Restore Smooth Shifting to Your 2006-2007 Buick Terraza
If your Buick Terraza is experiencing frustrating and unpredictable transmission problems like harsh shifting, getting stuck in gear, or a persistent check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. As a mechanic with over two decades of diagnostic experience, I’ve seen countless GM vehicles, including the Terraza, sidelined by these exact issues. This OEM-quality T42 TCM, part number 24243901, is the definitive solution. It arrives expertly programmed to your vehicle’s VIN, making the repair straightforward and eliminating the need for an expensive trip to the dealership for programming.
Case Study: The Terraza That Dodged a Transmission Rebuild
A customer brought in their ’07 Terraza with classic symptoms: it would slam into gear from a stop and was stuck in what felt like 3rd gear on the highway (limp mode). They had already been to another shop that quoted them over $3,000 for a full transmission rebuild. After hooking up my scan tool, I saw the tell-tale P0700 and a handful of solenoid circuit codes. Instead of condemning the whole transmission, I inspected the TCM. Based on my experience, I knew the internal electronics on these modules are a common failure point. We swapped in one of our VIN-programmed TCMs, and in under an hour, the van was shifting perfectly. We saved that family thousands of dollars and a lot of unnecessary stress.
Is Your Terraza Exhibiting These Transmission Faults?
A faulty TCM is the central computer for your transmission. When it fails, it can cause a wide range of problems. Look out for these common indicators:
- ✔ Erratic and Harsh Shifting: Abrupt, jerky, or delayed gear changes that make driving uncomfortable and unsafe.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to protect the transmission from further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You may find codes like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other communication faults.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter operation can lead to a noticeable drop in MPG.
- ✔ No Shifting at All: A complete failure to upshift or downshift, leaving you stranded.
Why Choose a Pre-Programmed 2006-2007 Terraza Transmission Control Module?
The single biggest advantage of this module is our in-house VIN programming service. When you order, we flash the unit with your vehicle’s specific software using the latest GM updates. This means the module is truly plug-and-play. You are not just buying a part; you are buying a complete, ready-to-install solution that restores the precise electronic control your transmission needs for optimal performance and longevity. This process ensures perfect communication between the TCM, the engine computer, and the transmission itself.
A Straightforward Guide to Your TCM Installation
For the handy DIYer or professional mechanic, replacing the TCM on a Terraza is a quick job that typically takes less than 30 minutes. No specialized tools are required.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2006-2007 Buick Terraza, the TCM is conveniently located at the driver’s side (LH) strut tower in the engine bay.
- Perform the Swap: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Unbolt the old module from its bracket and set it aside. Bolt the new, pre-programmed module into place.
- Final Connections: Securely plug the electrical connectors into the new TCM. You should hear a click as they lock in. Reconnect the negative battery terminal.
- Clear and Drive: Use a standard OBD2 scan tool to clear any lingering fault codes from the vehicle’s memory. Start the engine and take the vehicle for a test drive to confirm that shifting is smooth and responsive.
Verified Vehicle Compatibility List
While this page focuses on the Buick Terraza, this T42 TCM is compatible with a wide array of General Motors vehicles. Please verify your model and any specific options below. This part is interchangeable with service numbers 24242391, 24234503, 24252114, and others.
TERRAZA 06-07 Transmission; (LH strut tower)
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
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)
Frequently Asked Questions
What exactly does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s specific identification number (VIN) and the corresponding factory software onto the module before we ship it. This ensures it communicates perfectly with your van’s other computers, just like the original part, without needing any dealer intervention.
Do I need to take my Terraza to a mechanic after installation?
No. Our VIN programming service is designed to make this a direct-fit replacement that works right out of the box. You will not need a trip to the dealer or a specialized mechanic for additional programming, saving you significant time and money.
Is this part covered by a warranty?
Absolutely. We stand behind our parts with a one-year warranty, giving you confidence and peace of mind in your repair.
Will this TCM fix my check engine light for a P0700 code?
A P0700 code is a general alert that the TCM has detected a problem. In a vast majority of cases I’ve diagnosed, a faulty TCM is the root cause that triggers this code. Replacing the module with our programmed unit is the most common and effective fix.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it at your convenience, making the transaction simple and hassle-free.