NHTSA ID Number: 11025974
Manufacturer Communication Number: 24-NA-166
TSB/Document Date: 2025-12-02
Summary
This technical bulletin provides repair information to correct a customer concern of DTC C1171 C1172 C1173 C1174 Tire Pressure Monitor Sensor Unable to Relearn Ethernet Cable Overlay for TCP OnStar Module.
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TSB/Document ID: 24-NA-166
Replacement Service Bulletin Number:
MFR Communication Date: 2025-11-07
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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Bulletin No.: 24-NA-166
Service Bulletin
Date: November, 2025
TECHNICAL
Subject:
DTC C1171 C1172 C1173 C1174 Tire Pressure Monitor Sensor Unable to Relearn
Ethernet Cable Overlay for TCP OnStar Module
This Service Bulletin replaces PIT6188E. Please discard all versions of PIT6188.
Brand:
Model:
Model Year:
from
Enclave
2025
Build Date:
to
from
Engine:
to
2026
Traverse
2024
2026
Acadia
2024
2026
—
SOP
October 29,
2025
LK0
—
—
Involved Region or Country
North America, Middle East
Condition
Some customers may comment on a Tire Pressure lamp illuminated and/or message on
the dash. The dealer may also not be able to perform the tire pressure learn for one or
both front tires.
Note: If only the rear Tire Pressure Monitors are setting, then it is not related to this issue.
Technicians may find one or more of the following DTCs:
DTCs C1171, C1172, C11723, and/or C1174.
Important: This can cause fob-related issues when accompanied by one or more of the
DTCs listed above. If the customer is having intermittent fob issues and setting TPM codes, it is possible the new overlay in this procedure will resolve the fob concerns too.
Cause
The causes of the condition may be interference from the OnStar module due to an issue
grounding from the X7 connector on the Ethernet cable. This issue can also be
intermittent.
Correction
Replace Ethernet cable with overlay. Refer to the Service Procedure below.
Service Procedure
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.
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.
1. Once confirmed the TPM sensors cannot be learned, gain access to the rear headlining trim panel. DO NOT
remove the headlining trim panel, only lower it to gain access. Refer to Headlining Trim Panel Replacement in
SI. Disconnect the X7 connector and attempt to learn the TPM sensors.
Copyright 2025 General Motors. All Rights Reserved.
Page 2
November, 2025
Bulletin No.: 24-NA-166
6720400
If the TPM sensors are able to learn, continue with Ethernet Cable replacement. Otherwise follow SI.
2. Transfer housing connectors.
3. Fold the 3rd row seats forward.
4. Remove the Rear Compartment Floor Stowage Compartment Divider. Refer to Rear Compartment Floor
Stowage Compartment Divider Replacement in SI.
5. Remove the Right-Hand Front Side Door Sill Garnish Molding. Refer to Front Side Door Sill Garnish Molding
Replacement in SI.
6. Remove the Right-Hand Rear Side Door Sill Garnish Molding. Refer to Rear Side Door Sill Garnish Molding
Replacement in SI.
7. Loosen the Center Pillar Lower Trim Panel from the vehicle. Refer to Center Pillar Lower Trim Panel
Replacement in SI.
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November, 2025
Page 3
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8. Fold and raise up the Right-Hand Rear seat. DO NOT REMOVE.
9. Remove the Right-Hand Quarter Upper and Lower Rear Trim Panel. Refer Quarter Lower Rear Trim Panel
Replacement (Right Side) in SI.
10. Loosen the Left-Hand Quarter Upper Trim Panel. Refer to Quarter Upper Trim Panel Replacement in SI.
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November, 2025
Bulletin No.: 24-NA-166
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11. Locate the X205 Ethernet Cable in the Right-Hand Front Passenger Compartment and disconnect.
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Bulletin No.: 24-NA-166
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12. Locate the X7 Ethernet Cable at the Telematic Control Module and disconnect.
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Caution: Use care to terminate the correct connector.
Note: The existing Ethernet cable is bundled with the body harness. The service ethernet cable will be routed next to
the body harness. The terminals must be removed from the existing ethernet cables to ensure they are not used in
future repairs.
13. Cut BOTH ends off the existing Ethernet Cable at X205 and X7 of the Telematic Control Module and wrap PVC
Electrical tape around both ends of the cable to prevent future use. The unused cable can remain bundled with
the body harness.
Important: Keep both ends and connectors. The housing will need to be transferred to the new cable.
14. Transfer both housings to the new cable. The new cable will come without the housings.
Bulletin No.: 24-NA-166
November, 2025
Page 9
6720419
15. Transferring the X205 housing.
15.1. Remove the rear clip by releasing both clips from the outer housing and remove it.
Important: Save this clip for the new cable.
6720403
Empty housing shell. Circle in red is the 1 release tab. Arrow shows the direction the tab needs to be
pressed to release the cable, moving it away from the middle.
Note: Very minimal pressure is needed.
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November, 2025
Bulletin No.: 24-NA-166
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The X205 housing tab is very difficult to see with the cable installed.
6720432
Following the middle ridge to the back, this is where the housing locks onto the cable.
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November, 2025
Page 11
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6720401
The best way to get to the release tab is to follow the cable’s middle ridge to the back (do not ride the wall
of the housing or you will miss it, use the cable’s middle ridge to guide you). Using light pressure, press
away from the center towards the housing to release. Make sure to apply light pulling pressure to the
back of the cable so it can release while depressing the tab.
