If your 2006-2009 Chevrolet Uplander is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, you’re likely dealing with a failed Transmission Control Module (TCM). As an experienced technician, I’ve seen firsthand how a faulty TCM can make a reliable family minivan feel unsafe and unpredictable. This isn’t just an annoyance; it’s a critical component failure that compromises drivability. Don’t let shifting problems strand you. This VIN-programmed T42 TCM is the definitive, long-term solution.
This module, corresponding to part number 24234274 and other interchanges, is the electronic brain of your automatic transmission. It precisely manages hydraulic pressure, shift solenoid timing, and torque converter lockup. When it fails, the communication breaks down, leading to the harsh bangs, delayed shifts, and poor fuel economy you’re experiencing. Our process eliminates the guesswork and high dealership costs. We program the module to your Uplander’s specific VIN before shipping, making it a true plug-and-play part.
From the Diagnostic Bay
I recall a 2008 Uplander that came into the shop. The customer was frustrated—the van would shift hard from 1st to 2nd, and occasionally it would refuse to shift past 2nd gear altogether, triggering a P0700 code. They were worried about a costly transmission rebuild. After a quick scan and verifying power and ground at the TCM connector, we identified the module itself as the culprit. Instead of a multi-day repair involving a trip to the dealer for programming, we installed one of our pre-programmed T42 modules. The whole job took less than an hour, the codes cleared, and the van shifted like new. It’s a common and straightforward fix for these symptoms.
Is Your Uplander Exhibiting These Transmission Issues?
A failing TCM will give you clear warning signs. If you’re noticing any of the following, it’s time for a replacement. A new 2006-2009 Uplander TCM is often the only fix needed to resolve these problems.
- âś” Harsh, banging, or erratic gear shifts.
- âś” Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- âś” Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid circuit faults.
- âś” Failure to upshift or downshift correctly.
- âś” Noticeable decrease in fuel efficiency.
- âś” The transmission feels like it’s slipping between gears.
DIY-Friendly Installation: A 30-Minute Fix
One of the best parts about this solution is how simple the installation is. You don’t need to be a professional mechanic to get your Uplander running right again. For the 2006-2009 Uplander, the TCM is conveniently located and easy to access.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your Uplander, the TCM is typically found mounted on the driver’s side strut tower in the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Bolt your new, pre-programmed module into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your Vehicle
While this part is a direct replacement for the 2006-2009 Chevrolet Uplander, the T42 TCM was used across a wide range of General Motors vehicles. This module is guaranteed to be compatible with the following models and configurations:
- Chevrolet Uplander: 2006, 2007, 2008, 2009 (Transmission; LH strut tower)
- Buick Terraza: 2006-2007 (Transmission; LH strut tower)
- Pontiac Montana: 2006-2009 (Transmission; LH strut tower)
- Saturn Relay: 2006-2007 (This model shares the same platform and TCM)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please verify your part number or contact us to confirm fitment. This part interchanges with 24252114, 24234503, 24230461, and more.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. The main benefit of our service is that we pre-program the module to your vehicle’s VIN before we ship it. This makes it a true plug-and-play installation, saving you time and the high cost of dealership programming.
Where is the TCM located on a 2007 Chevy Uplander?
On the 2006-2009 Chevrolet Uplander, the Transmission Control Module (TCM) is located in the engine bay, mounted to the top of the driver’s side (LH) strut tower. It is easily accessible once you open the hood.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and requested the check engine light. While this module often resolves the root cause (like an internal TCM failure), you should always scan for other specific codes (e.g., P0753, P0758) to confirm the diagnosis. In many cases, replacing a faulty TCM will clear the P0700 and related codes.
What is the difference between a TCM and a PCM?
The Powertrain Control Module (PCM) is the main computer for the engine. The Transmission Control Module (TCM) is a separate computer dedicated solely to managing the automatic transmission’s functions. In many modern vehicles, these are separate units to handle the complex processing required for each system.
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 without the hassle of returning it, simplifying your repair process.