NHTSA ID Number: 10206743
Manufacturer Communication Number: PIT5648C
Summary
This Preliminary information communicates an issue with a “Trailer Disconnected Check Connection” message being displayed on the DIC without a trailer ever being connected. Engineering has released updated software calibrations for the Trailer Lighting Control Module.
2 Affected Products
Vehicles
Condition
Some customers may comment on a “Trailer Disconnected Check Connection”
message being displayed on the DIC without a trailer connected, message shown
below. In addition to this message, there may also be the following messages
depending on the vehicle content:
– Rear Park Assist Off
– Lane Change Alert System Off
– Rear Cross Traffic Alert Off
This condition is more likely to occur with colder ambient temperatures.
Cause
This concern could be caused by the Trailer Lighting Control Module software.
Correction:
To correct this concern, reprogram the Trailer Lighting Control Module (K68) with the latest software available in Tis2Web, per Service Update N192213550 – Trailer Integration Module Software Error.
SEOCONTENT-START
Bulletin No.: PIT5648C
Published date: 12/22/2021
Preliminary Information
PIT5648C Trailer Disconnected Check Connection Message on DIC
Without a Trailer Connected (Reprogram the Trailer Lighting
Control Module K68)
Models
Brand: Model: Model Years:
VIN:
Engine: Transmissions:
from to
Chevrolet
Silverado 1500 (New Model) 2019 All All All All
GMC Sierra 1500 (New Model) 2019 All All All All
Involved Region or Country North America
Additional Options (RPO) With U1D – Advanced Trailering System
Condition
Some customers may comment on a “Trailer Disconnected Check Connection”
message being displayed on the DIC without a trailer connected, message shown
below. In addition to this message, there may also be the following messages
depending on the vehicle content:
– Rear Park Assist Off
– Lane Change Alert System Off
– Rear Cross Traffic Alert Off
This condition is more likely to occur with colder ambient temperatures.
Cause This concern could be caused by the Trailer Lighting Control Module software.
Correction:
To correct this concern, reprogram the Trailer Lighting Control Module (K68) with the latest software available in
Tis2Web, per Service Update
N192213550 – Trailer Integration Module Software Error.
Additional information for false trailer detections:
The Trailer Lighting Control Module monitors the trailer tail lamp, trailer Rt stop/turn lamp, and trailer Lt
stop/turn lamp circuits to determine if a trailer is connected. If the Trailer Lighting Control Module detects
enough of a load on any one of these circuits, it may determine that a trailer has been connected. If
moisture/corrosions/etc. gets into either the trailer receptacle, or the Trailer Lighting Control Module connector,
or if anything is left plugged into the trailer receptacle, like trailer adapters with built in test-LEDs, it may cause the
module to think that a trailer is connected when there actually is not.
-Inspect and remove anything that has been left plugged into the trailer receptacle, such as a trailer adapter plug.
-Inspect the following areas for any moisture, corrosion, etc.:
The 7-way / 4-way trailer receptacle X88, located at the rear bumper.
The chassis harness connector X1 that plugs into the trailer receptacle X88.
The Trailer Lighting Control Module K68 connector.
Clean and dry, repair and/or replace any connection issues which have moisture/corrosion present.
This PI maybe converted to a bulletin shortly.
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 Trans. Type Net Item
9104343*
Verified Module Software or
Calibration Level: Module Programmed
with Same Level Software or
Calibration
0.2hr
ZFAT N/A
9104244*
Trailer Lighting Control Module
Reprogramming with SPS
0.3hr
* To avoid warranty transaction rejections, the SPS Warranty Claim Code must be entered when submitting this
transaction. Note that if multiple modules are reprogrammed, all claim codes must be entered with a comma
separating each code.
Version History
Version 4
Modified
01/07/2019 – Created on
02/12/2019 – Admin details added
03/01/2019 – Update to add repair and warranty information
03/11/2019 – Update the Correction and Warranty sections to reference
service update N192213550.
