18NA341

File in Section:
Bulletin No.:
Service Bulletin
Date:
18-NA-341
November, 2018
TECHNICAL
Subject:
Brand:
Cadillac
Chevrolet
Malfunction Indicator lamp (MIL) Illuminated - DTC P2096 or P2098
Model:
Model Year:
VIN:
from
to
2018
2018
from
Engine:
Transmission:
to
ATS
CTS
July 24, 2018
LGX
Camaro
Involved Region or Country
North America
Condition
Some customers may comment that the MIL is illuminated.
Some technicians may find one of the following DTCs set in the Engine Control
Module (ECM):
• P2096: Post Catalyst Fuel Trim System Low Limit Bank 1
• P2098 :Post Catalyst Fuel Trim System Low Limit Bank 2
Cause
This condition may be caused by the post O2 sensor diagnostic not adapting quick
enough in a decel situation which causes the O2 sensor voltage to remain high and allow
a false rich air/fuel ratio at lower RPM.
Correction
If vehicle exhibits this condition, program the ECM to the latest software and calibration
available on TIS2WEB.
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 K20 Engine Control Module: Programming and
Setup in SI.
Parts Information
No parts are required for this repair.
Copyright 2018 General Motors LLC. All Rights Reserved.
Page 2
November, 2018
Bulletin No.: 18-NA-341
Warranty Information
For vehicles repaired under the Emission coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor Operation
Description
Labor Time
4086678*
Engine Control Module Reprogramming with SPS
0.5 hr
*This is a unique Labor Operation for Bulletin use only.
Version
1
Modified
Released November 13, 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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