If your 2006-2014 Chevrolet Express 1500 work van is giving you headaches with harsh shifting, getting stuck in gear, or a lit check engine light, you’re not just losing time—you’re losing money. As a technician with over two decades of experience, I’ve seen countless work vehicles sidelined by a faulty Transmission Control Module (TCM). The T42 module is the brain of your automatic transmission, and when it fails, it can mimic a catastrophic internal failure, leading to expensive and unnecessary diagnostic guesswork. Don’t let a bad module put your business on hold.
This is a direct-fit, OEM-quality T42 Transmission Control Module, a reliable solution for part number 24239926 and its interchanges. The most critical benefit we offer is our expert VIN programming service. Before this module ships, we flash it with the latest GM software calibrated specifically to your Express Van’s VIN. This means it arrives ready for a true plug-and-play installation, eliminating the need for expensive dealership programming or specialized scan tools. It’s the definitive fix for common transmission communication and solenoid codes, restoring the smooth, predictable performance your 4L60E or 4L80E transmission was built for.
Case Study: The Ghost in the Transmission
A local contractor brought in his ’09 Express 1500 with a complaint that stumped two other shops. The van would randomly refuse to shift out of 2nd gear, but only after it was fully warmed up and had been driven for over an hour. There were no consistent codes, just a generic P0700 every now and then. We checked wiring, fluid, and solenoids—all fine. Based on my experience with these T42 modules, I suspected heat-related failure on the circuit board. We installed one of our pre-programmed TCMs, and the problem vanished instantly. The contractor was back on the road the same afternoon, saving him from what could have been a costly and incorrect transmission replacement.
Is Your Express Van Showing These Telltale Signs?
- ✔ Unpredictable, harsh, or delayed gear shifts that slam into gear.
- ✔ The vehicle is stuck in “limp mode,” often only allowing access to 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on with Diagnostic Trouble Codes (DTCs) like P0700, P0750-P0758 (solenoid circuits), or U-series communication codes.
- ✔ Failure to upshift or downshift properly, leading to poor acceleration and terrible fuel mileage.
- ✔ Complete loss of communication with the transmission, making the vehicle undrivable.
Simple Installation to Get Your Van Running Right
Replacing the 2006-2014 Express 1500 TCM is a straightforward job that most DIYers or any professional mechanic can complete in under 30 minutes. No complex procedures or special tools are needed.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electrical work.
- Locate the Module: On the Express and Savana vans, the TCM is typically mounted in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid damaging them. Then, unbolt the old module from its mounting bracket.
- 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: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic scan tool to clear any old fault codes from the vehicle’s memory. Start the engine and test drive to confirm smooth shifting.
Verified Fitment for Your GM Vehicle
This T42 TCM is the correct component for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, 4L70E, and 4L80E). While this page focuses on the 2006-2014 Express 1500 TCM, it also fits the following models. Please verify your specific application.
- Chevrolet: Express/Savana 1500/2500/3500 (2006-2014), Silverado, Tahoe, Suburban, Avalanche, Impala, Monte Carlo, Cobalt, HHR, Colorado
- GMC: Sierra, Yukon, Canyon, Envoy
- Buick: LaCrosse, Lucerne, Allure, Rainier, Rendezvous
- Pontiac: G5, G6, Grand Prix, Pursuit, Montana
- Cadillac: DTS
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
This part is an interchangeable replacement for numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24240400, 24241806, and more.
Frequently Asked Questions
Do I need to have this module programmed by the dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN at checkout, and the module will arrive ready for installation with no extra steps required.
Is this a new or used part?
This is a high-quality, OEM-standard component that has been expertly tested and prepared to ensure it meets or exceeds original performance specifications. It is backed by our one-year warranty.
Where is the TCM located on my 2011 Express Van?
On the 2006-2014 Chevrolet Express and GMC Savana vans, the Transmission Control Module is located in the engine bay, on the passenger side (RH side).
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While a failing TCM is a very common cause, you should scan for more specific P-codes (like solenoid circuit faults) to confirm the diagnosis. In many cases, replacing the TCM will resolve the root cause of the P0700 code.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without the hassle of returning it, saving you time and money on shipping.