TAIB0994 Service Bulletin/Repair Instructions

Service Bulletin – Product
Subject: Endurant HD AT and PACCAR AT Mechatronic Transmission Module (MTM)

Loose Rail Cover Cap Screws

Document Number: TAIB-0994

Updated: April 4, 2022
Date: July 19, 2021
Issue Description:

MTM rail cover cap screws may come loose, leak air, and result in a Rail B or Rail C

fault.

•

•
FC 740 SPN 6145 FMI 0 (Rail B)

FC 760 SPN 6146 FMI 0 (Rail C)
Containment/Corrective Action:

The following manufacturing changes have been applied:

1. July 29, 2019 - 100% visual inspection to verify Loctite was applied to cap

screws and rail covers were fully seated.

2. August 23, 2019 - rail cover cap screw torque was increased to 12.5 Nm.

3. September 4, 2019 - implemented refined machining process and sorting at

manufacturing plants.

4. Julian Date Build Date Code etched into MTM Housing:
Vender MTM Serial Number Decoder from example above

• 12S18341102918 = 2018

• 12S18341102918 = 341st day of 2018 (December 7, 2018)

Affected Models/Population: Endurant HD AT and PACCAR AT MTM’s and

transmissions built prior to above Containment / Corrective Actions.
Page 1 of 6
Service Bulletin – Product

Field Strategy:

1. Upon removal of the MTM for inspection from an Active or Inactive Rail B or

Rail C Fault noted in the issue description above, and sealing O-ring is

protruding, the MTM must be replaced. For any Active or Inactive Rail B or Rail

C Fault follow the troubleshooting guide TRTS0950.

2. For MTM serial number less than 12S19248145012,

o If the MTM is removed for another failure and any loose rail cap screws

are found (no Active or Inactive rail MTM faults) or the sealing O-ring is

not protruding, reference the RRMT0037 Service Procedure. If there are

Active or Inactive codes for any MTM faults and there are no loose rail

capscrews, follow the troubleshooting guide TRTS0950.

Note: RRMT0037 Service Procedure is available in the July 2021

Edition of the Endurant Service Manual (TRSM0950).

o If torque specifications outlined in the service procedure cannot be met

(threads in MTM are stripped) the MTM must be replaced.
3. Pictures of loose cap screws, position, and MTM serial number shall be

documented in the warranty claim.

MTM Rail B and Rail C Identification
Page 2 of 6
Service Bulletin – Product

MTM Rail Cover Locations
Rail B Rail Cover Loose Cap Screw Identification
Page 3 of 6
Service Bulletin – Product

Rail C Rail Cover Loose Cap Screw Identification
•

•

•
Perform service procedure ONLY if a rail cap screw is visibly loose.

Pictures, loose screw position, and MTM serial number must be documented in

the warranty claim.

If no loose rail cap screws are visibly verified, no further service is needed.
Page 4 of 6
Service Bulletin – Product
Rail D

Rail E

Rail C

Rail B
There is one cap screw on Rail C that is not accessible. Do not dissassemble any

other components to access this cap screw. If this cap screw is visibly loose replace

the MTM.
Page 5 of 6
Service Bulletin – Product

Warranty Information:

Warranty Parts:

• Loctite 262 / Red Eaton part number 71232 (10 ML Tube) or Loctite 243

/ Blue or equivalent - source locally

• ¼” Brass Brush - source locally

• Foam Swab - source locally

Warranty Labor:

• Inspection (0.2 hours)

• Claim Documentation (pictures, cap screw location, and MTM S/N) (0.3

hours)

• Repair Procedure (1.0 hours)

Claim Coding:

• If Rail C Fastener loose is primary, reference Endurant Claim Coding

guidelines for Rail C Fastener loose (whether Rail B and/or C).

•
If the MTM is removed for another failure, no additional claim coding is

required. Code to original reason that the transmission was repaired.
•
If MTM loose fastener repair is completed for a clutch claim and there is no

other transmission failure mode, then reference Endurant Claim Coding

guidelines for Rail C Fastener loose (whether Rail B and/or C).
The material contained in this bulletin is product improvement information. Eaton Corporation is not committed to,

or liable for, canvassing existing products.

