Allison Transmission TCM 29551869
Allison Transmission TCM 29551869 - Image 2
Allison TCM 29551869

Allison Transmission TCM 29551869

Code: 29551869

Allison Transmission 1000-4000 series TCM 29551869

Reaction Force LLC provides FREE BENCH TESTING and over-the-phone diagnostics. Questions about your TCM? Call us at (503) 862-6322.

Condition: New

Recalibration: Included

Compatible years: 2006-2016

Supersedes: 29545536, 29545322, 29545537, 29545323, 29545538, 29545324

Warranty: 6 months

$1,850.00

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Description

Allison TCM 29551869 4th Gen A59 Transmission Control Module

Compatible years: approx. 2006–2016

The Allison 29551869 is the 4th Generation A59 transmission control module (TCM) for 1000, 2000, 3000, and 4000 Series automatic transmissions. Introduced in 2014, this A59 version was released as an updated and more reliable replacement for earlier 4th Gen TCMs that suffered from heat-related failures and board separation issues.

Common symptoms of a failing 4th Gen TCM (prior to A59)

  • Stuck in limp mode or failure to shift

  • Hard or delayed shifting between gears

  • Codes like U0101 or P0700

  • Scan tool can’t communicate with TCM

  • No response from transmission at startup

  • Loss of 4th or 5th gear in automatic mode

If you’re replacing a failed 4th Gen unit, the A59 version (29551869) is a reliable, plug-in replacement with improved thermal stability and design.

Pre-replacement checklist

Before installing your new 29551869 TCM, check:

  1. Battery voltage and ground: Low voltage or voltage spikes can damage the TCM

  2. Wiring harness: Look for corrosion, melted pins, or frayed sections

  3. Moisture or contamination: Water damage was a common issue with pre-A59 modules

  4. Verify TCM part number and connector style

  5. Scan for P-codes: Focus on TCM-related faults

Unsure? Reaction Force offers free bench testing and phone-based diagnostics to confirm the issue.

Related diagnostic trouble codes

These fault codes are often linked to Gen 4 TCM failure:

  • P0700 – Transmission control system fault

  • U0101 – Lost communication with TCM

  • P0880 – TCM power input circuit failure

  • P0606 – Internal control module processor fault

  • P2534 – Ignition run/start circuit low

  • P2544 – Torque management request input signal

You may also see manufacturer-specific codes related to gear range faults or speed sensor data errors.

Installation notes

  • Disconnect the battery before beginning installation

  • Mount TCM in a clean, dry location with proper hardware

  • Reconnect all harnesses securely—check for corrosion

  • Program the TCM after to match the vehicle

  • Clear all stored fault codes and perform a test drive cycle

Frequently asked questions

1. What is the A59 version of the 4th Gen TCM?
The A59 is a revised version of the 4th Gen Allison TCM with updated internals and improved heat resistance.

2. Can I use the A59 to replace my old 4th Gen TCM?
Yes. It’s a drop-in replacement and is considered a more durable alternative.

3. Do I need to program this TCM?
Yes. It must be programmed to match your transmission and vehicle configuration.

4. What vehicles use this module?
A wide range of GM, Isuzu, International, and vocational trucks using Allison 1000–4000 Series transmissions between 2006 and 2016.

5. Will this fix shifting or limp mode issues?
If the issue is due to internal TCM failure or communication loss, yes. But proper diagnosis is always recommended.

Need help?

Reaction Force offers:

  • Free over-the-phone troubleshooting

  • Free bench testing of suspect TCMs

  • A59 upgrade guidance (vs. older 4th Gen parts)

  • Programming and install support for shops or DIYers

Call (503) 862-6322

Name

Images are for representation purposes only. For reman and RTO purchases a photo of the actual item you are receiving will be sent for approval prior to shipping.

Please see our warranty, shipping, refund, and return policies.

Additional information

Weight 3 lbs
Dimensions 9 × 9 × 4 in
Applications for 29551869

This 4th Gen A59 TCM is compatible with the following Allison transmission families: 1000 Series (light-duty, commercial trucks) 2000 Series (medium-duty, box trucks, utility vehicles) 3000 Series (refuse, shuttle, emergency) 4000 Series (heavy-duty vocational and transit)
Common vehicles

Chevy/GMC 2500HD/3500HD (Duramax with Allison) Freightliner and International chassis Isuzu FTR/N-Series and NPR HD Thomas Built buses and Blue Bird buses Refuse trucks, tow trucks, construction equipment
Product specifications

Part number: 29551869 Generation: 4th Gen A59 Compatibility: 1000–4000 Series (2006–2016) Condition: Remanufactured and bench-tested Programming required: Yes – must be VIN/programmed for application Warranty: 6-month limited warranty

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