Note: Slide off the seal and save it for the new cable.
Page 12
November, 2025
Bulletin No.: 24-NA-166
6720420
16. Transferring the X205 housing.
Here is the empty housing shell. Circle in red is the 1 release tab. The arrow shows the direction the tab needs
to be pressed to release the cable. Moving it away from the middle.
Note: Very minimal pressure is needed.
6720422
The X7 housing tab is very difficult to see with the cable installed.
Bulletin No.: 24-NA-166
November, 2025
Page 13
6720426
Following the middle ridge to the back, this is where the housing locks onto the cable.
6720425
Page 14
November, 2025
Bulletin No.: 24-NA-166
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The best way to get to the release tab is to follow the cable’s middle ridge to the back (do not ride the wall of the
housing or you will miss it, use the cable’s middle ridge to guide you.) Using light pressure, press away from the
center towards the housing to release. Make sure to apply light pulling pressure to the back of the cable so it
can release while depressing the tab.
6706059
17. Connect the Replacement Ethernet Cable the connector at X205.
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November, 2025
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Note: Replacement Ethernet Cable routing shown in Green.
Important: Use extreme care when handling the new service ethernet cables. Avoid kinks, sharp bends, pinch
points, and excessive wire tie tightness.
18. Begin to route the new Service cable starting at X205 and following the Body Wiring Harness running back
towards the Telematic Control Module. Use the diagrams above to reference cable routing.
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6706076
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19. Run the replacement Ethernet Cable through the body wiring harness clamshell and underneath the Front
Passenger Seat.
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20. Continue to route the replacement Ethernet Cable alongside the Body Wiring Harness in the rear passenger
compartment and up the C-Pillar.
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November, 2025
Bulletin No.: 24-NA-166
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November, 2025
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21. Continue to route the replacement Ethernet Cable following the Body Wiring Harness through the Rear HVAC
area.
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November, 2025
Bulletin No.: 24-NA-166
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Important: Ensure the replacement Ethernet Cable will have enough slack so that it is not pulling on the connector
at X7 of the Telematic Control Module. Failure to do so could damage the connector at the module.
22. Make a small loop to remove some of the excess cable and secure with a wire tie. Ensure to leave plenty of
slack so that the cable will not pull on the connector at X7 of the Telematic Control Module.
Bulletin No.: 24-NA-166
November, 2025
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Page 26
November, 2025
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23. Follow the Body Wiring Harness up the rear of the vehicle and into the rear of the headlining.
Bulletin No.: 24-NA-166
November, 2025
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Note: If there is not an adequate amount of slack in the cable return to the loop made in Step 17 and gain extra
slack from the loop. Resecure the loop with a wire tie if necessary.
Important: Ensure the replacement cable has plenty of slack and is not pulling on the cable connector plug. Failure
to do so could damage the connector at the module.
24. Connect the replacement cable into X7 of the Telematic Control Module. Ensure that the cable has enough
slack left to not pull on the X7 connector.
Page 28
November, 2025
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Important: Avoid excessive wire tie tightness on the replacement cable when securing to the Body Wiring Harness.
25. Add one wire tie around the old cable harness and the new replacement cable near the existing harness tie
down. This will aid in securing the connector into the X7 Terminal of the Telematic Control Module.
Important: Avoid excessive wire tie tightness on the replacement cable when securing on the Body Wiring Harness.
26. Secure the replacement cable to the Body Wiring Harness with wire ties. Ensure the replacement cable does
not move/rattle.
27. Reinstall the Headliner as necessary. Refer to Headlining Trim Panel Replacement in SI.
28. Reinstall the Left-Hand Quarter Upper Trim Panel. Refer to Quarter Upper Trim Panel Replacement in SI.
29. Reinstall the Right-Hand Quarter Upper and Lower Trim Panel. Refer to Quarter lower Rear Trim Panel
Replacement (Right Side) in SI.
30. Reposition the Right-Hand Rear Seat as necessary.
31. Reinstall the Right-Hand Center Pillar Upper and Lower Trim Panel. Refer to Center Pillar Lower Trim Panel
Replacement in SI.
32. Reinstall the Right-Hand Rear Side Door Sill Garnish Molding. Refer to Rear Side Door Sill Garnish Molding
Replacement in SI.
33. Reinstall the Right-Hand Front Side Door Sill Garnish Molding. Refer to Front Side Door Sill Garnish Molding
Replacement in SI.
34. Reinstall the Rear Compartment Floor Stowage Compartment Divider. Refer to Rear Compartment Floor
Stowage Compartment Divider Replacement in SI.
35. Fold the 3rd row seat back as necessary.
Bulletin No.: 24-NA-166
November, 2025
Page 29
Parts Information
Causal
Part
Description
X
Cable, Body
Wiring Harness
Modular Pair
Part
Number
Qty
26501515
1
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
2086678*
Ethernet Cable Overlay X7
2.4 Hrs.
*This is a unique Labor Operation for bulletin use only.
Version
7
Modified
Released September 05, 2024
Revised October 10, 2024 – Removed the GMC Canyon, Hummer EV and Savana,
added breakpoint and Middle East.
Revised October 25, 2024 – Added note to Condition Section.
Revised January 13, 2025 – Added the 2025 Model Year.
Revised May 01, 2025 – Updated the Concern section.
Revised October 21, 2025 – Added the 2026 Model Year to all vehicles.
Revised November 07, 2025 – Added a build date for vehicles.
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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