Fuller TCM Repair Service | UltraShift & AutoShift

Restore smooth, reliable shifting performance to your commercial fleet with our professional Eaton Fuller Transmission Control Module (TCM) Repair Service. Engineered specifically for heavy-duty Eaton automated transmissions, this service delivers factory-level module rebuilds and diagnostic testing without the high price tag of purchasing a brand-new replacement controller from a dealership.

Our specialized technicians thoroughly diagnose, repair, and bench-test your transmission computer to correct critical circuit flaws, component degradation, and shifting faults. Rather than risking your budget on an unprogrammed salvage yard unit or an expensive new module, our repair service provides a highly cost-effective alternative while safely retaining your original vehicle parameters, clutch calibrations, and fleet configurations.

With our expedited 24 to 48-hour turnaround time, we prioritize getting your truck back on the road to minimize expensive operational downtime. Best of all, because your original physical module is completely rebuilt and updated, it will be returned to you ready to install with zero additional programming or calibration required.

Compatible Transmission Series & Models

This repair service supports a wide range of Eaton automated transmissions, including the UltraShift, UltraShift PLUS, and AutoShift series across medium and heavy-duty applications:

• FO / FAO / FOM / FAOM Series: (UltraShift & AutoShift 10, 13, and 18-Speed Transmissions)

• EA / EH / EO Series: (UltraShift PLUS Performance, Linehaul, and Vocational Platforms)

• FA / FM / ET Series: (Medium-Duty UltraShift 6-Speed Platforms)

Compatible Part Numbers & Kit Interchanges

We support the following interchangeable OEM part numbers, hardware revisions, and service kits for this platform:

• TCM Assembly Numbers: ETC2004A02, ETC2004A04, ETC2004A05, ETC2004A06, ETC2008A06, 2C77281600, 2C74850501, 4308682

• Eaton Service Kit Interchanges: K-4323 (K4323), K-3797 (K3797), K-3766 (K3766)

Premium Service Features

• ⚙️ Advanced Diagnostics: Component-level testing and precision rebuilding of damaged trace circuitry, power stages, and communication chips.

• ⚡ Ultra-Fast Processing: Quick 24 to 48-hour turnaround time to keep your vehicle moving and eliminate extended shop stays.

• 🔄 True Plug & Play: Retains your transmission's existing clutch software profiles, gear calibrations, and VIN settings—no expensive reprogramming needed.

• ✅ Environmental Bench Testing: Rebuilt modules are rigorously stress-tested under simulated shifting loads and thermal conditions to guarantee durability.

• 💰 Fleet Savings: A smart, sustainable, and reliable alternative to steep dealership replacement costs.

Common Eaton Fuller TCM Failure Symptoms

Automated transmission controllers are mounted directly in harsh environments where they face continuous gear vibrations, road debris, moisture intrusion, and severe temperature swings. A failing TCM frequently causes these common drivability issues:

• Intermittent or permanent "F" or "Check Trans" error codes flashing on the dashboard display

• Transmission suddenly drops into neutral while driving or refuses to engage a forward/reverse gear

• Total loss of communication between the TCM and engine ECM or diagnostic tools via the J1939 data link

• Inability to complete initialization or execute proper clutch calibration procedures

• Persistent transmission active codes regarding XY Shifter actuators, rail select motors, or speed sensors (when the sensors themselves are functioning perfectly)

• Intermittent stalling when coming to a stop or erratic, unpredictable shifting patterns under load

How Our Repair Process Works

1. Place Your Order: Purchase our Eaton Fuller TCM repair service through our secure online checkout.

2. Ship Your Module: Pack your TCM securely with a copy of your order confirmation sheet and ship it to our specialized repair facility.

3. Diagnostic & Repair: Our technicians run full diagnostic cycles, isolate internal micro-component failures, and rebuild the module circuits.

4. Load Verification: The rebuilt controller undergoes rigorous physical simulation testing to ensure flawless communication and shifting execution.

5. Plug & Play Return: We ship your rebuilt TCM straight back to your shop, ready for immediate bolt-on installation and operation.