GM Bulletin No.: 13254
Date: August 2014

Service Bulletin

SERVICE UPDATE
SUBJECT:

Service Update for Inventory and Customer Vehicles
Rough Engine Operation, DTC P16A1, MIL, Reduced Power Mode
Expires with Base Warranty

MODELS:

2014 Chevrolet Silverado
2014 GMC Sierra
Equipped with 5.3L V8 Engine (L83)

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 install a new throttle body assembly and perform
the throttle body learn procedure on certain 2014 model year Chevrolet Silverado and GMC
Sierra vehicles equipped with a 5.3L V8 engine (L83). The throttle position sensor may cause
the engine to run rough, set a P16A1 DTC, illuminate the malfunction indicator lamp and/or an
Engine Reduced Power message. If this occurs, it could result in reduced engine power.
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.

Page 2

August 2013

Bulletin No.: 13254

PART INFORMATION
Parts required to complete this service update are to be obtained from General Motors
Customer Care and Aftersales (GMCC&A). Please refer to your “involved vehicles listing”
before ordering parts. Normal orders should be placed on a DRO = Daily Replenishment Order.
In an emergency situation, parts should be ordered on a CSO = Customer Special Order.
Part Number
12617792

Description
THROTTLE BODY ASM

Quantity/Vehicle
1

SERVICE PROCEDURE
1. Remove throttle body assembly from the vehicle. Refer to Throttle Body Assembly
Replacement in SI.
2. Install a new throttle body assembly. Refer to Throttle Body Assembly Replacement in SI.
3. Perform a throttle body idle learn procedure. Refer to Q38 Throttle Body: Throttle/Idle Learn
in SI.
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
9100123

Description
Throttle Body Replacement (inc. throttle body/idle learn)

Labor
Time
0.4

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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