If you’re dealing with the headaches of a faulty transmission in your 2007-2009 GMC Yukon, you know how frustrating it can be. One minute your SUV is driving perfectly, the next it’s slamming into gear, refusing to shift, or throwing a check engine light that sends you into limp mode. As a technician with over two decades of experience, I’ve seen this exact scenario countless times. The culprit is often a failing Transmission Control Module (TCM), the electronic brain of your automatic transmission.
This T42 TCM, part number 24252114, is the definitive, reliable fix for these pervasive issues. It’s not just a replacement part; it’s a pre-programmed, plug-and-play solution designed to restore your vehicle’s factory performance without a costly trip to the dealership. We handle the programming for you—just provide your VIN at checkout, and we’ll flash the module with the latest GM software specific to your Yukon. This ensures perfect communication between your engine and transmission, restoring smooth shifts, proper torque converter lockup, and accurate diagnostics from the moment you install it.
Is Your Yukon Exhibiting These Transmission Nightmares?
A failing TCM can manifest in several ways, often starting as an intermittent annoyance before becoming a major problem. Here are the tell-tale signs I look for during diagnostics:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often 2nd or 3rd), a condition known as “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction), P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly, leading to poor acceleration and terrible fuel mileage.
- ✔ The transmission feels like it’s slipping between gears.
- ✔ Complete loss of communication with the TCM, preventing the vehicle from starting or shifting out of park.
A Technician’s Notebook: The Case of the Confused Silverado
A customer brought in a 2008 Silverado with a 4L60E, complaining of random, violent downshifts on the highway. His scanner showed a generic P0700 code, but no specific solenoid faults. He’d already replaced two shift solenoids with no luck. In my experience, when you see erratic behavior without a clear mechanical cause, the logic center is the first place to look. We swapped in a VIN-programmed T42 TCM, and the problem vanished instantly. The original module’s internal processors were failing under heat, causing it to send corrupted signals. This part solves that root electrical failure, not just the symptoms.
Your Plug-and-Play Solution: A Straightforward Installation Guide
Installing your new 2007-2009 Yukon TCM is a job most DIYers can handle in their driveway in under 30 minutes. No specialized tools are needed.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On most GMT900 trucks and SUVs like your Yukon, the TCM is conveniently located in the engine bay, typically next to the battery or under the air cleaner box. It’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. There are usually two or three small bolts holding it in place.
- Install the New TCM: Mount the new, pre-programmed module in the same location and securely fasten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any lingering fault codes from the vehicle’s memory. Start the engine and enjoy your smooth-shifting transmission!
Verified Vehicle Compatibility for Part 24252114
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, and 4L70E). While this page focuses on the 2007-2009 Yukon TCM, it also fits the following models. Please verify your specific application.
This part will fit these makes and models with these options:
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
GMC YUKON 07-09 Transmission; (next to battery)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SIERRA 1500 PICKUP 08-13 Transmission; (next to battery), w/o hybrid option
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 08-13 Transmission; (next to battery), w/o hybrid option
SUBURBAN 1500 07-08 Transmission; (next to battery)
TAHOE 07-09 Transmission; (next to battery)
TRAILBLAZER 06-09 Transmission; (LH engine compartment), (8 cylinder models for 06-07)
And many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Frequently Asked Questions
Do I need to take my Yukon to the dealer for programming?
No. This module comes fully pre-programmed to your vehicle’s specific VIN. It is a true plug-and-play solution, saving you hundreds in dealership programming fees.
Is this compatible with part number 24234503 or 24242391?
Yes, this part number 24252114 is a direct replacement and interchangeable with a long list of GM service numbers, including 24234503, 24242391, 24256960, and others. It is the correct T42 module for these applications.
Will this fix a P0700 code?
A P0700 is a general code indicating a fault in the transmission control system. In many cases, a failing TCM is the root cause, and replacing it will resolve the code. However, you should always ensure other potential issues (like wiring or solenoids) have been ruled out.
What is the warranty on this part?
This module is backed by a one-year warranty, ensuring it provides lasting reliability and performance for your vehicle.
Is there a core charge?
No, there is no core charge. You can keep your old part, so there’s no need to worry about shipping it back.