21-NA-244

Bulletin No.:
Service Bulletin
Date:
21-NA-244
January, 2023
TECHNICAL
Subject:
No Fob Detected Message on Driver Information Center (DIC) with No Crank/No Start
This bulletin replaces PIT5841A. Please discard PIT5841A.
Model Year:
Brand:
Model:
Buick
Envision
2021
CT4
2020
CT5
2020
Escalade
Models
2021
Corvette
2021
Suburban
2021
Tahoe
2021
Yukon
Models
2021
Cadillac
Chevrolet
GMC
from
VIN:
to
from
to
2022
All
All
Engine:
Transmission:
All
All
Involved Region or Country
North America
Condition
Some customers may comment on a No Crank / No Start condition with a "No Fob
Detected" message on the DIC. The Remote Keyless Entry (RKE) key fob will also not be
detected in the backup pocket. Key fobs will work actively (button press) but not
passively. There are no current passive antenna or Immobilizer DTCs set in the Body
Control Module (BCM). The vehicle will have battery power (battery state of charge above
12 volts) but will not power mode to the RUN or Accessory position, which will not allow
the transmission to be shifted from Park. Also, the parking brake may be engaged and
not be able to be released.
Cause
It has been determined that an internal BCM fault causes the fobs to not be recognized
and loss of immobilizer.
Copyright 2023 General Motors LLC. All Rights Reserved.
Page 2
January, 2023
Correction
Important: This technical service bulletin (TSB) can
only be completed by certified repair facilities who have
met all specific training, tool and equipment
requirements pertaining to the vehicle Brand and Model
serviced. Repairs must be performed by a technician
who has successfully completed the required training.
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.
If you encounter a vehicle with the above concern,
perform the following steps:
1. Navigate to GDS2 > Module Diagnostics> [K9]
Body Control Module > Identification Information >
Identification Information.
Verify that the vehicle's BCM Base Model Part
Number (BMPN) is eligible for this bulletin.
BMPNs eligible for this bulletin:
• 13535059
• 13535064
• 13536374
• 13536376
• 13540162
• 13540616
• 13540485
If your BMPN is NOT found on the list, stop
here and follow SI diagnostic procedure. If your
BMPN is on this list, please proceed on to the
next step.
2. Verify that the Active RKE functions are working for
all transmitters (example: Locking/Unlocking/Horn/
Trunk and Remote Start).
3. Verify ALL Passive RKE functions are inoperative
for both transmitters.
Bulletin No.: 21-NA-244
4. Verify Low Frequency (LF) “Passive” Antennas
ARE NOT transmitting by using the Service Tool
EL-52545.
5. Verify that the Transmitters ARE NOT responding
to the Passive Challenge with the Service Tool
EL-52545, without pressing any buttons on the
transmitters.
6. Is the vehicle's battery above 12V?
7. There should be no current antenna or immobilizer
DTCs set in the BCM.
8. With both transmitters outside of the vehicle,
attempt to change the power mode by pressing the
start stop switch once every 3 seconds, 5 times.
Check for DTCs in the BCM. There should be no
current antenna or immobilizer DTCs set after
performing this step.
If questions 1-7 can all be answered as “YES”, replace
the BCM.
Refer to Service Information / Keyless Entry System
Malfunction (Example Document ID# 5606149) for
additional diagnostic procedures.
Note: It may be possible to recover the vehicle from
this condition by performing a battery disconnect /
reset, allowing the vehicle's modules to completely
power down. If the vehicle cannot be recovered and
must be towed, ensure proper towing procedures are
followed including the use of wheel dollies and flatbed
towing (Reference SI Document ID# 5500849).
Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor
Operation
Description
Labor Time
2887308*
Diagnose Inoperative Key
Fobs, Replace BCM, and
Program BCM
1.4 hrs
*This is a unique Labor Operation for bulletin use only.
Version
4
Modified
Released November 04, 2021
Revised July 20, 2022 – Added the 2022 Model Year.
Revised October 17, 2022 – Added the Important statements under Correction and
updated Steps 1-3.
Revised January 17, 2023 – Updated the Steps under Correction.
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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