Is Your Savana 1500 Shifting Erratically?
If your 2006-2014 GMC Savana 1500 is experiencing harsh shifts, delayed gear engagement, or has the check engine light on with transmission-related codes, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can lead to a cascade of problems, from poor fuel economy to being stuck in ‘limp mode.’ This genuine-quality T42 TCM, service part number 24240400, is the definitive solution to restore your van’s transmission performance and reliability.
From the Diagnostic Bay
We had a 2011 Savana 2500 work van come into the shop that was stuck in third gear. The driver said it started with occasional hard shifts between first and second, but he ignored it until the van went into limp mode. The scanner pulled a P0752 for Shift Solenoid ‘A’ Stuck On. A less experienced tech might have immediately dropped the pan to replace the solenoid. However, we know that on these 4L60E/4L80E transmissions, the T42 module itself is a common point of failure that can throw false solenoid codes. We checked the wiring for shorts and found none. Instead of a costly internal transmission repair, we installed a VIN-programmed Savana 1500 Transmission Module. After a 15-minute install and clearing the codes, the van was shifting perfectly. It saved the customer hundreds of dollars and a full day of downtime.
Diagnosing a Faulty Savana 1500 Transmission Module
The T42 TCM is a sophisticated component, but its failure produces distinct and frustrating symptoms. If you’re noticing any of the following issues with your Savana, Sierra, Express, or other compatible GM vehicle, it’s time to consider a replacement. Don’t let a bad module lead to more severe and expensive transmission damage.
- ✔ Erratic and Harsh Shifting: Experiencing sudden, jerky gear changes or a noticeable bang when the transmission shifts.
- ✔ Delayed Engagement: A long pause after shifting from Park into Drive or Reverse before the gear engages.
- ✔ Stuck in Gear / Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to protect the transmission from further damage.
- ✔ Warning Lights: The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (P0750-P0774).
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lock-up caused by the faulty module can lead to a significant drop in MPG.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM at all, indicating a complete failure.
The Plug-and-Play Solution: VIN Programmed for Your Vehicle
Why choose our T42 TCM? Because it eliminates the biggest hassle of electronic module replacement: programming. We handle the complex part for you. Simply provide your vehicle’s VIN during checkout, and we will program the module with the latest GM-certified software specific to your Savana 1500. This ensures that it works seamlessly with your engine control module (ECM) and other vehicle systems right out of the box. No expensive trips to the dealership for programming are required. This is a true plug-and-play fix that gets your van back on the road faster.
Installation is straightforward for a DIY mechanic or any professional technician. On most Savana and Express vans, the TCM is conveniently located in the engine compartment on the right-hand side. The process typically takes less than 30 minutes. Always disconnect the battery before swapping the module to allow the vehicle’s systems to reset. Once installed, reconnect the battery and use a basic OBD2 scanner to clear any stored fault codes. With no core charge, you don’t have to worry about the hassle and expense of sending your old part back.
Frequently Asked Questions
Will this module need to be programmed by a dealer?
No. This Transmission Control Module comes pre-programmed to your vehicle’s specific VIN. This ensures 100% compatibility and allows for a simple plug-and-play installation without any need for additional dealer tools or software.
Where is the TCM located on my 2008 GMC Savana?
On the 2006-2014 GMC Savana and Chevrolet Express vans, the T42 TCM is typically found in the engine compartment, mounted on the right-hand (passenger) side. Always confirm the location before beginning the installation.
Is this part compatible with other GM vehicles?
Yes, this T42 TCM is compatible with a wide range of GM vehicles from 2006-2014 that use 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. This includes many Chevrolet Silverado, Tahoe, GMC Sierra, Yukon, Buick LaCrosse, and Cadillac DTS models. Please check the fitment list to confirm for your specific vehicle.
What happens if I continue driving with a bad TCM?
Continuing to operate a vehicle with a failing TCM can lead to severe and irreversible damage to your transmission. Poor shifting can cause excessive wear on clutches and bands, leading to a complete transmission failure that is far more expensive to fix than replacing the module.
Do you require my old part back (core charge)?
No, there is no core charge for this part. You can keep or dispose of your old module without the hassle of returning it, saving you time and money on shipping.