• Eaton Fuller Transmission Control Module Repair Service
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Eaton Fuller Transmission Control Module Repair Service

Eaton Fuller Transmission Control Module Repair Service

$999.00 USD
$999.00 USD
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Eaton Fuller K4199RX TCU Repair & Programming Service

Expert Mail-In Repair Service for AutoShift & UltraShift Transmission Control Units
Save $2,000+ Compared to Dealership Replacement

3-5 Day Turnaround Programming Included 6-Month Warranty
Is Your Transmission Stuck in Gear? Flashing "F" on Display?

DON'T replace your TCU until you read this! We've repaired over 1,000 Eaton Fuller units and discovered that 40-50% of trucks sent to dealerships for $3,000+ TCU replacements actually just need electrical repairs costing a fraction of that price.

Our Mail-In Repair Service vs. Dealership Replacement

Our Repair Service
$999
VS
Dealership Replacement
$3,500-$6,500
Complete Repair Package Includes:
  • Complete Diagnostic Testing - We test EVERY circuit, sensor input, and component
  • Full Electrical Repair - Solder-level board repairs, connector restoration, power supply fixes
  • Factory Software Preserved
  • Testing Under Load - We simulate real-world operating conditions
  • 6-Month Unlimited Mileage Warranty - We stand behind our work
  • 3-5 Day Turnaround - Fast service to get you back on the road

We Repair All K4199RX Part Numbers

K4199RX K-4199RX K4199 K-4199 K3639RX K-3639RX K-3639 K-3639R HP5Z5451916BB ZBFK3639RX FULK4199RX 700482AT

Compatible Vehicles (2005-2016+ Gen 2 AutoShift & UltraShift)

Freightliner

Cascadia (All Models)
Columbia
Coronado

Peterbilt

579
389
387
386
567

Kenworth

T680
T880
W900
T2000

International

ProStar
LoneStar
9400i

Volvo

VNL Series (All Models)

Mack

Pinnacle
Granite
Vision

Ford

F-650
F-750
LCF

Common Problems We Fix

Symptoms:

  • Flashing "F" on gear display (fault mode)
  • Stuck in single gear (won't shift up or down)
  • No neutral confirmation (won't allow engine start)
  • Intermittent shifting failures
  • Transmission "power cycles" randomly
  • Gear skipping (jumps from 12th to 14th)
  • Dashes (--) instead of gear position
  • Service light constantly on
  • Erratic speedometer readings

Fault Codes We Specialize In:

Code 11 (FMI 12) TECU Internal Failure - True TCU failure
Code 13 Shift Control Communication Loss
Code 36 Engine ECU Communication Fault
Code 56 Input Shaft Speed Sensor Issues
Code 63 XY Shifter Position Sensor Fault
Code 72/73 Failed to Select Rail/Engage Gear
Code 65 Output Speed Sensor Problems

Why Choose ECU Maverick?

  • Honest Diagnostics - We Don't Upsell: Unlike dealerships that profit from selling new units, we make money by FIXING your existing TCU. If it's beyond repair, we'll tell you upfront before you waste money.
  • Expert-Level Repairs: Our technicians are ASE Certified with specialized training in Eaton Fuller automated transmissions. We repair at the component level - not just plug testing like most shops.
  • Real Testing Equipment: We own Eaton ServiceRanger 4.0 Professional diagnostic software and custom test benches that simulate actual transmission operation. Your TCU is tested under load conditions, not just on a shelf.

 Before You Ship: Try This FREE Fix First!

40% of TCU problems are actually electrical issues! Try this before shipping:

  • Clean battery terminals thoroughly with wire brush
  • Check all ground connections at transmission case
  • Inspect transmission harness for damage/corrosion
  • Load test your batteries (should be 12.5V+ engine off)
  • Check voltage at TCU connector (should be 12V+ running)

Still having problems? Then it's time for our expert repair service.

Our Warranty - Best in the Industry

6-Month Unlimited Mileage Warranty

  • Full parts and labor coverage
  • No mileage restrictions (haul cross-country with confidence)
  • Advanced replacement program (we ship first if warranty issue)
  • Transferable if you sell the truck

Lifetime Technical Support

  • Free phone support for installation questions
  • Troubleshooting help if you have issues
  • Software update assistance
  • Direct access to technicians

What Our Customers Say

"Dealership wanted $4,200 for new TCU. ECU Maverick fixed mine for $595 and it's been running 6 months strong. Saved me $3,600!"
- Mike R., Freightliner Cascadia Owner-Operator
"They found a damaged connector that three other shops missed. Fixed it, updated software, had it back in 5 days. Best money I ever spent."
- Dave T., Fleet Manager, 47-Truck Fleet
"Code 11 failure on a 2012 ProStar. ECU Maverick repaired the board instead of replacing. Truck has been perfect for 80,000 miles since."
- Ramon S., Long-Haul Driver❓ Frequently Asked Questions

What if my TCU is beyond repair?