SEOCONTENT-END
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5648C
Published date: 12/22/2021
MC-10206743-9999.pdf 390.255KB
NHTSA ID Number: 10156921
Manufacturer Communication Number: PIT5648C
Summary
This Preliminary information communicates an issue with a “Trailer Disconnected Check Connection” message being displayed on the DIC without a trailer ever being connected. Engineering has released updated software calibrations for the Trailer Lighting Control Module.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5648C
Published date: 03/11/2019
NHTSA ID Number: 10154294
Manufacturer Communication Number: PIT5648A
Summary
This Preliminary information communicates an issue with a “Trailer Disconnected Check Connection” message being displayed on the DIC without a trailer ever being connected. Engineering is aware of the issue and working on a correction.
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT5648A
Published date: N/A
MC-10154294-9999.pdf 386.571KB
Reprogramming
GM Diagnostic/Programming (TIS2Web)
Approved J2534 Device with TIS2WEB can reprogram 1996 and later All GM Modules.
To obtain the latest electronic controller calibration information for your vehicle, go to https://tis2web.service.gm.com/tis2web and enter the vehicle's 17 character Vehicle Identification Number (VIN) and select 'Get CAL ID’.
You can then compare the latest part number with the actual number installed on the vehicle to determine if a reprogram is needed.
The Service Programming System (SPS) application is part of the TIS2Web system. To program an ECU, the SPS application must communicate with the vehicle control modules using the proper J2534 programming interface tool.
The Tech 2 supports model years 1996 and beyond. With the addition of the CAN Diagnostic Interface (CANdi) module, Tech 2 is fully backward compatible with current Tech 2 functionality and operates transparently when diagnosing non-CAN-equipped vehicles.
Servicing the next generation Global A vehicles will require the diagnostic software, GDS2, Global Diagnostic System 2 running on a local PC device while the MDI is connected to the vehicle. The GM MDI is the Global Diagnostic tool for future vehicles starting with Global A vehicles.
The GM MDI was introduced in the fall of 2007 for Pass-Thru programming and offers faster programming speed. It can be used to perform Pass-Thru programming on all vehicles built since 1996 and into the future. Click here to view a list of GDS supported vehicles.
www.acdelcotds.com
- Advanced VCI Box, Industry-leading J2534 Pass-Thru Technology: This J2534 Pass-Thru Programmer is designed espically for technicians, independent shop owners, and DIY enthusiasts, enables fast, reliable computer-based programming. It supports all J2534 protocols—including the latest DoIP and CAN FD—ensuring full compatibility with both legacy and next-generation vehicles.
- High-Speed OEM-Level Diagnostics & Programming: Unlock true OEM functionality with comprehensive system diagnostics, guided troubleshooting, coding, adaptations, resets, and programming—all designed to slash repair time. This all-in-one tool eliminates the need for multiple OEM devices, boosting efficiency and cutting costs. Equipped with High-Speed USB, it delivers 10x more data per second than competing solutions
- Coverage for 17 Car Brands & Ultra Reliability: Works seamlessly for Chrysler, for Ford(Forscan), for GM, for Nissan, for Toyota, for Honda, for Subaru(SSM4), for Land Rover/Jaguar, for Volvo, for Wuling, for Volkswagen, for Mercedes-Benz, and for BMW. Backed by over 10000 real vehicle tests and benefit from a wealth of practical experience, this OEM reprogramming tool guarantees stable and exceptional performance
- User-Friendly RLink Platform & Expert Support: TOPDON’s proprietary driver management platform offers a clean interface and lifetime free updates. Access a rich library of real-world case studies to stay ahead of the curve. Backed by a support team with 10+ years of J2534 and automotive repair experience, we provide one-on-one assistance to resolve any technical issue.
