Get Your Workhorse Van Back on the Job with a Reliable Transmission Brain
If your 2006-2014 Chevrolet Express 2500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the problem is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I know that for a work vehicle like the Express, downtime is lost money. This T42 TCM, part number 24234274, is the definitive, no-hassle solution. It arrives expertly pre-programmed to your van’s specific VIN, eliminating the need for expensive dealership programming. This isn’t just a part; it’s a fast track to restoring the dependable performance your business relies on, controlling everything from gear changes to torque converter lockup for optimal function and fuel economy.
Case Study: A Tricky Diagnosis
A local contractor brought in his 2011 Express 2500, complaining of intermittent ‘limp mode’ that would happen under heavy load. His scanner showed a generic P0700 transmission fault, but no specific solenoid codes. After checking the wiring harness and fluid, everything seemed fine. From experience, I know these T42 modules can develop internal faults that don’t always throw a specific code. We installed one of our VIN-programmed modules, and the problem was solved instantly. The pre-programming saved him a full day of downtime and the high cost of a dealership visit, getting his van back to earning money on the job site.
Is Your Express Van Showing These Symptoms?
A faulty TCM can manifest in several ways that disrupt your van’s performance. Here are the most common signs I see in the shop:
- ✔ Unpredictable or harsh gear shifts, and jarring when engaging Drive or Reverse.
- ✔ Transmission gets stuck in one gear (often 2nd or 3rd), a condition known as “limp mode.”
- ✔ The Check Engine Light or a specific transmission warning light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are stored, such as the general P0700 or specific solenoid codes like P0750.
- ✔ A noticeable drop in fuel efficiency or the transmission running hotter than usual.
- ✔ Complete failure to shift, or intermittent loss of communication with the module.
A Straightforward Guide to Installation
Replacing the 2006-2014 Express 2500 TCM is a job most DIYers or any professional can handle in under 30 minutes. The module is conveniently located and requires no special programming tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On the Express and Savana vans, you’ll find the TCM mounted in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts holding the old module in place.
- Install the New TCM: Mount your new, VIN-programmed module and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s best practice to use a basic scan tool to clear any old fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this listing is for the 2006-2014 Express 2500 TCM, it also fits the following models. Always confirm your part number (24234274 or an interchange) for a perfect match.
- Chevrolet: Express/Savana 1500/2500/3500 (06-14), Silverado 1500/2500 (07-13), Tahoe (07-09), Suburban 1500 (07-08), Avalanche 1500 (07-08), Impala (06-11), Monte Carlo (06-07), Cobalt (06-10), HHR (06-11), Colorado (08-12)
- GMC: Sierra 1500/2500 (07-13), Yukon/Yukon XL 1500 (07-08), Envoy (06-09), Canyon (08-12)
- Buick: LaCrosse (06-09), Lucerne (06-11), Allure (06-09), Rendezvous (06-07), Rainier (06-07)
- Cadillac: DTS (06-11)
- Pontiac: G6 (06-10), Grand Prix (06-08), G5 (07-10), Pursuit (06)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
This module replaces part numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more.
Frequently Asked Questions
Do I need to take my van to the dealer after installation?
No. This module is delivered pre-programmed to your van’s VIN. This ensures it communicates correctly with your vehicle’s other systems right out of the box, saving you the time and expense of a dealership visit.
What transmission does this TCM work with?
This T42 TCM is designed for vehicles equipped with GM’s 4-speed automatic transmissions, including the 4L60E, 4L65E, 4L70E, and the heavy-duty 4L80E commonly found in the Express 2500 van.
Is a core charge required for my old part?
No, there is no core charge. You can keep your old part, which simplifies the process and saves you the hassle and cost of return shipping.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a failing TCM is a very common cause, you should ensure other issues like wiring or solenoids are not at fault. However, in many cases, replacing the module is the correct fix for this code and the related performance issues.