We'll refund your deposit minus $50 diagnostic fee. We'll also offer you a quality remanufactured replacement at our cost ($1,295) - still cheaper than dealership!

Do I need to send my XY Shifter too?

No, unless you have specific XY shifter codes (72/73). We test TCU independently.

How do I remove the TCU?

We provide detailed removal instructions with photos. Most take 15-30 minutes. Location varies by truck model.

Will this void my truck warranty?

No. Magnuson-Moss Warranty Act protects your right to use independent repair services. We provide documentation for warranty purposes.

Do you reprogram for different transmission models?

Yes! We can reprogram your TCU for different transmission configurations. Call for details and pricing.

Related Search Terms

Eaton Fuller K4199RX repair | K3639RX TCU repair | AutoShift TCU repair | UltraShift transmission control unit | Freightliner Cascadia TCU repair | Peterbilt transmission control unit | Kenworth TCU repair | transmission stuck in gear | flashing F transmission | Code 11 FMI 12 repair | transmission control module repair | automated transmission repair | TCU programming service | Eaton Fuller repair service | mail-in TCU repair | transmission ECU repair | automated manual transmission repair | truck transmission control unit | commercial truck TCU repair | transmission computer repair

Eaton Fuller, AutoShift, and UltraShift are registered trademarks of Eaton Corporation. ECU Maverick is an independent service provider and is not affiliated with or endorsed by Eaton Corporation.

 

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Getting Started

Start a request

Open a request in MavConnect, our customer portal, and tell us the vehicle, the module and what it's doing. A technician reviews it and sends your Technical Review — the price and the shipping instructions — in writing. Accept it, ship the module with any carrier (USPS, FedEx or UPS), and write your request number on the box.

WHAT'S COVERED

A technician looks first

Every request starts with a $195 Technical Review: a technician checks your part number, codes and photos against this service and confirms it's the right call before you ship anything. Go ahead with it and the $195 comes off your price. Want the module measured on the bench before we work on it? Add bench evaluation when you submit — $195 per hour, and you'll know the hours before we start.

WHAT TO EXPECT

Turnaround & warranty

✓ Turnaround: stated in your Technical Review and counted from the day your module reaches our bench.  

✓ Warranty: six months on rebuilds and programmed replacements, when installed by a licensed shop.

✓ Programming: your module comes back with its own programming — plug in and drive. Programmed to your VIN — plug in and drive"

About ECU Maverick — ECU Repair, Rebuilding & Programming Specialists

ECU Maverick rebuilds, programs and clones control modules for European, domestic and specialty vehicles. Based in Fort Myers, Florida, we work with independent shops, dealerships and vehicle owners nationwide — by mail.

Where most shops replace and reprogram, we work at the board level: our technicians rebuild the circuits that fail, bringing back modules others write off. That comes from years of reverse engineering and bench work across thousands of control units.

Vehicles We Service

We specialize in European automotive electronics — BMW, Mercedes-Benz, Audi, Porsche, Land Rover, Bentley, Ferrari, Lamborghini, Maserati and Aston Martin — and also service domestic vehicles, heavy-equipment control modules and marine electronics.

Why Shops and Owners Choose Us

Price in writing first — Your Technical Review gives you the exact price before you ship. No surprises, and the $195 comes off your price when you go ahead.

Plug-and-play ready — Rebuilt modules keep their programming; replacements are programmed to your VIN. No dealer visit.

A technician, in writing — Every answer comes from the technician who has your file, on your request in MavConnect. You can read it twice, share it with your shop, and come back to it a year later.

Six-month warranty — On rebuilds and programmed replacements, when installed by a licensed shop. Full terms on your request.

Our Commitment

We exist to keep your vehicle out of the dealership and back on the road — a technician's honest answer, a price in writing, and the same care we'd give our own car, from the first message to the day the module is back in your hands.

Get in touch

Ready when you are.

One place for everything — your request, your technician's answers, your prices and your tracking. No forms that go nowhere, no waiting on hold.

Reach a technician

Open a request in MavConnect

Tell us the vehicle, the module and what it's doing. A technician reviews it personally and answers on your request, where you can read it, ask follow-ups, accept, and watch every step after.

Open MavConnect →

Already a customer? Sign in and message us from your request — your technician sees the whole history, so nothing gets lost or repeated.

By mail only

A workshop, not a storefront

No walk-ins, no drop-offs, no counter. Modules arrive by UPS, FedEx or USPS, go straight to the bench, and ship back to your door.

Before you ship

Open a request first. Your Technical Review tells you exactly what to send and where, so your module reaches the right bench the day it arrives.

Independent service — important notice

ECU Maverick is an independent module rebuilding and programming shop. We are not affiliated with, endorsed by, or sponsored by BMW, MINI, Mercedes-Benz, Audi, Volkswagen, Porsche, or any other vehicle manufacturer, nor with component manufacturers such as Bosch, Continental, Siemens, Denso, Delphi, or ZF. All trademarks belong to their respective owners and are used for identification purposes only. Refurbished products are refurbished by us or by independent third parties, not by the original manufacturers.