End Transmission Headaches in Your GM Vehicle
Is your 2005-2006 Chevrolet SSR or another GM vehicle suffering from erratic shifting, getting stuck in gear, or throwing transmission codes? Don’t jump to the conclusion of a costly transmission rebuild. Over my 20+ years in the bay, I’ve seen countless cases where the true culprit is a faulty Transmission Control Module (TCM). This VIN-programmed T42 TCM, part number 24241806, is the definitive solution to restore the crisp, predictable performance your vehicle had when it left the factory.
The TCM is the brain of your automatic transmission, controlling everything from shift points and line pressure to torque converter lockup. When it fails, communication between the engine and transmission breaks down, leading to the frustrating and sometimes dangerous symptoms you’re experiencing. This module is pre-programmed to your vehicle’s specific VIN, ensuring it works perfectly right out of the box without any expensive trips to the dealership for flashing or setup. It’s a direct fix for your 2005-2006 SSR TCM and a wide range of other GM cars, trucks, and SUVs.
Case Study: A Tricky Diagnosis
A customer brought in their Silverado with classic signs of a dying transmission—harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). They were quoted over $3,000 for a transmission rebuild at another shop. After connecting my scanner, I saw a P0700 (Transmission Control System Malfunction) and intermittent solenoid circuit codes. Instead of tearing down the transmission, I checked the TCM. Sure enough, it was failing. We swapped in a VIN-programmed module just like this one, and in under an hour, the truck was shifting perfectly. The customer saved thousands and avoided an unnecessary, major repair. This is why properly diagnosing the TCM first is critical.
Is Your GM Vehicle Showing These Telltale Signs?
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0751, P0756, or other solenoid-related DTCs.
- ✔ A noticeable drop in fuel economy.
- ✔ The transmission feels like it’s slipping or failing to engage properly.
- ✔ No communication with the TCM when checked with a professional scan tool.
DIY Installation: A Straightforward Guide
Replacing your 2005-2006 SSR TCM is a job most DIYers can handle in their own driveway in about 30 minutes. The location varies by model, but it’s always accessible in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: Find the old TCM. Common locations include the front left-hand frame rail (for the SSR), next to the battery (Silverado/Tahoe), or under the air cleaner box (Impala/LaCrosse). It’s a silver box with electrical connectors.
- Swap the Part: Carefully unplug the wiring harnesses. Unbolt the old module, set the new one in its place, and secure the bolts. Reconnect the wiring harnesses until they click securely.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a scan tool, it’s good practice to clear any stored fault codes.
Verified Fitment for These GM Models
This T42 TCM is a direct replacement for a vast array of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24252114, 24234503, 24241806, and many more. Please verify your specific model below:
- Chevrolet SSR: 2005-2006 (front LH frame)
- Chevrolet Silverado, Tahoe, Suburban, Avalanche: 2007-2013 (various locations, typically next to battery)
- Chevrolet Express Van: 2006-2014 (RH engine compartment)
- Chevrolet Cobalt, HHR, Impala, Monte Carlo: 2006-2011 (various locations, LH strut tower or under air cleaner)
- GMC Sierra, Yukon, Savana Van: 2006-2014 (various locations, typically next to battery or RH engine compartment)
- Cadillac DTS, Buick Lucerne, LaCrosse: 2006-2011 (various locations, LH or RH engine compartment)
- Pontiac G5, G6, Grand Prix: 2006-2010 (LH strut tower or under air cleaner)
- Hummer H3, Saab 9-7X, Saturn Vue/Aura/Ion: and many more models.
Frequently Asked Questions
What does “VIN Programmed” actually mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s other computers (like the ECM) for optimal shift patterns and performance, eliminating the need for dealer programming.
Do I need any special tools for this installation?
No, basic hand tools like a socket set are all that’s typically required to unbolt the old module and install the new one. A scan tool is helpful for clearing codes but not mandatory for the part to function.
Is there a core charge for my old TCM?
No. We do not require you to send your old part back. You can keep it or dispose of it, making the process simpler and faster for you.
Will this fix a P0700 code?
A P0700 is a general code indicating the TCM has detected a fault. While a failing TCM is a very common cause, this code can also be triggered by other transmission issues. However, if you’re also experiencing symptoms like erratic shifting or limp mode, replacing the TCM is the most likely solution.
What if this doesn’t fix my problem?
This module comes with a one-year warranty. While it is the solution for the vast majority of electronic transmission faults, we stand by our products. Our expert support team is here to help you with any diagnostic questions you may have.