Restore Flawless Shifting to Your Chevrolet Suburban
Is your 2007-2008 Chevrolet Suburban 1500 suffering from erratic shifting, getting stuck in gear, or throwing transmission-related trouble codes? You’re not just dealing with an annoyance; you’re facing a common failure point: the Transmission Control Module (TCM). As an automotive diagnostics expert with over two decades of experience, I’ve seen firsthand how a failing TCM can sideline an otherwise reliable truck. This T42 Transmission Control Module, part number YNXS, is the definitive, hassle-free solution to restore your vehicle’s performance and get you back on the road with confidence.
The core of the problem often lies in the complex electronics that manage your transmission’s every move. This module is the brain behind your 4L60E, 4L65E, or 4L70E automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, the symptoms can range from poor fuel economy to a complete loss of shifting. Our module is the answer, providing a reliable fix that integrates seamlessly with your vehicle’s systems.
From the Diagnostic Bay: A Suburban’s Ghost in the Machine
I remember a 2008 Suburban 1500 that came into my shop with a frustratingly intermittent problem. The owner complained of sudden, harsh downshifts on the highway and occasional failure to shift out of 2nd gear from a stop. No check engine light was on, but my professional scan tool pulled a stored history code, P0750 (Shift Solenoid ‘A’ Malfunction). We tested the solenoids, and they were fine. The wiring harness looked pristine. After hours of chasing this electrical ghost, we traced the fault back to the T42 TCM. The module was intermittently failing to send the correct voltage to the solenoid. Swapping in a VIN-programmed TCM like this one solved the problem instantly. The customer was back on the road in under an hour, his Suburban shifting smoother than ever.
Is Your Suburban Showing These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your 2007-2008 Suburban 1500 TCM needs replacement:
- âś” Unpredictable, harsh, or delayed gear shifts.
- âś” The vehicle is stuck in a single gear, often called “limp mode.”
- âś” An illuminated Check Engine Light or Transmission Warning Light.
- âś” Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- âś” A sudden drop in fuel efficiency for no apparent reason.
- âś” Complete failure to upshift or downshift, making driving difficult or impossible.
A Straightforward Guide to Installation
One of the best features of this module is its simple, plug-and-play installation. Because we program it to your vehicle’s specific VIN before shipping, you can avoid a costly and time-consuming trip to the dealership. Most DIYers can complete this job in under 30 minutes with basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the onboard computer systems.
- Locate the TCM: On your Suburban, the TCM is typically found in the engine compartment, mounted next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place and securely reconnect the electrical connectors. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the system often resets itself, it’s good practice to use a basic OBD2 scanner to clear any lingering fault codes. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page is dedicated to the 2007-2008 Suburban 1500 TCM, this part is also compatible with the following models. Please verify your specific model and options.
- Chevrolet: Suburban 1500 (07-08), Tahoe (07-09), Silverado 1500/2500 (07-13), Avalanche 1500 (07-08), Express Van (06-14), Cobalt (06-10), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Colorado (08-12)
- GMC: Yukon / Yukon XL 1500 (07-09), Sierra 1500/2500 (07-13), Savana Van (06-14), Envoy (06-09), Canyon (08-12)
- Cadillac: DTS (06-11)
- Buick: LaCrosse (06-09), Lucerne (06-11), Allure (06-09), Rainier (06-07), Rendezvous (06-07)
- Pontiac: G6 (06-10), Grand Prix (06-08), G5 (07-10)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
This module interchanges with part numbers: 24242391, 24234503, 24252114, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and YNXS.
What does ‘VIN Programmed’ mean for me?
What does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) onto the module before we ship it. This ensures the TCM has the correct software and calibrations for your specific Suburban, making it a true plug-and-play part. You won’t need any additional programming from a mechanic or dealership, saving you hundreds of dollars.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the process simpler and more convenient for you.
Is this a difficult part for a DIYer to install?
Not at all. Thanks to the VIN programming, the installation is purely mechanical. If you can use a basic socket wrench and disconnect a battery, you have the skills needed. It’s one of the more straightforward electronic component replacements you can do.
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, it’s important to scan for other transmission-specific codes (like P07xx) to confirm the TCM is the root cause.
What kind of warranty comes with this part?
This Transmission Control Module is backed by our comprehensive one-year warranty, giving you peace of mind and confidence in your repair.