Fix Your Yukon’s Shifting Problems for Good
Is your 2007-2008 GMC Yukon XL 1500 suffering from harsh, unpredictable shifting, getting stuck in gear, or throwing transmission codes? As a technician with over two decades of experience, I’ve seen these symptoms countless times. The culprit is often a failing Transmission Control Module (TCM). This T42 TCM, part number 24234503, is the definitive solution. It arrives expertly programmed to your vehicle’s specific VIN, eliminating the need for an expensive and time-consuming trip to the dealership. This isn’t just a part; it’s a direct-fit, plug-and-play fix that restores the smooth, reliable performance you expect from your truck.
Case Study: The Misleading Solenoid Codes
A customer brought in a 2008 Yukon XL that was stuck in third gear—classic limp mode. The dash was lit up, and his local shop had quoted him for a full set of shift solenoids based on the codes. I hooked up my professional scanner and saw the solenoid circuit codes, but my experience told me to dig deeper. The solenoids themselves tested fine. The real issue was the driver circuit inside the original TCM; it had failed and could no longer command the solenoids correctly. We installed one of our VIN-programmed T42 modules, and in less than an hour, the truck was shifting perfectly. He saved hundreds by avoiding an unnecessary internal transmission repair.
Is Your Yukon Exhibiting These Telltale Signs?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement. A faulty 2007-2008 Yukon XL 1500 TCM is a common point of failure, but it’s a straightforward fix.
- ✔ Unusually hard or jarring shifts between gears.
- ✔ The vehicle feels sluggish or refuses to shift out of a low gear (limp mode).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0751, P0756, or other solenoid-specific codes.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
A Straightforward Guide to Installation
One of the best features of this module is how simple it is to install. For the DIYer, this is a job you can complete in your driveway in under 30 minutes with basic hand tools. For the professional, it’s a quick, reliable repair that gets the vehicle back to the customer fast.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your 2007-2008 Yukon XL 1500, the TCM is conveniently located in the engine bay, right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. You’ll hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and take it for a test drive to confirm smooth shifting.
Will This Fit My Vehicle?
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 it is guaranteed to fit the 2007-2008 Yukon XL 1500 TCM application, please verify your model in the list below.
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 06-09 Transmission; (LH engine compartment)
EXPRESS 1500/2500/3500 VAN 06-14 Transmission; (RH engine compartment)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
SAVANA 1500/2500/3500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 07-13 Transmission; (next to battery)
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 1500 PICKUP 07-13 Transmission; (next to battery)
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SUBURBAN 1500 07-08 Transmission; (next to battery)
TAHOE 07-09 Transmission; (next to battery)
TRAILBLAZER 06-09 Transmission; (LH engine compartment)
YUKON 07-09 Transmission; (next to battery)
YUKON XL 1500 07-08 Transmission; (next to battery)
…and many other GM, Buick, Cadillac, Pontiac, and Saturn models. Refer to the full interchange list for details.
Do I need to have this module programmed by a dealer?
Do I need to have this module programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN at checkout, and the module will arrive ready for plug-and-play installation. This saves you from the extra cost and hassle of a dealership visit.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part that has been expertly reconditioned and programmed with the latest GM software. It is fully tested to meet or exceed original performance and comes with a one-year warranty for your peace of mind.
What happens if I don’t provide a VIN?
Providing your VIN is crucial for ensuring 100% correct functionality. If a VIN is not provided, we cannot program the module, and it will not work correctly in your vehicle. This will also delay the shipment of your order.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep your old module or dispose of it without the need to send it back to us, making the repair process simpler and more convenient for you.