Customer Satisfaction Program
15827 Emergency Vehicle Reduced Power
Reference Number:
GWM Number:
Attention:

Release Date:
Revision:

N151703910
2015827

August 2016
00

This program is in effect until August 31, 2018.

Make
Chevrolet

Model
Express
Silverado HD
Savana

GMC

Model Year
From
To
2012
2012

RPO
LGH
YF2

Description
Duramax Diesel Engine
Ambulance Upfitter

Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition

Correction

Certain 2012 model year Chevrolet Express, Silverado HD, and GMC Savana vehicles, equipped with
Duramax diesel engine (RPO LGH) and Ambulance Upfitter (RPO YF2), despite prior service may still
have a condition in which the emission control system as designed will limit speed under certain
conditions. In receiving prior service for the condition covered by GM Customer Satisfaction Program
15801, some of these vehicles’ engine control modules (ECM) were reprogrammed with a new calibration
that still had emission control system speed limitations. The EPA has approved General Motor’s request
to remove the emission control system speed limitations on these emergency vehicles where applicable,
and this new Customer Satisfaction Program is intended to ensure that the limitations are removed.
Reprogram the engine control module (ECM) with new calibration for emergency vehicles, which will
remove the emission control system speed limitations, and also provide an earlier warning for diesel
particulate filter (DPF) regeneration.

Parts
No parts are required for this procedure.
Warranty Information
Labor
Operation
9102374

Description
Engine Control Module Reprogramming with SPS (Express/Savana)
Engine Control Module Reprogramming with SPS (Silverado)

Copyright 2016 General Motors. All Rights Reserved.

Labor
Time
0.4
0.3

Trans.
Type
ZFAT
ZFAT

Net
Item
N/A
N/A

Page 1 of 4

Customer Satisfaction Program
15827 Emergency Vehicle Reduced Power
Service Procedure
Note: Carefully read and follow the instructions below.
 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.
 Do NOT program a control module unless directed to by a service procedure or a service bulletin. If the control
module is not properly configured with the correct calibration software, the control module will not control all of
the vehicle features properly.
 Ensure the programming tool is equipped with the latest software and is securely connected to the data link
connector. If there is an interruption during programming, programming failure or control module damage may
occur.
 Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will
interrupt programming. When required, install the EL-49642 SPS Programming Support Tool to maintain system
voltage. If not available, connect a fully charged 12 V jumper or booster pack disconnected from the AC voltage
supply. DO NOT connect a battery charger.
 Turn OFF or disable systems that may put a load on the vehicles battery such as; interior lights, exterior lights
(including daytime running lights), HVAC, radio, etc.
 During the programming procedure, follow the SPS prompts for the correct ignition switch position.
 Clear DTCs after programming is complete. Clearing powertrain DTCs will set the Inspection/Maintenance (I/M)
system status indicators to NO.
 Prior to programming, record the engine oil life percentage remaining.
Reprogram the K20 Engine Control Module. Refer to K20 Engine Control Module: Programming and Setup (LGH), K20
Engine Control Module: Programming and Setup (LGH or LML), or K20 Engine Control Module: Programming and Setup.
Note: If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.
Dealer Responsibility
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this program must be held and inspected/repaired per the service procedure of this bulletin before
customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealertraded, released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle,
or ownership, through August 31, 2018. Customers who have recently purchased vehicles sold from your vehicle
inventory, and for which there is no customer information indicated on the involved vehicle listing, are to be contacted by
the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this
bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program followup cards should not be used for this purpose, since the customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is in your facility for service
through August 31, 2018, you must take the steps necessary to be sure the program correction has been made before
selling or releasing the vehicle.

Page 2 of 4

Customer Satisfaction Program
15827 Emergency Vehicle Reduced Power
Dealer Reports
For dealers with involved vehicles, a listing with involved vehicles has been prepared and will be provided to U.S. and
Canadian dealers through the GM GlobalConnect Recall Reports, or sent directly to export dealers. The listing may
contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor
vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in
several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to
complete this program.
Customer Notification
USA & Canada - General Motors will notify customers of this program on their vehicle (see copy of customer letter included
with this bulletin).

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.

We Support
Voluntary Technician
Certification

Page 3 of 4

Customer Satisfaction Program
15827 Emergency Vehicle Reduced Power
August 2016
This notice applies to your vehicle, VIN: ________________________________
Dear General Motors Customer:
We have learned that your 2012 model year Chevrolet Express, Silverado HD, or GMC Savana equipped with Duramax
diesel engine and Ambulance Upfitter despite prior service may still have a condition in which the emission control
system as designed will limit speed under certain conditions. In receiving prior service for the condition covered by GM
Customer Satisfaction Program 15801, some of these vehicles’ engine control modules (ECM) were reprogrammed with
a new calibration that still had emission control system speed limitations. The EPA has approved General Motor’s
request to remove the emission control system speed limitations on these emergency vehicles where applicable, and
this new Customer Satisfaction Program is intended to ensure that the limitations are removed.
Your satisfaction with your Express, Silverado HD, or Savana is very important to us, so we are announcing a program
to fix this condition.
What We Will Do: Your GM dealer will reprogram the engine control module. This service will be performed for you at
no charge until August 31, 2018. After that, any applicable warranty will apply.
What You Should Do: To limit any possible inconvenience, we recommend that you contact your dealer as soon as
possible to schedule an appointment for this repair.
If you have any questions or concerns that your dealer is unable to resolve, please contact the appropriate Customer
Assistance Center at the number listed below.
Division
Chevrolet
GMC
Puerto Rico – English
Puerto Rico – Español
Virgin Islands

Number
1-800-630-2438
1-866-996-9463
1-800-496-9992
1-800-496-9993
1-800-496-9994

Text Telephones (TTY)
1-800-833-2438
1-800-462-8583

We sincerely regret any inconvenience or concern that this situation may cause you. We want you to know that we will
do our best, throughout your ownership experience, to ensure that your GM vehicle provides you many miles of
enjoyable driving.
Terry M. Inch
Executive Director
Global Connected Customer Experience
15827

Page 4 of 4

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4129
URGENT - DISTRIBUTE IMMEDIATELY
Date:

August 1, 2016

Subject: 15827 - Customer Satisfaction
Emergency Vehicle Reduced Power
Models: 2012 Chevrolet Express, Silverado HD
2012 GMC Savana
Equipped with Duramax Diesel Engine (RPO LGH) and Ambulance
Upfitter (RPO YF2)
To:

All Chevrolet and GMC Dealers

General Motors is releasing Customer Satisfaction Program 15827 today. The
total number of U.S. vehicles involved is approximately 434. Please see the
attached bulletin for details.
Vehicles involved in this recall, despite prior service, may still have a condition in
which the emission control system as designed will limit speed under certain
conditions. In receiving prior service for the condition covered by GM Customer
Satisfaction Program 15801, some of these vehicles’ engine control modules
(ECM) were reprogrammed with a new calibration that still had emission control
system speed limitations. The EPA has approved General Motor’s request to
remove the emission control system speed limitations on these emergency
vehicles where applicable, and this new Customer Satisfaction Program is
intended to ensure that the limitations are removed.
Customer Letter Mailing
The customer letter mailing will begin on August 15, 2016.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated
August 2, 2016.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS