PIT6456C Service Bulletin/Repair Instructions

Bulletin No.: PIT6456C
Service Bulletin
Date: February, 2026
PRELIMINARY INFORMATION

Subject:

Brand:
Key Fob Transmitter Buttons Inoperative

Model:
Model Year:

from
VIN:

to
from
Engine:
Transmission:
to
Buick
Enclave
2025-2026
All
All
All
All
Cadillac
Escalade
2023-2026
All
All
All
All
Cadillac
Escalade

ESV
2023-2026
All
All
All
All
Cadillac
OPTIQ
2025-2026
All
All
All
All
Cadillac
LYRIQ
2023-2026
All
All
All
All
Cadillac
VISTIQ
2026
All
All
All
All
Chevrolet
Corvette
2023-2026
All
All
All
All
Chevrolet
Equinox
2025-2026
All
All
All
All
Chevrolet
Silverado

1500
2023-2026
All
All
All
All
Chevrolet
Silverado

2500
2024-2026
All
All
All
All
Chevrolet
Silverado

3500
2024-2026
All
All
All
All
Chevrolet
Suburban
2023-2026
All
All
All
All
Chevrolet
Tahoe
2023-2026
All
All
All
All
Chevrolet
Traverse
2024-2026
All
All
All
All
GMC
Acadia
2024-2026
All
All
All
All
GMC
Sierra 1500
2023-2026
All
All
All
All
GMC
Sierra 2500
2024-2026
All
All
All
All
GMC
Sierra 3500
2024-2026
All
All
All
All
GMC
Terrain
2025-2026
All
All
All
All
GMC
Yukon
2023-2026
All
All
All
All
GMC
Yukon XL
2023-2026
All
All
All
All
Involved Region or Country
North America
Condition
A customer may comment that one of their key fobs does not function, all fob buttons are

inop. The fob will work passively for unlocking and allows the vehicle to start as normal

when in the vehicle. Any additional fobs learned to the vehicle function normally.
Cause
The cause of this condition could be the key fob transmitter being out of synchronization

with the Body Control Module.
Correction

Note: Do not replace Key fobs or the K9 Body Control Module for this concern.
Copyright 2026 General Motors. All Rights Reserved.
Page 2
February, 2026
Bulletin No.: PIT6456C
Confirm the customer concern and check the key fob battery by verifying the fob output is above 20% using

the EL-52545 signal strength meter after pressing a fob button ten times in a row.

After verifying the fob battery is good, use GDS2 and navigate to Module Diagnostics > Body Control Module > Data

Display > Keyless Entry Data list and view parameter "Synchronization Counter." Press any fob button and see if

the Synchronization Counter increases by one count for each button press. If the counter is increasing but the

vehicle is not responding to any of the button presses, then the fob is out of sync with the Body Control Module. To

bring the fob back in sync with the BCM, repeatedly press any fob button on the affected fob until the vehicle begins

to respond to the button presses. This may take up to 255 fob button presses.

If this procedure does not correct the concern, the bulletin does not apply and follow SI diagnostics.
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

2081378*
Description
Labor Time
Key Fob Synchronization
0.4 Hrs.
*This is a unique Labor Operation for Bulletin use only.
Version
4
Modified
11/24/2025 Created on

01/19/2026 Update to the models and correction sections.

01/29/2026 Update to the correction sections.

02/03/2026 Update to the Condition, Cause, Correction and model sections.
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

SaleBestseller No. 1

OTOFIX D1 Lite 2026 Bidirectional Scan Tool, Bluetooth OBD2 Scanner Diagnostic Tool, 2 Years Free Update, 38+ Services, CANFD & DoIP Protocols, All System Diagnoses, ABS Bleeding, Auto VIN

🎉[OTOFIX D1 Lite, Perfect Cost-effective Diagnostic Tool]: OTOFIX D1 Lite, a newest bidirectional scan tool from OTOFIX company, is a great choice for DIYers and repair shops. 👉This obd2 scanner diagnostic tool packs all practical functions: OE level all systems diagnoses, Bi-Directional Control, 38+ reset services fixing 99% of common problems, support DoIP & CANDF protocols and FCA AutoAuth, high-end hardware configuration. Worldwide vehicles and 🔥2 Years Free Updating🔥 covered.
🎉[Bi-Directional Scan Tool, Active Test]: OTOFIX D1 Lite bluetooth obd2 scanner can also command ECUs and monitor the operation of the actuators to track down the problems of certain parts, like windows, sunroof, wipers, fuel pumps, etc., saving repair time & trouble. This makes OTOFIX D1 Lite the most cost-effective bidirectional scan tool.
🎉[2026 Newest, 38+ Hot Reset Functions]: Equipped with 38+ reset functions in one, the OTOFIX D1 lite automotive scanner diagnostic tool allows you to troubleshoot 99% of common vehicle problems. You can use this car diagnostic scanner holding enough functions to easily repair common vehicle models in your repair shops. Including Oil Reset, Injector Coding, Throttle, DPF Reset, SCR Reset, Gear Learning, Clutch Learning, Suspension, etc. Note* Reset functions vary by model.
🎉[OE Level Full Systems Diagnostics]: Unlike the 2-system and 4-system diagnostic tools, the OTOFIX auto scan tool can complete comprehensive system diagnostics within 5 minutes. It accesses and scans all available onboard systems like for Engine /AT /ABS /EPB /BMS /TPMS /SRS /SAS /Audio System /BCM /Air Conditioning / etc., to read & clear codes, view live data, and check ECU information. Note: Active test is not involved.
🎉[Powerful Hardware Configuration]: Designed with a fashion appearance & a 7” touchscreen and a weight of 463g, this OTOFIX D1 Lite OBD2 diagnostic scanner scan tool is convenient for everywhere and easy to use & store. Android9.0 OS and 2+64GB memory enhance multi-task smoothness and diagnostic operation, no more wasting too much time. 5800mAh battery allows hours-lasting use. WiFi & VCI1 also bring faster communication for your diagnostics.

SaleBestseller No. 2

OTOFIX D1 Lite Bidirectional Scan Tool with 2-Year Free Updates, 2026 New All System Automotive Diagnostic Scanner, 38+ Reset Services, FCA AutoAuth, Active Test, CANFD&DOIP, Auto VIN

🏆【2026 TOP OBD2 Scanner Diagnostic Tool】OTOFIX D1 Lite wireless obd2 scanner has upgraded hardware configuration and car coverage. The newly upgraded D1 Lite with 🔥OS Android 9.0🔥1.5Ghz 4 core high efficiency processor🔥2GB RAM+64GB ROM large storage🔥5800mAh large battery, more stable and longer lasting diagnostics🔥 38+ Reset🔥action tests🔥full system diagnostic🔥Supports MV105 endoscope🔥21+ Language Supports🔥100000+ vehicle coverage to meet all your daily maintenance needs.
👍【Bi-Directional Control / Active Test】D1 Lite obd2 scanner has bidirectional control(worth $300+), which is the most beloved feature among mechanic. If your headlights or car windows are broken, going to a repair shop will cost a lot of money. You can use D1 Lite to send execution commands to the ECU module and identify the repair status. Such as ABS, car windows, doors, valves, wipers, headlights, etc., effectively shorten diagnostic time and reduce diagnostic costs.
🔥【All Systems Diagnostics, In-depth Checking】This advanced OBD2 Scanner D1 Lite can perform OE-level diagnosis of all systems including engine, transmission, airbag, ABS, ESP, TPMS, gateway, steering, radio, and air conditioning for more than 100 brands. This diagnostic scanner supports essential functions, such as reading ECU version info, reading and clearing fault codes, and reading data streams.With just a simple click, it provides you with accurate and in-depth diagnostics.
🏆【38+ Reset Hot Functions】For repair workshops, holding an OTOFIX D1 Lite Auto scanner is a strong advantage over others. Its 38+ maintenance functions provide various solutions for all module repairs, including Oil Reset, TPMS Reset, Injector Coding, Suspension, Throttle Matching, etc., which will usher your repair business to a new pinnacle. Continuously updating will never make the functionality & compatibility out-of-date.
🏆【150+ Models, 10000+ Car Coverage & 16 Languages】D1 Lite is a comprehensive car diagnostic scan tool, help you to troubleshoot car issues fast for 95% US, European, Asian auto makes. ✅ With frequent updates and optimizations allow D1 Lite to cover more vehicles to meet your needs. ✅ Multilingual menu allows auto mechanics around the world to use it without language barriers. 🚩Note: Kindly send us the S/N of the device to authorize new language updates before changing the menu language.

SaleBestseller No. 3

OTOFIX D1 Lite 2026 Bidirectional Scan Tool, 2 Years Free Update, 38+ Services, All System Diagnostic Scanner, Active Tests, AutoAuth FCA SGW, AutoVIN, CAN FD & DoIP, 99% Car Coverage

【2026 OTOFIX D1 Lite Gives the Best Value for Money】OTOFIX D1 Lite bidirectional scan tool is more FASTER and SMARTER with 2026 Enhanced Hardwares & New Functions! 👍Alternative Bluetooth +USB connect 👍2G+64GB 👍4x ARM Cortex-A35 (1.5GHz) Processor (5X Faster CPU) 👍Android 9.0 OS 👍5G GHz WiFi 👍CANFD&DOIP 👍 FCA AutoAuth 👍38+ Services 👍3K+ Bi-Directional Control 👍Full Systems Diagnose 👍2 Years Update 👍150+ Vehicle Coverage.
👍【Active Tests】 OTOFIX D1 Lite is a bi-directional scan tool that can send commands to, and also receive information from vehicle control modules. This way, you can quickly locate and repair faulty auto parts. For Example: send direct commands to ask the vehicle to turn on/off the radiator fan, lights, sound horn, fuel pump, modulate throttle, open/close windows, operate mirrors and more. *Note that only available tests will be displayed in the menu.
👍【38+ Service Functions】 OTOFIX D1 Lite scan tool offers 38+ of the hottest service functions that are commonly used for car repairs. That include Oil reset/SAS/EPB/BMS/Throttle/ABS bleeding, and 2065-new SUS/ADBLUE/NOX/Headlamp resets (and more) to help restore your car status after repairs are done. Compared to other diagnostic scanners for cars, the OTOFIX D1 Lite scanner is much more fully-featured. *Note that specific functions available depend on the make/model/year of your car.
👍【All System Diagnostics + Cloud Report Management】 This 2026 car scanner OTOFIX D1 Lite provides troubleshooting and data for all ECUs: read/clear DTCs, view graphic live data/VIN, and locate system faults for safe driving. With Cloud Report Management, you can save detailed reports to cloud servers and easily shared them with others via QR codes/emails/text messages. Others can access these reports from any device (smartphones/tablets/PCs …) anytime, and you can better manage repair work.
👍【99% Car Coverage】 This one-station car scanner diagnostic for all cars works on 150+ major car brands across the world. 1) It supports CAN-FD/DoIP protocols: compatible with GMCAVALIER/TRAX/Encore/Envision/GL8(LSY)/CT4/CT5 after 2019; Volvo after 2018; Land Rover/Jaguar after 2017; and BM.W F/G all chassis. 2) For models equipped with security modules (such as Renault & 2018+ FCA SGW), its built-in AutoAuth allows you to easily break diagnostic barriers after registration.

This product presentation was made with AAWP plugin.

Last update on 2026-05-12 / Affiliate links / Images from Amazon Product Advertising API

Buffer Email Facebook Flipboard Hacker News LinkedIn Messenger Mix Pinterest Print Reddit SMS Telegram Tumblr X VK WhatsApp Line Xing Threads Bluesky Copy Mastodon Nextdoor