FSUD: 2021-FSUD-4277
Page 6 of 6

SaleBestseller No. 1

TOPDON Bidirectional Scan Tool, 2026 New ArtiDiag900 Lite Automotive Diagnostic Tool for Full System, Scanner for Car with Active Test, 8 Reset, Wireless OBD2 Scanner Diagnostic Tool for All Vehicles

[2026 Top-Tier Hardware and Software Upgrade]: Topdon ArtiDiag900 Lite scanner has enhanced hardware and latest features, including Android 11.0, 5x faster CPU, 10000mAh battery for 12 hours of continuous operation, stable wireless diagnosis with Bluetooth 5.0, 8-inch touchscreen. Added bi-directional control, wireless diagnosis, battery testing (optional), and DTC repair guide
[TOPDON Bidirectional Scan Tool]: This bidirectional obd2 scanner sends commands to the vehicle's ECU for active testing, enabling users to accurately and quickly locate faulty components such as injectors, coolant pumps, windows, wipers, headlights, mirrors, etc. The bidirectional control scanner is the ideal choice for workshops/automotive repair shops as it significantly reduces mechanic's diagnostic time.
[Wireless Bluetooth Diagnostic Experience]: The AD900 Lite scan tool comes with a Bluetooth 5.0 VCI, supporting a wireless diagnostic range of up to 33 feet (10 meters), allowing you to diagnose without being confined to cables or tight spaces. Stable and fast wireless diagnosis provides a comfortable repair environment. It also offers VCI cables to increase connectivity options.
[DTC Repair Guide Function]: Easily diagnose issues with your vehicle and receive guidance on repairs with the topdon scan tool's fault code definitions for all systems,maximize your diagnostic capabilities. This function is compatible with Chrysler/Dodge/Jeep/Fiat 2010-2014 and expanding with continual updates,the AritDiag 900 Lite car diagnostic scanner is the must-have tool for any technician or DIY enthusiast.
[OE-Level Full System Diagnostics]:AritDiag900 Lite full system diagnostic scanner can scan ALL available modules(Engine, Transmission, Airbag, ABS, ESP, TPMS, Gateway, Steering, Radio, Air conditioning, ect.) to✔read ECU info, ✔read/clear codes, ✔view live data stream, ✔retrieves freeze-frame, ✔perform active tests, and more. With just a simple click, it provides you with accurate and in-depth diagnostics.

SaleBestseller No. 2

TOPDON ONE Bidirectional Scan Tool, 10.1" OBD2 Scanner with J2534 Pass-Thru and ECU Coding, Over 50 Resets, Topology Mapping Car Diagnostic Tool for All Vehicles

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
Topfix AI Assistant: Covers 5 million plus fault codes and delivers instant causes, symptoms, and repair guidance with professional wiring diagrams for each code.Slashes diagnostic time, boosts first-time fix accuracy, and increases shop revenue
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.

SaleBestseller No. 3

TOPDON TopScan Lite OBD2 Scanner Bluetooth, Bi-Directional Scanner Wireless All System Diagnostic Tool for iOS & Android, 8+ Hot Reset, Repair Guides, Check Engine Car Code Reader, Performance Test

Bi-Directional Control, Quickly Locate Problems: Turn your phone into a professional diagnostic tool. You can send commands from your phone to the ECU to test injectors, cooling fans, headlights, A/C clutch, windows, wipers, and more. See which one doesn't respond. Helps you quickly locate the problem and save time. No need to tear things apart, avoid blind disassembly.
Full System Diagnostics, No Fault Hides: Unlike basic diagnostic tools that only cover 4 systems, TopScan can scan all systems. Read and clear trouble codes, view live data streams, and generate a complete vehicle health report – all issues are clear at a glance. Covers 10,000+ vehicle models and is compatible with 99.99% of vehicles.
Flexible Subscription, Choose Advanced Features as Needed: TopScan Lite provides free-for-life access to core diagnostics, including full system scan, code reading, performance tests, and repair information. After purchase, advanced features (bi-directional control, service operations, live data, code clearing, and AI functions) are free-for-the-first-year. After the first year, if you want to use advanced features, you need to subscribe on a monthly, quarterly, or yearly basis. As new models and reset functions are updated, the tool will also be continuously upgraded.
AI Assistant - TopFix: Think of TopFix as your personal AI mechanic. It leverages a repair database and OEM data to deliver clear, step-by-step repair solutions. Features include AI Q&A, one-click translation, and a full repair log, making your diagnostic process simpler and more efficient.
8+ Hot Resets, Keep Your Car in Top Shape: One-tap resets for oil, throttle, EPB, steering angle, DPF, ABS, BMS, and airbag. It enables car owners to easily perform essential maintenance, ensuring the vehicle stays in optimal condition and extends its service life.

This product presentation was made with AAWP plugin.

Last update on 2026-05-13 / 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