recorder was place in my car and still no solution . I have spoken to GM national service and was eventually forwarded to a regional service rep who eventually told me that there was nothing I could do if they couldn't find the root cause, and in addition was very unprofessional about helping me. Now 8 months later and out of warranty with 106k I deal with this problem everyday and drive an unreliable vehicle. Maybe you can help with this since I'm at a dead end. Not happy with GM right now and really question the company after this experience. I would be glad to talk with you about this over the phone if you want more details.
May 18, 2011 (4:35 pm)
my dealership figured it out. it was a body modular sensor? If you want tell your dealer to call Fuller Chevrolet in Rincon GA. Thats where they figured it out and fixed it.