Get Your Work Van Back on the Road: A Reliable Fix for Shifting Problems
Is your 2006-2014 GMC Savana 2500 Van struggling with harsh shifts, getting stuck in gear, or showing a check engine light? A failing Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and costly issues. In my 20+ years of diagnostics, I’ve seen countless work vans sidelined by a faulty TCM, leading to downtime and lost revenue. This T42 series TCM, part number 24238856, is the definitive solution, arriving pre-programmed to your van’s specific VIN for a true plug-and-play repair that gets you back to work fast.
Case Study: A Tricky Diagnosis
A local contractor brought in his ’09 Savana 2500. The van would randomly refuse to shift out of 2nd gear, especially on hot days after multiple stops. His scanner showed a generic P0700 (Transmission Control System Malfunction) and an intermittent solenoid code. He had already replaced two shift solenoids with no luck. The problem wasn’t mechanical; it was electronic. The original TCM’s internal circuits were failing under heat soak, causing erratic commands. We installed one of our VIN-programmed T42 modules. The total install time was under 20 minutes, and the van has been shifting perfectly ever since. This is a classic failure mode for these modules, and a new programmed unit is the only permanent fix.
Diagnosing a Faulty 2006-2014 Savana 2500 TCM
A failing TCM doesn’t just affect performance; it can mimic a catastrophic transmission failure, leading to expensive and unnecessary repairs. Before you consider a transmission rebuild, check for these classic symptoms of a bad module. This knowledge can save you thousands.
Common Signs of a Failing TCM
- ✔️ Harsh, banging shifts or delayed gear engagement.
- ✔️ Vehicle is stuck in “limp mode” (typically 2nd or 3rd gear only).
- ✔️ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid circuit faults.
- ✔️ Inability to upshift or downshift, causing poor acceleration and terrible fuel economy.
- ✔️ Complete loss of communication with the TCM (no data on scan tool).
- ✔️ The transmission feels like it’s slipping between gears.
A Straightforward Guide to Installation
You don’t need to be a master technician to replace this module. The job is simple and can be done with basic hand tools in your driveway or shop.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On most Savana and Express vans, the TCM is mounted in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the tab orientation to avoid damage. Then, unbolt the 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.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and allow it to idle for a minute. Use a basic scan tool to clear any stored fault codes and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the 2006-2014 Savana 2500 TCM, it also fits the following models:
- GMC: Savana 1500/2500/3500 Van (06-14), Sierra 1500/2500 (07-13), Yukon (07-09), Envoy (06-09), Canyon (08-12)
- Chevrolet: Express 1500/2500/3500 Van (06-14), Silverado 1500/2500 (07-13), Tahoe (07-09), Suburban 1500 (07-08), Avalanche 1500 (07-08), Colorado (08-12), Cobalt (06-10), Impala (06-11), HHR (06-11), Monte Carlo (06-07), Malibu (06-10), Trailblazer (06-09)
- Buick: LaCrosse (06-09), Lucerne (06-11), Allure (06-09), Rainier (06-07), Rendezvous (06-07)
- Cadillac: DTS (06-11)
- Pontiac: G6 (06-10), G5 (07-10), Grand Prix (06-08), Pursuit (06)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
What does “VIN Programmed” actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your van’s engine computer and other systems, just like a part from the dealer, but without the extra cost and hassle of a dealership visit.
Do I need any special tools for this installation?
No. Basic hand tools like a socket set are all that’s required to unbolt the old module and install the new one. A code reader or scan tool is helpful for clearing old codes, but not always necessary as disconnecting the battery often serves the same purpose.
Is there a core charge for this part?
No, there is absolutely no core charge. You are not required to send your old, faulty module back to us. This saves you time and the cost of return shipping.
Will this fix a P0700 code on my Savana Van?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. If you also have codes for specific solenoids (like P0753 or P0758) or communication errors, replacing the TCM is the most likely solution. This module is designed to resolve those common electronic failures.
How do I know this is the correct part number?
This module, 24238856, is interchangeable with many other GM service numbers, including 24252114, 24234503, 24242391, and more. As long as your vehicle is on our compatibility list, this VIN-programmed module is the correct part for the job.