2007-2009 Yukon Transmission Control Module 24238856 | VIN Programmed T42

End Your Yukon’s Shifting Problems

Tired of harsh shifts, limp mode, or transmission warning lights on your GMC Yukon? This T42 Transmission Control Module is your plug-and-play solution. It arrives pre-programmed to your vehicle’s VIN, so you can skip the expensive dealership visit. Restore smooth, reliable performance with an easy 30-minute installation. Order today and get your truck driving right again!

$79.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 591-07270-359 Categories: ,
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Fix Your GMC Yukon’s Shifting Problems with a Programmed T42 TCM

If your 2007-2009 GMC Yukon is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). The T42 module, specifically, is the brain behind your 4L60E, 4L65E, or 4L70E automatic transmission, and when it fails, it can make your reliable SUV feel unpredictable and unsafe. This isn’t just an inconvenience; it’s a critical failure that impacts fuel economy, performance, and your peace of mind.

This replacement T42 TCM, compatible with part number 24238856, is the definitive solution. We take the guesswork and high cost out of the repair by pre-programming the module to your vehicle’s exact VIN before it ships. This means no expensive trip to the dealership for programming—it’s a true plug-and-play fix that you can often do yourself in your own driveway.

A Technician’s Notebook: The Intermittent Shifting Nightmare

A customer brought in his ’08 Yukon XL, complaining of intermittent, violent 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The check engine light was on, but the codes were sporadic—mostly a generic P0700 (Transmission Control System Malfunction). After checking the fluid and wiring harness, everything looked fine. This is a classic symptom set I’ve seen hundreds of times. The internal electronics of the original TCM, exposed to years of engine bay heat and vibration, had started to break down. We installed one of our VIN-programmed T42 modules, and in less than an hour, the Yukon was shifting like it just rolled off the factory floor. The problem was solved, and the customer saved hundreds by avoiding a dealership diagnosis and programming fee.

Is Your GMC Yukon Showing These Telltale Signs?

A failing TCM doesn’t always mean a complete transmission breakdown. Often, the symptoms start small and get progressively worse. If you’re experiencing any of the following, your TCM is the likely culprit.

  • ✔ Harsh, slamming, or delayed gear shifts.
  • ✔ The vehicle is stuck in a single gear (often called “limp mode”).
  • ✔ Check Engine Light or Transmission Warning Light is illuminated with codes like P0700, P0750, P0753, P0758, or other solenoid-related faults.
  • ✔ Failure to upshift or downshift properly, leading to poor acceleration.
  • ✔ A noticeable drop in fuel efficiency.
  • ✔ The torque converter fails to lock up at highway speeds.

Your Straightforward 30-Minute Installation Guide

One of the best features of this module is its simple installation. You don’t need to be a master mechanic to get this job done. For a 2007-2009 Yukon Transmission Control Module replacement, the unit is typically located right next to the battery.

  1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
  2. Locate the TCM: On most GMT900 trucks and SUVs like the Yukon, Tahoe, and Sierra, the TCM is mounted in a bracket directly next to the battery in the engine bay.
  3. Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once unplugged, unbolt the module from its mounting bracket.
  4. Install the New Module: Bolt the new, pre-programmed TCM into the bracket and securely reconnect the electrical connectors. You should hear a click as they lock into place.
  5. Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scan tool to clear any stored diagnostic trouble codes (DTCs) from the vehicle’s memory. Start the vehicle and take it for a test drive to confirm smooth shifting.

Verified Fitment For These GM Models

While this part is a direct replacement for the 2007-2009 GMC Yukon, it is also designed to work with a wide array of other General Motors cars, trucks, and SUVs equipped with the T42 controller. Please verify your part number or contact us with your VIN to ensure perfect compatibility.

This module interchanges with part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, and more.

Frequently Asked Questions

Frequently Asked Questions

What is VIN programming and why is it important?

VIN programming involves loading your vehicle’s unique Vehicle Identification Number and the latest GM software onto the module. This ensures the TCM communicates perfectly with your engine, transmission, and other systems for optimal shift patterns and performance, eliminating the need for further dealer intervention.

Do I need to send my old TCM back (core charge)?

No, there is absolutely no core charge or need to return your old part. You can keep it, recycle it, or dispose of it at your convenience.

Is this a new or used part?

This is a top-quality, OEM-standard replacement part, built to meet or exceed original factory specifications and backed by our one-year warranty for your peace of mind.

Will this fix a P0700 trouble code?

A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues. However, if you’re also experiencing shifting symptoms, replacing the TCM is the most likely fix.

Can I install this myself if I have basic tools?

Absolutely. For most vehicles like the GMC Yukon, the replacement requires only basic hand tools (like a 10mm socket or wrench) and can be completed in under 30 minutes. The most important part is ensuring the battery is disconnected before you begin.

Genuine OEM

Yes

Brand

GM

MPN

24238856

Condition

Refurbished

Year

2007 – 2009

Model

YUKON

Hardware Type

Interchange part number

Manufacturer Part Number

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