Is your GMC Savana 2500 work van suffering from transmission problems that are costing you time and money? A faulty Transmission Control Module (TCM) is often the culprit behind frustrating issues like harsh, unpredictable shifting, getting stuck in gear, or a persistent check engine light. This OEM-quality T42 TCM, part number 24243921, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair that gets you back on the road and back to work without a trip to the dealership.
As the electronic brain of your automatic transmission—such as the robust 4L80E found in many Savana vans—this module is responsible for every shift command, torque converter clutch engagement, and diagnostic self-check. When it fails, the symptoms can range from annoying to debilitating. Our replacement module restores the precise, factory-intended operation of your transmission, ensuring smooth gear changes, optimal fuel economy, and long-term reliability for your hardworking vehicle.
Case Study: A Tricky Diagnosis
A local contractor brought in his 2011 Savana 2500, complaining it was stuck in what felt like third gear—a classic case of limp mode. His scanner showed a generic P0700 code. He’d already replaced a couple of shift solenoids with no luck. In my bay, I see this all the time. The internal electronics of the T42 TCM, especially after years of heat cycles in the engine bay, can develop micro-fractures. We confirmed the diagnosis, ordered this VIN-programmed module, and had it installed in under 20 minutes. The van was shifting perfectly on the test drive, and the contractor was back on a job site that afternoon, saving him from another day of lost income.
Is Your Van’s Transmission Acting Up?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, slamming shifts or erratic gear hunting.
- ✔ The vehicle is stuck in limp mode (usually 2nd or 3rd gear) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is on, with DTCs like P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750-P0758).
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Noticeable drop in fuel efficiency and potential transmission overheating.
- ✔ Complete loss of communication with the TCM, preventing diagnostics.
A Straightforward Guide to Your 2006-2014 Savana 2500 Transmission Module Installation
This is a job most DIYers or any professional mechanic can complete quickly. For the GMC Savana / Chevrolet Express vans, the process is particularly accessible.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On your 2006-2014 Savana 2500, the TCM is typically located in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle to avoid damaging the pins or clips. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and use a standard OBD2 scan tool to clear any stored fault codes from the system’s memory. Your installation is complete!
Verified Fitment Across a Range of GM Vehicles
While this is the perfect part for your Savana van, this T42 TCM is also compatible with a wide array of General Motors cars, trucks, and SUVs equipped with 4-speed automatic transmissions. It is a direct replacement for multiple part numbers, including 24252114, 24234503, 24243901, and more. Please verify your vehicle in the list below:
This part will fit these makes and models with these options:
- SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
- SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
- SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
- EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
- SILVERADO 1500 PICKUP 07-13 (Location: next to battery)
- SIERRA 1500 PICKUP 07-13 (Location: next to battery)
- TAHOE / YUKON 07-09 (Location: next to battery)
- IMPALA 06-11 (Location: lower air cleaner housing)
- COBALT / G5 / ION 06-10 (Location: LH strut tower)
- HHR 06-11 (Location: LH engine compartment)
- TRAILBLAZER / ENVOY 06-09 (Location: LH engine compartment)
- …and many more models listed in the compatibility chart.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for installation, with no additional programming or dealer visits required.
Is this a difficult part to install myself?
Not at all. For a Savana van, it’s located in an easy-to-access spot in the engine bay. With basic hand tools, the swap typically takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code indicates a general transmission fault. While a faulty TCM is a very common cause, you should ensure other potential issues (like wiring or solenoids) have been ruled out. In many cases, replacing a bad TCM will resolve the P0700 and related codes.
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.
What kind of warranty is included?
This transmission control module is backed by our one-year, hassle-free warranty for your peace of mind.