- 6.6 ft USB-C Cable & Portable Storage Case: The RLink J2534 diagnostic tool features a 6.6ft USB 2.0 Cable and a 1.2 ft OBDII Extension Cable, allows to connection your computer easily outside the vehicle. The included handled carry case offers easy portability, storage, and hanging options—keeping your gear clean and ready to go, anywhere.
- J2534 Pass-Thru Programmer: TOPDON RLink J2534 is an advanced diagnostic and reprogramming tool that support all J2534 protocols, as well as D-PDU, CAN-FD and DoIP, ensuring compatibility with a wide range of modern vehicles. It offers extensive versatility with support for over 18 major automotive brands, including Chrysler, Ford, GM, Nissan, Toyota, Honda, Subaru, Land Rover/Jaguar, Volvo, Wuling, Volkswagen/Audi, Mercedes-Benz, and BMW. NOTE: Not compatible with Ford IDS diagnostic software
- All-in-One OEM Diagnostics: This J2534 ECU programming tool elevates your automotive repair capabilities to new heights by delivering complete OEM diagnosis. Boasting comprehensive full-system diagnostics, intuitive repair guides, advanced ECU programming and coding, common reset services, a vast library of repair information and more, this all-in-one solution empowers technicians to effortlessly tackle complex vehicle issues with ease. *Not compatible with 24V vehicles
- Proven Performance You Can Trust: Backed by over 10000 real vehicle tests and benefit from a wealth of practical experience, this OEM reprogramming tool guarantees stable and exceptional performance. Supported by TOPDON's dedicated technical experts with in-depth knowledge of both auto repair and J2534 Pass-Thru programming, the RLink J2534 provides prompt and professional assistance, ensuring a smooth setup and reliable compatibility
- Integrated Excellence, Always Up-to-Date: Featuring the exclusive RLink Platform to provide a streamlined experience with one-click driver installation and management, ensuring flawless integration with your OE software, maintaining the original performance quality. The built-in operation guide makes mastering OE software quick and easy, so you can get started right away. Plus, with lifetime free updates, your diagnostics will stay current with the latest drivers and innovations
- Efficiency Meets Versatility: Engineered to support three CAN channels simultaneously - CAN FD and CAN-CC included, giving you the edge in fast troubleshooting. To perfectly synchronized with the OE software, please diagnose with active subscriptions and make sure your computer system is running a compatible 64-bit Windows version (7, 8, 10 or later) to fully leverage the power of RLink J2534. *We don't provide extra OE software
- Dual WiFi & 10.1" Touchscreen: Provides a stable, high-speed wireless link 3x faster than bluetooth, and a responsive, professional interface. Topdon ONE obd2 scanner diagnostic tool ensures smooth, non-lagging diagnostic scan, boosting mechanic efficiency
- J2534 Pass-Thru Support: The included ONE VCI supports the J2534 standard, allowing it to function as a pass-thru device when paired with OEM diagnostic software.Through TOPDON’s RLink platform, technicians can perform dealer-level coding, expanding in-house capabilities without investing in multiple factory automotive scan tools
- OE Topology Mapping: Visualize the vehicle’s ECU network exactly as it’s built.Zoom, pan, and highlight specific modules to pinpoint component issues with precision.Topology mapping displays real-time communication between modules
- 50 Plus Service Functions: Covers high-demand services like ADAS calibration, DPF regen, TPMS reset, ABS bleed, and throttle adaptation.Expands your service menu, allows you to charge premium rates, and turns away zero jobs due to lack of tooling. Vehicle-specific functionality may vary
- Advaned ECU Coding: 10 of the most serviced brands in North America, including full ECU coding and flash hidden support for BMW, VW, Au-di, Benz, Porsche, Toyota, Ni ssan and more. Enables module replacement, feature customization, and personal settings with automatic backup or restore.Lets your shop safely offer high-margin customization services, attracting more customers and boosting profit
Last update on 2026-06-07 / Affiliate links / Images from Amazon Product Advertising API
This product presentation was made with AAWP plugin.