18NA121

File in Section:
Service Bulletin
-
Bulletin No.:
18-NA-121
Date:
April, 2018
TECHNICAL
Subject:
Malfunction Indicator Lamp (MIL) Illuminated, 1st Gear and/or Reverse Only with No
Upshift, Vehicle won’t Go Above 40 km/h (25 mph), 1-2 Shifts Feels Like a Momentary
Tie Up, DTC P2731 Set
Brand:
Model:
Chevrolet
Cruze
Equinox
Malibu
Traverse
Model Year:
from
2018
VIN:
to
from
Engine:
Transmission:
to
Equipped with 9
Speed
Automatic
Transmission
(RPOs M3V,
M3E, M3D)
2018
Involved Region or Country
North America and N.A. Export Regions
Condition
Some customers may comment on one or more of the following conditions:
• Malfunction indicator lamp (MIL) illuminated.
• 1st gear and/or reverse only with no upshift.
• Vehicle won’t go above 40 km/h (25 mph).
• 1-2 shifts feels like a momentary tie up.
Some technicians may find the following DTC set in the TCM:
• P2731 – Transmission Control Solenoid Valve 6 Performance set in history
Cause
This condition may be caused by software anomaly.
Correction
Replace the control valve body spacer plate and update the transmission control module
with the latest software available.
Service Procedure
Important: Stable battery voltage is critical during
programming. Any fluctuation, spiking, over voltage or
loss of voltage will interrupt programming. Install the
EL-49642 SPS Programming Support Tool (GM Dealer
Equipment Item #PSC-550) 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.
Refer to Control Valve Body Replacement and
Transmission Control Module: Programming and Setup
in SI.
Copyright 2018 General Motors LLC. All Rights Reserved.
Parts Information
Causal
Part
X
Description
Part
Number
PLATE ASM,
C/VLV BODY
SPCR (KIT)
24293402
24293403
Qty
1
Page 2
April, 2018
Bulletin No.: 18-NA-121
Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor
Operation
8480718*
Description
Labor Time
Valve Body Spacer Plate
Replacement and
Transmission Control
Module Reprogramming
with SPS
4.0 hrs
*This is a unique Labor Operation for Bulletin use only.
Version
1
Modified
Released April 18, 2018
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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