Restore Your Buick’s Smooth Ride
If your 2006-2009 Buick Allure is suffering from jarring shifts, getting stuck in gear, or throwing transmission-related trouble codes, the cause is very often a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving frustrating and unreliable. I’ve seen it countless times in the shop: a vehicle comes in with what seems like a major transmission failure, but a quick diagnostic points to this module. This T42 TCM, part number YNXS, is the definitive, reliable solution, pre-programmed to your vehicle’s specific VIN for a true plug-and-play fix.
A Technician’s Notebook
I remember a 2008 Buick Allure that came into my bay with a classic complaint: “It shifts fine when it’s cold, but after 20 minutes on the highway, it starts banging into gear and sometimes won’t shift at all.” The owner had already replaced a shift solenoid with no luck. We scanned it and found a generic P0700 code. Instead of chasing ghosts, we checked the TCM data stream and saw erratic readings once the engine bay heated up. Heat soak is a common killer of these modules. We installed one of our VIN-programmed T42 units, and the car was shifting like new in under an hour. The customer avoided a costly, unnecessary transmission rebuild and was back on the road with confidence.
Is Your Allure Exhibiting These Transmission Faults?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time to consider a replacement. This 2006-2009 Allure Transmission Module is designed to correct these exact issues.
- âś” Unpredictable, harsh, or delayed gear shifts.
- âś” The vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750-P0758) are present.
- âś” Failure to upshift or downshift, leading to poor acceleration and fuel economy.
- âś” Intermittent loss of communication with the module.
A Straightforward Guide to Installation
One of the best features of this module is its ease of installation. Because it arrives programmed to your VIN, you can perform the replacement yourself with basic hand tools, saving hundreds in labor and programming fees. For the Buick Allure, the process is especially simple.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On your 2006-2009 Buick Allure, the TCM is conveniently located inside the lower air cleaner housing. You will need to remove the air filter box to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Press the release tabs firmly to avoid damaging them. Then, unbolt the module from its mounting point.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery. While the module is plug-and-play, it’s good practice to use a basic OBD-II scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles. Please verify your model and the specified location notes below. This part is interchangeable with service numbers 24242391, 24234503, 24252114, and YNXS.
- 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)
- EXPRESS/SAVANA VANS 1500/2500/3500 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 06-11 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)
- SIERRA/SILVERADO TRUCKS 07-13 (check notes for location, typically next to battery)
- SSR 05-06 Transmission; (front LH frame)
- SUBURBAN 1500 07-08 Transmission; (next to battery)
- TAHOE 07-09 Transmission; (next to battery)
- TERRAZA 06-07 Transmission; (LH strut tower)
- TRAILBLAZER 06-09 Transmission; (LH engine compartment)
- UPLANDER 06-09 Transmission; (LH strut tower)
- VUE 07-10 Transmission; (check notes for location and engine)
- YUKON/YUKON XL 1500 07-09 Transmission; (next to battery)
What exactly does VIN programming do?
What exactly does VIN programming do?
VIN programming means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping it. This ensures the TCM has the correct shift points, pressure settings, and communication protocols for your specific Buick Allure, making it a true plug-and-play part without requiring a trip to the dealership for expensive calibration.
Is this a difficult part to replace for a DIYer?
Not at all. For a 2006-2009 Buick Allure, this is one of the more accessible DIY repairs. The module is located under the air filter box, and with basic tools, the entire job can typically be completed in under 30 minutes. Our pre-programming service eliminates the most difficult step, which is the dealer-level software flashing.
Will this fix a P0700 check engine light code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem and has requested the check engine light be turned on. When the TCM itself is the source of the failure, replacing it with this quality module will resolve the underlying issue and allow the code to be cleared permanently.
Is there a core charge for my old part?
No, there is no core charge or need to return your old module. This simplifies the process for you, allowing you to complete the repair without the hassle of shipping a core back.