Is your 2007-2013 GMC Sierra 1500 suffering from harsh shifting, getting stuck in gear, or throwing transmission-related trouble codes? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if ignored. This VIN-programmed T42 TCM is the definitive solution to restore your truck’s factory performance and reliability.
From the Diagnostic Bay
We had a 2008 Silverado come in with a classic case of what the owner thought was a bad shift solenoid. The truck would shift hard from 1st to 2nd and occasionally throw a P0752 code (Shift Solenoid A Stuck On). He had already replaced the solenoid himself, but the problem persisted. After hooking up our scanner, we monitored the command signals from the TCM. We saw the command to shift was being sent, but the internal driver circuit within the original TCM was failing intermittently, causing the erratic behavior. We installed one of our VIN-programmed T42 modules, cleared the codes, and the truck shifted perfectly. It’s a common scenario where the root cause isn’t a mechanical part in the transmission, but the electronic module controlling it.
Common Symptoms of a Failing Sierra 1500 TCM
- ✔ Harsh, erratic, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear.
- ✔ Your dashboard displays a Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic scans reveal transmission-specific DTCs like P0700 or solenoid codes.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and performance.
- ✔ A noticeable drop in fuel efficiency as the transmission operates incorrectly.
- ✔ Intermittent loss of communication with the module, causing unpredictable behavior.
Why Choose Our Programmed Sierra 1500 Transmission Module?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. Each module is meticulously programmed to your truck’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the module has the correct software and calibrations for your vehicle’s specific configuration, including engine type, axle ratio, and tire size. This eliminates the need for expensive trips to the dealership for programming. You can install it right out of the box, clear any old codes with a standard scan tool, and get back on the road. Built to meet or exceed original equipment specifications, this module ensures long-lasting durability and dependable performance for your workhorse truck.
Installation is straightforward for a DIY mechanic or professional technician. The TCM is typically located in the engine compartment, often next to the battery, on a strut tower, or near the air cleaner box. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re done. There’s no core charge, so you don’t have to worry about the cost or hassle of sending your old part back.
Guaranteed Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles from 2006-2014 equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, and your specific part number 24234274. Restore the precise, smooth shifting your GM truck or SUV was built for.
Frequently Asked Questions
Why is VIN programming so important for this module?
VIN programming loads your vehicle’s specific software and calibrations onto the module. This ensures it communicates correctly with the Engine Control Module (ECM) and other vehicle systems, controlling shift points, torque converter lockup, and line pressure precisely as the manufacturer intended. Without it, the transmission will not function correctly.
Is this part difficult to install myself?
For someone with basic mechanical skills, the installation is very manageable. It typically involves disconnecting the battery, locating the module in the engine bay, unplugging two electrical connectors, and removing a few bolts. The entire process can often be completed in under 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the Check Engine Light to be turned on. While this module can resolve the underlying issue causing the P0700 (like an internal TCM failure), you should always diagnose the specific codes stored within the TCM itself (e.g., solenoid circuit codes) to confirm the TCM is the culprit.
Do I need to send my old module back?
No, there is absolutely no core charge for this part. You can keep your old module, recycle it, or dispose of it at your convenience without any additional fees or hassle.
What vehicles is this T42 TCM compatible with?
While this listing is focused on the 2007-2013 Sierra 1500, this module fits a wide array of GM vehicles from 2006-2014, including the Chevrolet Silverado, Tahoe, Suburban, Impala; GMC Yukon, Savana; Buick LaCrosse; Cadillac DTS, and many others equipped with a 4-speed automatic transmission.