NHTSA ID Number: 10199276
Manufacturer Communication Number: 21NA114
TSB/Document Date: 2021-07-19
Summary
This technical bulletin provides repair information to correct a customer concern of Fuel Gauge accuracy issues.
Service Bulletin
Bulletin No.:
21-NA-114
Date:
May, 2021
TECHNICAL
Subject:
Fuel Gauge Accuracy
Brand:
Model:
Model Year:
VIN:
to
Colorado
2020
2021
LGZ LCV
Canyon
2020
2021
LGZ LCV
Involved Region or Country
from
Engine:
from
to
United States, Canada, Mexico, GM Korea Company
Additional Options (RPOs)
Condition
Some customers may comment on one or more of the following concerns:
• Fuel gauge comes off full quickly, after only a few miles driven
• The Fuel Range drops rapidly after only a few miles driven after filling the tank
• The Low Fuel Warning comes on too early
• Cannot put the full amount of fuel in the tank when filling after the low fuel warning
comes on
Cause
The cause of the condition may be a software issue causing a variance in the way the
fuel gauge displays the current level
Correction
Reprogram the Engine Control Module. Updated software has been released to correct
these issues.
Service Procedure
Caution: Before downloading the update files, be sure
the computer is connected to the internet through a
network cable (hardwired). DO NOT DOWNLOAD or
install the files wirelessly. If there is an interruption
during programming, programming failure or control
module damage may occur.
Note: Carefully read and follow the instructions below.
•
•
Ensure the programming tool is equipped with the
latest software and is securely connected to the
data link connector. If there is an interruption
during programming, programming failure or
control module damage may occur.
Stable battery voltage is critical during
programming. Any fluctuation, spiking, over
voltage or loss of voltage will interrupt
programming. Install a GM Authorized
Programming Support Tool to maintain system
voltage. Refer to www.gmdesolutions.com for
further information. 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.
Copyright 2021 General Motors LLC. All Rights Reserved.
•
Follow the on-screen prompts regarding ignition
power mode, but ensure that anything that drains
excessive power (exterior lights, HVAC blower
motor, etc) is off
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.
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May, 2021
Bulletin No.: 21-NA-114
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Bulletin No.: 21-NA-114
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Page 3
5431207
Important: Techline Connect and TIS2WEB screens
shown above.
Important: If the same calibration/software warning is
noted on the TLC or SPS Summary screen, select OK
and follow screen instructions. After a successful
programming event, the WCC is located in the Service
Programming System dialogue box of the SPS
Summary screen. No further action is required.
Refer to the Warranty section of the bulletin.
Important: When programming a module in GM’s new
Vehicle Intelligence Platform, or VIP, the power mode
(ignition) needs to be off or errors may occur. This
involves the 2020 Chevrolet Corvette, Cadillac CT5 and
CT4, as well as the upcoming full-size Chevrolet, GMC,
Cadillac SUVs and Buick Envision. Serial Data
Message Authentication also needs to have the
ignition off.
1. Reprogram the Engine Control Module. Refer to
K20 Engine Control Module: Programming and
Setup in SI.
Page 4
May, 2021
Bulletin No.: 21-NA-114
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5431209
Bulletin No.: 21-NA-114
May, 2021
Page 5
Note: The screenshots above are an example of
module programming and may not be indicative of the
specific module that is being programmed. Module
selection and VIN information have been blacked out.
Important: To avoid warranty transaction rejections,
you MUST record the warranty claim code provided on
the SPS Warranty Claim Code (WCC) screen shown
above on the job card. Refer to callout 1 above for the
location of the WCC on the SPS screen
2. Record SPS Warranty Claim Code on job card for
warranty transaction submission.
Warranty Information
Important: Warranty coverage code E2 applies for this
module programming event. ECM reprogramming is
covered for 8 years/80,000 miles (U.S.) or 8 years/
130,000 km (Canada).
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
*2887318
Engine Control Module Reprogramming with SPS for Fuel
Gauge Accuracy
0.3 hr
*This is a unique Labor Operation for Bulletin use only.
Important: **To avoid warranty transaction rejections, carefully read and follow the instructions below:
• The Warranty Claim Code must be accurately entered in the “SPS Warranty Claim Code” field of the transaction.
• When more than one Warranty Claim Code is generated for a programming event, it is required to document all Warranty
Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the “SPS Warranty Claim
Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided by
SPS/SPS2.
Warranty Claim Code Information Retrieval
If the SPS Warranty Claim Code was not recorded on
the Job Card, the code can be retrieved in the SPS
system as follows:
1. Open TLC/TIS on the computer used to program
the vehicle.
2. Select and start SPS/SPS2.
3. Select Settings.
4. Select the Warranty Claim Code tab.
The VIN, Warranty Claim Code and Date/Time will be
listed on a roster of recent programming events. If the
code is retrievable, dealers should resubmit the
transaction making sure to include the code in the SPS
Warranty Claim Code field.
Version
1
Modified
Released May 12, 2021
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
- Restores fuel economy
- Stabilizes ethanol
- Maximizes horsepower
- Improves responsiveness
- For use in both gasoline and diesel engines
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TSB/Document ID: 21NA114
Replacement Service Bulletin Number:
MFR Communication Date: 2021-05-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM:INSTRUMENT PANEL:FUEL GAUGE
MFR Component System:
MFR Component Subsystem:
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