If your 2006-2014 GMC Savana 1500 is experiencing erratic shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re losing time and money. As a technician with over two decades of experience, I’ve seen countless work vans sidelined by a faulty Transmission Control Module (TCM). The original T42 modules are notorious for failing due to heat and vibration, leading to frustrating and often misdiagnosed issues. This replacement T42 TCM, part number 24235753, is the definitive solution to get your workhorse back on the road, performing reliably day in and day out.
The real value here is our professional VIN programming service. Before this module ships, we flash it with your van’s specific Vehicle Identification Number and the latest GM software updates. This means it arrives ready for a true plug-and-play installation. You can bypass the expensive trip to the dealership and the additional costs for programming. For a professional mechanic, this means a faster, more profitable repair. For the DIYer, it means you can confidently tackle this job in your own driveway with basic tools.
Case Study: The Intermittent Savana
A local contractor brought in his 2011 Savana 1500, complaining of intermittent harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode), but only after the van was fully warmed up. He had already spent a small fortune replacing two shift solenoids based on the codes (P0751, P0756), but the problem always returned. After a quick scan and verifying the internal transmission components were fine, my experience pointed directly to the T42 TCM. Heat soak was causing internal circuit failure. We installed one of our pre-programmed modules, and the van was shifting perfectly within 30 minutes. He was back on the job site the same afternoon, a testament to fixing it right the first time.
Is Your Van’s Transmission Acting Up? Common T42 Failure Signs
A failing TCM can mimic a host of other transmission problems. Here’s what to look for when diagnosing your 2006-2014 Savana 1500 TCM:
- ✔ Harsh, delayed, or unpredictable gear shifts that disrupt your drive.
- ✔ The transmission warning light is on, or the Check Engine Light is illuminated with codes like P0700 (Transmission Control System Malfunction) or various solenoid-specific codes.
- ✔ Your van is stuck in “limp mode,” refusing to shift out of 2nd or 3rd gear as a protective measure.
- ✔ Complete loss of communication with the transmission module, preventing diagnostics.
- ✔ A noticeable drop in fuel economy as the transmission fails to operate efficiently.
- ✔ The torque converter clutch fails to lock up at highway speeds, causing higher RPMs.
Get Your Savana Back to Work: A 30-Minute Installation Guide
Replacing the TCM on your Savana is a straightforward job. For this specific model, you’ll find it in the engine compartment. No need for specialized lifts or dropping the transmission pan.
- 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 Savana and Express vans, the TCM is typically mounted on the right-hand (passenger side) of the engine compartment. It’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place to confirm a solid connection.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a moment. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is focused on the 2006-2014 Savana 1500 TCM, it also fits many other models. Please verify your part number (24235753 or an interchange number) or use our vehicle selector for guaranteed fitment.
- GMC: Savana 1500/2500/3500 (2006-2014), Sierra, Yukon, Envoy, Canyon
- Chevrolet: Express 1500/2500/3500 (2006-2014), Silverado, Tahoe, Suburban, Colorado, Impala, Cobalt, HHR
- Buick: LaCrosse, Lucerne, Rainier, Allure
- Cadillac: DTS
- Pontiac: G6, Grand Prix
- And many more GM family vehicles from 2006-2014.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit VIN into the module before shipping. This ensures the TCM communicates perfectly with your van’s engine computer and other systems, just like an OEM part installed at a dealership, but without the extra cost and hassle.
Do I need any special tools for this installation?
No. Basic hand tools, such as a socket set to remove the mounting bolts and potentially a small screwdriver to help with the connector clips, are all that’s required. The entire process typically takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. If your diagnosis points to a faulty module, replacing it with our pre-programmed unit is the correct fix to clear this code and the underlying specific codes it has stored.
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your old, faulty module back to us. This simplifies the process and saves you money on return shipping.
What is the warranty on this part?
This module comes with a one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.