Restore Peak Performance to Your Buick Allure’s Transmission
If your 2006-2009 Buick Allure is suffering from harsh shifts, getting stuck in gear, or throwing transmission-related check engine lights, you’re likely dealing with a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving frustrating and unpredictable. This T42 series TCM, part number YNXS, is the definitive solution, arriving expertly programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that restores the smooth, reliable performance you expect from your Buick.
From the Diagnostic Bay: The Hidden Culprit
I can’t count the number of times a customer has come into the shop after spending hundreds on transmission solenoids, only for the problem to persist. A classic case was a 2008 Buick Allure with erratic 2-3 shifts and a P0750-range code. The owner was convinced a shift solenoid was bad. After a quick scan and data stream analysis, I saw the command signals from the TCM were dropping out intermittently. The solenoid was fine; the TCM was the real issue. We installed a VIN-programmed module like this one, and the car shifted perfectly. This is why properly diagnosing the TCM first saves time, money, and headaches.
Is Your Buick Showing These Signs of TCM Failure?
- ✔ Abrupt, jerky, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear.
- ✔ Your dashboard is lit up with a Check Engine Light or Transmission Warning Light.
- ✔ A scan tool reveals Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ The transmission refuses to upshift or downshift correctly, or feels like it’s slipping between gears.
A Straightforward Installation Guide for Your Allure
Getting your car back in top shape is a simple process you can do at home. For the 2006-2009 Buick Allure, the TCM is located under the lower air cleaner housing, making it accessible with basic hand tools. The entire job typically takes less than 30 minutes.
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: Find the TCM situated beneath the lower air cleaner housing in the engine bay.
- Disconnect and Remove: Carefully unplug the wiring harness connectors from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New TCM: Mount your new, pre-programmed TCM in the same location, ensuring it’s secure. Reconnect the wiring harness connectors, making sure they click firmly into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s best practice to use a basic scan tool to clear any stored DTCs from the vehicle’s memory to ensure a clean slate.
Verified Fitment for Your General Motors Vehicle
This module is a direct-fit replacement for a wide range of GM vehicles. While this page focuses on the 2006-2009 Allure TCM, it is also compatible with the following models. Always confirm your part number (YNXS) or vehicle for a guaranteed match.
This part will fit these makes and models with these options
ALLURE 06-09 Transmission; (lower air cleaner housing)
AURA 07-09 Transmission; (LH frame rail front)
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)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
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)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
ION 06-07 Transmission; (behind LH strut tower)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
LUCERNE 08-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
MONTANA 06-09 Transmission; (LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
RAINIER 06-07 Transmission
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
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 Transmission; (next to battery)
SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SSR 05-06 Transmission; (front LH frame)
SUBURBAN 1500 07-08 Transmission; (next to battery)
TAHOE 07 Transmission; (next to battery)
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
VUE 10 Transmission
YUKON 07 Transmission; (next to battery)
YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
Do I need to take this part to a dealer for programming?
Do I need to take this part to a dealer for programming?
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 immediate installation, saving you time and money.
Is this a new or used part?
This is a high-quality, OEM-spec recycled part that has been meticulously tested and programmed to meet or exceed original factory standards. It’s a reliable and cost-effective alternative to a new dealer part.
What if my part number is slightly different?
This T42 TCM, including part number YNXS, is interchangeable with many other GM service numbers. Our fitment list is comprehensive, but if you’re unsure, contact us with your VIN and original part number, and our experts will verify compatibility for you.
Is there a core charge for my old TCM?
No, there is no core charge required for this part. You can keep your old module or dispose of it at your convenience without the hassle of shipping it back.
What kind of warranty is included?
We stand behind our products with a one-year warranty. This gives you peace of mind that you’re installing a quality part that’s built to last.