18NA308

File in Section:
Bulletin No.:
Service Bulletin
Date:
18-NA-308
December, 2018
TECHNICAL
Subject:
Brand:
Cadillac
Ride Control Mode Will Not Extend Over Ignition Cycle from Sport Mode, Defaults
to Tour
Model:
ATS
CTS
Model Year:
VIN:
from
to
2018
2019
from
Engine:
to
Transmission:
3.6L
(RPO LGX)
Involved Region or Country
North America and N.A. Export Regions
Condition
Some customers may comment that the ride control mode will not extend over ignition
cycle from sport mode, defaults to tour mode.
Cause
This condition may be caused by a software anomaly.
Correction
Technicians should reprogram the engine control module (ECM).
Service Procedure
Warranty Information
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 K20 Engine Control Module: Programming and
Setup with SPS in SI.
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
2810075
Engine Control Module
Reprogramming with SPS
Use
Published
Labor
Operation
Time
Version
2
Modified
Released October 18, 2018
November 26, 2018 – Updated the Subject and added the ATS model.
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.
Copyright 2018 General Motors LLC. All Rights Reserved.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION