17-NA-078

Bulletin No.:
Service Bulletin
Date:
17-NA-078
February, 2023
INFORMATION
Subject:
Brand:
Chevrolet
Information on Corvette and Camaro Exhaust Tone During Wide Open Throttle While in
Sport or Track Modes
Model:
Model Year:
VIN:
from
to
Camaro
2015
2023
Corvette
2015
2023
from
to
—
Engine:
Transmission:
6.2L, 5.5L
(RPOs LT1, LT2
Equipped with
NPP, LT4, LT5
or LT6)
All
Involved Region or Country
North America, Europe, Japan, Middle East
Condition
Some customers may comment that they hear a "pop" or "backfire" sound from the
exhaust while performing a wide open throttle maneuver while in Sport or Track driving
modes.
Cause
The exhaust sound heard during the wide open throttle maneuver is normal.
Correction
No repairs should be performed if there are no diagnostic codes, and the exhaust sound
that the customer noticed goes away when the driver mode is selected to any other driver
mode other than Sport or Track.
Note: The C8 Generation Corvettes may experience the exhaust sound mentioned in the
bulletin when the following driving modes are selected; Sport, Track, MY Mode and Z
Mode depending on the personalization of the engine sound.
Parts Information
No parts are needed for this concern.
Customer Information
Please communicate to the customer this condition is a
normal characteristic of their vehicle. It will not impact
the designed performance or reliability of the vehicle.
Please share this information with the customer,
including a copy of this bulletin.
Version
5
Modified
Revised November 2, 2018 – Added the 2018 and 2019 Model Years and the LT1 and
LT5 engine RPOs.
Revised September 18, 2020 – Added the 2020 Chevrolet Corvette, 2020-2021
Chevrolet Camaro, updated the Engine column, updated the Involved Region or Country
section and added a Note to the Correction.
Revised July 29, 2022 – Updated the Model Years to 2023.
Revised February 15, 2023 – Added the 5.5L (RPO LT6) engine and updated the Note in
Correction.
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 equipment, tools, 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 GM dealer for information on whether your vehicle may benefit from the
information.
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