Get Your Sierra 2500 Shifting Like New Again
If your 2007 GMC Sierra 2500 is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As the brain of your automatic transmission, a faulty TCM can make your dependable workhorse feel unpredictable and unsafe. This T42 series TCM, part number YNXS, is the definitive solution, arriving expertly programmed to your truck’s specific VIN. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that restores the crisp, reliable shifting you depend on.
A Technician’s Notebook
I’ll never forget a customer’s 2007 Sierra 2500 that came in on the hook. The truck was stuck in ‘limp mode’ (3rd gear only), and the dash was lit up with a Check Engine light and a transmission warning. The owner was convinced his 4L80E transmission was shot, looking at a multi-thousand-dollar bill. After a quick scan, I saw the classic P0700 and a few solenoid circuit codes. In my experience, this combination on a GM truck often points directly to the TCM. Instead of a full transmission rebuild, we ordered a VIN-programmed module. Less than an hour after it arrived, the new TCM was in, codes were cleared, and the truck was shifting perfectly. It’s a textbook example of how a small electronic part can cause major mechanical symptoms, and why this specific fix is so effective.
Is Your Sierra 2500 Showing These Red Flags?
A failing TCM doesn’t always mean total transmission failure. Often, the signs are intermittent at first. If you’re noticing any of the following, it’s time to inspect your module. A new 2007 Sierra 2500 TCM can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ Check Engine Light is on with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and performance.
- ✔ A noticeable drop in fuel economy.
- ✔ The transmission seems to slip out of gear unexpectedly.
DIY Installation: Get Your Truck Shifting Smoothly in Under an Hour
One of the best features of this module is the simple, straightforward installation. You don’t need a lift or specialized transmission tools. For the 2007 Sierra 2500, the TCM is conveniently located right in the engine bay.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On your Sierra, you’ll typically find the module located next to the battery in the engine compartment. It’s a silver box with a few large electrical connectors.
- Swap the Module: Carefully unplug the wiring harnesses from the old TCM. Unbolt it from its mounting bracket and set it aside. Bolt the new module in its place.
- Reconnect Everything: Securely plug the wiring harnesses into your new TCM. You’ll hear a click as they lock into place. Reconnect the negative battery terminal.
- Final Steps: Start the truck. The new module is pre-programmed, so it’s ready to go. We recommend using a basic OBD2 scan tool to clear any stored fault codes from the previous failure.
Guaranteed Fitment for Your GM Vehicle
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the 2007 Sierra 2500 TCM, please verify your specific model in the list below. This part is interchangeable with service numbers 24252114, 24234503, 24230461, 24234274, and YNXS, among others.
This part will fit these makes and models with these options
ENVOY 08-09 Transmission; (LH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
G5 07-10 Transmission; (LH strut tower)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
VUE 10 Transmission
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
AURA 07-09 Transmission; (LH frame rail front)
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
ALLURE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 08-11 Transmission; (LH engine compartment)
RAINIER 06-07 Transmission
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
SSR 05-06 Transmission; (front LH frame)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
ION 06-07 Transmission; (behind LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
TAHOE 07 Transmission; (next to battery)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
MONTANA 06-09 Transmission; (LH strut tower)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
YUKON 07 Transmission; (next to battery)
G6 06-10 Transmission; (LH strut tower)
HHR 06-11 Transmission; (LH engine compartment)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
AVALANCHE 1500 07-08 Transmission; (next to battery)
COBALT 06-10 Transmission; (LH strut tower)
SIERRA 1500 PICKUP 08 Transmission; (next to battery)
SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
COLORADO 08-12 Transmission; (RH rear engine compartment)
SUBURBAN 1500 07-08 Transmission; (next to battery)
VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
CANYON 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
Frequently Asked Questions
What does VIN programming mean for me?
It means this module is delivered ready for installation. We use your vehicle’s VIN to load the correct GM factory software and calibrations onto the module before we ship it. This eliminates the need for expensive scan tools or a visit to the dealership, saving you time and money.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic hand tools, this is a job that takes less than an hour. The TCM is easily accessible in the engine bay, typically next to the battery on a 2007 Sierra 2500. Just unplug the old one and plug in the new one.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the Check Engine Light. While this module often resolves the underlying issue causing the P0700 (like a bad solenoid driver), you should always diagnose the specific codes stored within the TCM itself for a complete picture.
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 recycle it locally without the hassle of shipping it back.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty. We stand behind the quality and programming of our electronic components, giving you peace of mind with your purchase.