Get Your Workhorse Van Back in Service with a Reliable TCM
If your 2006-2014 Chevrolet Express 2500 Van is struggling with unpredictable shifting, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the likely culprit. As the electronic brain of your automatic transmission (like the 4L80E or 4L60E), the T42 TCM is responsible for every gear change. When it fails, it can bring your work or your journey to a grinding halt. This replacement T42 TCM, part number 24256960, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair.
Case Study: A Tricky Diagnosis
I once had a 2011 Express 2500 from a local plumbing company come into the shop. The complaint was intermittent ‘no-shift’ conditions and a P0700 code that kept coming back. The driver said it would work fine for days, then suddenly refuse to shift out of 2nd gear, crippling their service calls. We checked the wiring and solenoids, which all tested fine. The issue was heat-soak affecting the original TCM. After hours of diagnostics, the fix was simple: replacing the module. This pre-programmed 2006-2014 Express 2500 TCM would have saved them hours of labor and vehicle downtime, as it directly addresses these common electronic failures without the need for further diagnostics or dealership involvement.
Is Your Express Van Showing These Red Flags?
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode,” often in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as the general code P0700 or specific solenoid faults like P0750, P0751, P0752, etc.
- ✔ A complete failure to shift up or down, leading to poor acceleration and terrible fuel economy.
- ✔ Unexplained loss of communication with the transmission module.
A Straightforward Guide to Your TCM Installation
Replacing the 2006-2014 Express 2500 TCM is a job most DIYers or any professional can handle in under 30 minutes. No complex procedures or expensive tools are needed.
- 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 the Express and Savana vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the old module from its mounting bracket.
- Install the New TCM: Mount the new, VIN-programmed module in place of the old one and securely reconnect the wiring harnesses. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. While our programming handles the heavy lifting, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24256960, and more. While this page focuses on the 2006-2014 Express 2500 TCM, it also fits the following models:
- Chevrolet: Avalanche 1500 (07-08), Cobalt (06-10), Colorado (08-12), Express 1500/2500/3500 (06-14), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Silverado 1500/2500 (07-13), SSR (05-06), Suburban 1500 (07-08), Tahoe (07-09), Trailblazer (06-09)
- GMC: Canyon (08-12), Envoy / XL (06-09), Savana 1500/2500/3500 (06-14), Sierra 1500/2500 (07-13), Yukon / XL 1500 (07-09)
- Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Cadillac: DTS (06-11)
- Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06)
- Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
What exactly is VIN programming and why do I need it?
VIN programming loads your vehicle’s unique identification number and specific software parameters onto the module before it ships. This ensures the TCM communicates perfectly with your van’s engine computer and other systems, just like the original part. It eliminates the need for an expensive trip to the dealership for programming.
Do I need to return my old TCM? (Core Charge)
No, there is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of a return shipment.
Will this part fix my transmission slipping?
This module can resolve slipping caused by electronic faults, like incorrect line pressure commands or delayed solenoid activation. However, if your transmission slipping is due to internal mechanical wear (e.g., worn clutch packs), a new TCM will not fix it. A proper diagnosis is key.
Is any other relearn procedure required after installation?
For most vehicles, simply installing the VIN-programmed module and clearing any old codes is sufficient. The module comes loaded with the latest GM software updates, and the vehicle will adapt quickly. No special relearn procedures are typically necessary.
How can I be sure this is the correct part for my van?
The best way is to match the part number from your existing module to 24256960 or one of the interchangeable numbers listed. You can also use our vehicle selector tool or contact our expert support team with your VIN to guarantee a perfect match.