NHTSA ID Number: 11028937
Manufacturer Communication Number: PIT6394C
TSB/Document Date: 2026-02-23
Summary
A vehicle may have a service driver assist message and the technician cannot get the Long Range Radar learn procedure to complete. Tech is directed to drive a city route to complete the procedure.
Bulletin No.: PIT6394C
Service Bulletin
Date: February, 2026
PRELIMINARY INFORMATION
Subject:
Brand:
Service Driver Assist Message- B233B Long Range Radar Module Will Not
Complete Learn
Model:
Model Year:
from
VIN:
to
from
Engine:
to
Enclave
2024-2026
ALL
ALL
ALL
ALL
Envision
2024-2026
ALL
ALL
ALL
ALL
CELESTIQ
2025
ALL
ALL
BEV
ALL
CT5
2025-2026
ALL
ALL
ALL
ALL
Escalade
2025-2026
ALL
ALL
ALL
ALL
Escalade
ESV
2025-2026
ALL
ALL
ALL
ALL
ESCALADE
IQ
2025-2026
ALL
ALL
BEV
ALL
LYRIQ
2023-2026
ALL
ALL
BEV
ALL
OPTIQ
2025-2026
ALL
ALL
BEV
ALL
VISTIQ
2025-2026
ALL
ALL
BEV
ALL
XT4
2023-2025
ALL
ALL
ALL
ALL
Blazer EV
2024-2026
ALL
ALL
BEV
ALL
BrightDrop
400
2023-2026
ALL
ALL
BEV
ALL
BrightDrop
600
2023-2026
ALL
ALL
BEV
ALL
Equinox
2025-2026
ALL
ALL
ALL
ALL
Equinox EV
2024-2026
ALL
ALL
BEV
ALL
Silverado EV
2024-2026
ALL
ALL
BEV
ALL
Suburban
2025-2026
ALL
ALL
ALL
ALL
Tahoe
202-20265
ALL
ALL
ALL
ALL
Traverse
2024-2026
ALL
ALL
LK0
ALL
Acadia
2024-2026
ALL
ALL
ALL
ALL
Sierra EV
2024-2026
ALL
ALL
BEV
ALL
Terrain
2025-2026
ALL
ALL
ALL
ALL
Yukon
2025-2026
ALL
ALL
ALL
ALL
Yukon XL
2025-2026
ALL
ALL
ALL
ALL
Involved Region or Country
North America
Additional Options (RPO)
UGN
Copyright 2026 General Motors
. All Rights Reserved.
Page 2
February, 2026
Bulletin No.: PIT6394C
Condition
A vehicle may have a Service Driver Assist Message.
Code U3000 SYM 78 may be set.
When attempting to learn the B233B Long Range Radar Module (LRRM) it will time out
and not complete.
When attempting to restart the learn procedure a message "conditions not met" may be
found on the GDS2 screen.
Cause
Due to a new type of Long Range Radar being used the criteria to complete the learn has
changed.
In the past driving on a highway or two lane road with vehicles to follow was ideal but this
is not true for this type of radar.
Correction
Use the scan tool to enable the LRRM learn procedure following the steps in SI or on the scan tool.
Drive the vehicle in a city or urban type environment.
While it is ideal to continue moving, if stops are encountered it will not end the process, it will simply slow it down.
To complete the calibration, it helps if the radar detects multiple vehicle types, varying vehicle size, shape and height
will help trigger the necessary detections.
Following distance is also important. A following distance behind vehicles of 50-150 feet is best.
The radar must also detect stationary roadside objects that are close to the edge of the road.Objects that can help
include Mailboxes, Guardrails, Parked vehicles, Construction zones,
Trees and Buildings near the roadway.
Oncoming traffic can also help.
Below are situations that will prevent learning
No Objects or Vehicles.
6975451
Objects Too Far Away
Bulletin No.: PIT6394C
February, 2026
Page 3
6975452
Stationary Objects Too Small
6975455
Below are situations that are good for learning.
Variety of Different Sized Vehicles.
Oncoming vehicles.
Page 4
February, 2026
Bulletin No.: PIT6394C
6975456
Multiple Stationary Objects Near Road
6975457
Azimuth angle will increment up to 100%.
Elevation angle will not give any indication that it is completing. It will show" Incomplete" until it suddenly goes to
"Complete".
If the procedure times out before completing the calibration, the status will change from "learn in progress" to "Error".
This indicates that the module attempted to calibrate but did not detect all of the required conditions to successfully
complete.
Bulletin No.: PIT6394C
February, 2026
Page 5
If GDS displays a "loss of communication" message or an "error" message during the learn procedure using the
scan tool, navigate to B233B Forward Range Radar Sensor> Data Display> Calibration history> Learn status.
If the learn status shows in progress continue to drive the vehicle to complete the calibration. Do not click "learn"
again.
If the vehicle has been driven several times and the learn will not complete there is a reset button in GDS. Ensure
the vehicle is still in learn mode following the direction above and with the vehicle below 6 mph use the reset to start
the learn over again.
Note: This should only be used as a last resort as any progress that has been made will be erased and you will be
starting the procedure over again.
It is imperative that the vehicle be driven in this environment, the learn will not complete if driven on roads that
worked well in the past to perform a learn.
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
2880398*
Description
Labor Time
Long Range Radar Learn
Tips - This is to be used
with the learn procedure
time, not instead of it.
0.3 Hr.
*This is a unique Labor Operation for Bulletin use only.
Version
4
Modified
06/05/25 - Created on.
06/30/25-Updated to add photos and additional tips.
08/07/2025 - Updated Models and Correction.
02/17/26-Updated to add Envision and update to model year 2026
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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TSB/Document ID: PIT6394C
Replacement Service Bulletin Number:
MFR Communication Date: 2026-02-17
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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