Sierra 1500 4WD V8-6.0L (2007)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
A/T, Engine Controls - Chuggle/Surge/Harsh 1-2 Shift
Bulletin No.: 07-06-04-013A
Date: November 26, 2007
TECHNICAL
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(R) GEN IV 6.0L V8 Engine (VIN Y - RPO L76)
and HYDRA-MATIC(R) 4L70-E Transmission (RPO M70)
Supercede:
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).
Condition
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.
Correction
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.
SPS Information
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(R) is updated with the latest software version.
Warranty Information
