GM Bulletin No.: 13234
Date: August 2013

Service Bulletin

SERVICE UPDATE
SUBJECT:

Service Update for Inventory and Customer Vehicles
Rough Engine Idle
Expires with Base Warranty

MODELS:

2013 Cadillac ATS
Equipped with 4-Cylinder Engine (LTG/LCV)

This service update includes vehicles in dealer inventory and customer vehicles that
return to the dealership for any reason. This bulletin will expire at the end of the involved
vehicle's New Vehicle Limited Warranty period.
PURPOSE
This bulletin provides a service procedure to reprogram the engine control module (ECM) on
certain 2013 model year Cadillac ATS vehicles, equipped with a 4-cylinder engine (LTG/LCV).
Some customers have commented that the engine idles rough when the vehicle is at a stop or
at the first startup after the vehicle has been sitting.
This service procedure should be completed as soon as possible on involved vehicles
currently in dealer inventory and customer vehicles that return to the dealer for any type
of service during the New Vehicle Limited Warranty coverage period.
VEHICLES INVOLVED
All involved vehicles are identified by VIN in the Global Warranty Management System –
Investigate Vehicle History Application. Dealership technicians should always check this site to
confirm vehicle involvement prior to beginning any required inspections and/or repairs. It is
important to routinely use this tool to verify eligibility because not all similar vehicles may be
involved regardless of description or option content.
Additionally, a list of involved vehicles currently in dealer inventory is available on the “Service
Update Bulletin Information” link under the “Service” tab in GM GlobalConnect (US) or attached
to the GlobalConnect message (Canada) used to release this bulletin. Customer vehicles that
return for service, for any reason, and are still covered under the vehicle's base warranty should
also be checked for vehicle eligibility.

Copyright 2013 General Motors. All Rights Reserved.

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August 2013

Bulletin No.: 13234

PART INFORMATION
No parts are required for this update.
SERVICE PROCEDURE
Note: Do NOT attempt to order the calibration number from GM Customer Care and Aftersales.
The calibration numbers required for this service procedure are programmed into control
modules via a Multiple Diagnostic Interface (MDI) with the calibration update. Use TIS2WEB on
or after August 1, 2013, to obtain the calibration. If you cannot access the calibration, call the
Techline Customer Support Center and it will be provided.
The following criteria must be met before performing the programming or learning procedure:


There are no charging system concerns. All charging system concerns must be repaired
before programming a control module.



Battery voltage is between 12–16 V. The battery must be fully charged before programming
the control module.



A battery charger is NOT connected to the vehicle battery. Incorrect system voltage or
voltage fluctuations from a battery charger may affect programming or control module
damage.



Note the engine oil life remaining percentage.



Turn OFF or disable any of the following systems that may put a load on the vehicle battery:


Twilight sentinel



Interior lights



Daytime running lights



HVAC systems



Radio



Engine cooling fans, etc



The ignition switch is in the proper position. The scan tool prompts you to turn ON the
ignition, with the engine OFF. DO NOT change the position of the ignition switch during the
programming procedure, unless instructed to do so.



All of the following tool connections are secure:


The connection at the data link connector (DLC)



The voltage supply circuits

DO NOT disturb the tool harnesses while programming. If an interruption occurs during the
programming procedure, the control module programming may be affected or control module
damage may occur.
To reprogram an existing ECM, perform the following procedure:
1. Connect a scan tool to the vehicle and access SPS. Refer to Service Programming System
(SPS) in SI.
2. Perform the SPS function K20 Engine Control Module - Programming and follow the onscreen instructions.
3. Clear DTCs after completing the Programming procedure.

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August 2013

Bulletin No.: 13234

4. Perform the SPS Function Immobilizer Learn and follow the on-screen instructions. Refer to
Immobilizer System Component Programming in SI.
5. Perform the SPS function Engine Control Module - Configuration & Setup and follow the onscreen instructions, if available.
6. Clear DTCs after completing the Configuration & Setup procedure.
WARRANTY TRANSACTION INFORMATION
Submit a transaction using the table below. All transactions should be submitted as a ZFAT
transaction type, unless noted otherwise.
Labor
Code
9100113

Description
Reprogram ECM

Labor
Time
0.3

DEALER PROGRAM RESPONSIBILITY
Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your
facility for service in the future, and the vehicle is still covered under the New Vehicle Limited
Warranty, you must take the steps necessary to be sure the service update correction has been
made before selling or releasing the vehicle.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that
may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the tools,
equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to
your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your vehicle may benefit from the information.

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