Name: Allison Transmission 1000-2000 series TCM 29542725
SKU: 29542725-R
Price: 899.00 USD
Availability: InStock

Description

Allison Transmission 1000-2000 series Transmission Control Module R29542725

Common symptoms of a failing TCM

Vehicle stuck in limp mode or fails to shift
Harsh or delayed shifting
No gear display or random gear changes
P0700 or U0101 diagnostic codes
Scan tool cannot communicate with the TCM
Inconsistent torque converter lockup

These symptoms typically appear after internal electrical failure, corrosion, or voltage instability.

Pre-replacement checklist

Before replacing your 29542725 TCM, confirm the following:

Battery voltage – Must be stable (no surges or low voltage)
Inspect wiring harness – Look for corrosion, damage, or loose pins
Check for moisture intrusion – Especially inside the TCM housing
Verify ground integrity – Clean and tight connections
Scan for communication faults or voltage errors

Not sure? Reaction Force offers free diagnostics and bench testing to help you confirm the failure.

Related diagnostic trouble codes

These Gen 3 (pre-CAN) TCMs often trigger the following fault codes when failing:

P0700 – Transmission control system malfunction
U0101 – Lost communication with TCM
P0880 – TCM power input signal fault
P0722 – Output speed sensor – no signal
P0601–P0606 – Internal TCM processor or memory faults

Installation notes

Disconnect battery before installation
Mount unit securely, verify all connections
Programming is required for proper function
Ensure clean grounds and proper voltage during install
Professional install recommended if you don’t have a scan/programming tool

Need expert help?

Reaction Force offers:

Free phone diagnostics
Free bench testing
Programming and install support
Vehicle compatibility guidance

Call (503) 862-6322

Frequently asked questions

1. What does the 29542725 TCM do?

It manages shift timing, torque converter behavior, and communication between the transmission and engine in Gen 3 1000/2000 Series Allison systems.

2. What vehicles use this part?

1999–2006 GM commercial platforms, Workhorse step vans, Isuzu NPR/NQR models, and other medium-duty vehicles using Gen 3 TCMs.

3. Does this part need programming?

Yes, it must be programmed after install using dealer-grade or compatible diagnostic tools.

4. Can I install this myself?

Yes, but only if you have the proper scan tool and know how to calibrate the unit. Otherwise, professional install is recommended.

5. Is this compatible with Gen 4 or later?

No. This is a pre-CAN Gen 3 TCM and will not work with 2007+ platforms or CAN-based ECUs.

Send us a message and we will go to work for you.

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	12 × 10 × 4 in
Applications for 29542725	GM HD chassis (pre-2007) Workhorse P-series step vans Isuzu NPR/NQR trucks (gas and diesel) Commercial vans and box trucks Ambulances and shuttle buses Utility, municipal, and service vehicles
Product specifications	Part number: 29542725 Transmission: 1000/2000 Series (Gen 3) Compatibility: 1999–2006 (pre-Gen 4) Condition: Remanufactured and bench-tested Programming: Required for vehicle match Warranty: 6-month limited warranty

Reviews

There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.