23-NA-153

Bulletin No.:
Service Bulletin
Date:
23-NA-153
September, 2023
INFORMATION
Subject:
Information on Sag or Hesitation on Acceleration
This bulletin replaces PIP4112S. Please discard PIP4112S.
Brand:
Buick
Cadillac
Chevrolet
GMC
Model:
GM
Passenger
Cars and
Trucks
Model Year:
VIN:
from
to
from
to
2000
2024
—
—
Involved Region or Country
Condition
Engine:
Transmission:
—
—
North America, Europe
Some customers may comment on a sag or hesitation when accelerating under the
following conditions:
• When coasting at low speeds of less than 24 km/h (15 mph) with a closed throttle and
then aggressively applying the throttle.
– Examples of this maneuver include a rolling stop or a lane change maneuver. In this
type of maneuver, even though the accelerator is applied aggressively, the throttle
blade is opened slowly for up to 0.7 seconds to help minimize driveline lash and
clunking.
– Also, in a vehicle equipped with an automatic transmission when making a hard,
complete stop with a closed throttle, immediately followed by an aggressive throttle
opening, the transmission downshifts may not be completed by the time the throttle is
opened.
– As a result, approximately 0.5 seconds of ″zero″ torque may be commanded to allow
the shift to first gear to occur.
Customers may also comment on a sag or hesitation while cruising at highway speeds
and then aggressively increasing the throttle, forcing a down-shift.
⇒ This type of driving maneuver may result in approximately 0.5 seconds of ″
zero″ torque being commanded to allow the downshift to complete.
Correction
Copyright 2023 General Motors LLC. All Rights Reserved.
All of the above conditions are a result of Torque Management, and all of these conditions
should be considered normal. No repairs should be attempted.
Page 2
September, 2023
Bulletin No.: 23-NA-153
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
Version
1
Modified
Released September 01, 2023
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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION