Fix Your Van’s Transmission Problems for Good
Is your 2006-2014 GMC Savana 1500 van suffering from harsh shifting, getting stuck in gear, or throwing transmission codes? Don’t let a faulty Transmission Control Module (TCM) sideline your workhorse. As a technician with over two decades of experience, I’ve seen how a failing TCM can cause a cascade of frustrating and costly issues. This T42 TCM, part number 24234503, is the reliable, straightforward solution you need to restore your van’s performance and get back on the road with confidence.
The TCM is the brain of your automatic transmission, responsible for managing every gear shift, controlling the torque converter, and monitoring system health. When it fails, you’ll feel it immediately—jerky shifts, delayed engagement from park to drive, or the dreaded “limp mode” that locks you in a single gear. This isn’t just an annoyance; it impacts fuel economy, puts extra strain on mechanical parts, and can be a serious safety concern.
From the Diagnostic Bay: The Case of the Unreliable Work Van
A local contractor brought in his Savana work van, complaining of intermittent, violent 1-2 shifts and occasionally getting stuck in 3rd gear after a long highway drive. His scanner showed a generic P0700 code and a history of solenoid circuit faults. He had already replaced two solenoids with no change. In my shop, I’ve seen this exact scenario hundreds of times. The root cause wasn’t the solenoids, but a failing T42 TCM with internal circuit board fractures from years of heat cycles. We installed one of our VIN-programmed modules, and the van was shifting like new in less than an hour. He avoided a costly diagnostic rabbit hole and got his reliable work vehicle back the same day.
Is Your Savana Van Exhibiting These Transmission Faults?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these can lead to more severe transmission damage.
- ✔ Harsh, banging, or erratic gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related codes.
- ✔ Delayed or no engagement when shifting into Drive or Reverse.
- ✔ A sudden drop in fuel efficiency.
- ✔ The transmission seems to slip between gears.
The Plug-and-Play Solution for Your 2006-2014 Savana 1500 TCM
The biggest hurdle in replacing electronic modules is often the need for expensive dealership programming. We eliminate that step entirely. We pre-program this module to your van’s specific Vehicle Identification Number (VIN) before it ships. This ensures it communicates perfectly with your vehicle’s Engine Control Module (ECM) and other systems right out of the box. No special tools, no software subscriptions, no trip to the dealer—just a simple, direct replacement.
DIY Installation Guide: Get Your Van Shifting Smoothly in Under 30 Minutes
Replacing the TCM on a Savana van is a job most DIYers or any professional can handle with basic tools. On these vans, the module is typically located in the engine compartment on the right-hand (passenger) side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the TCM: Find the module on the RH side of the engine bay. It will have several large electrical connectors attached.
- Disconnect the Connectors: Carefully unclip and remove all electrical harnesses from the old TCM. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the faulty TCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place and securely reconnect all electrical harnesses.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any stored fault codes. Take the van for a test drive to confirm smooth shifting.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24234503 and is interchangeable with many other service numbers. It is compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the Savana, it also fits:
- GMC Savana 1500/2500/3500 Van (2006-2014) – RH engine compartment
- Chevrolet Express 1500/2500/3500 Van (2006-2014) – RH engine compartment
- Chevrolet Silverado & GMC Sierra Pickups (Check specific year/engine) – Next to battery
- Chevrolet Tahoe & GMC Yukon (Check specific year) – Next to battery
- Cadillac, Buick, Pontiac, Saturn, and Hummer models from 2006-2011. Please verify your part number or contact us with your VIN to confirm compatibility.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you time and money.
What information do you need to program it?
We require your vehicle’s 17-digit VIN (Vehicle Identification Number) at checkout to ensure the module is programmed with the correct software for your specific application.
Is this a reliable part?
Absolutely. This module is built to meet or exceed OEM specifications and is rigorously tested for quality and function. It comes with a one-year warranty for your peace of mind.
Where is the TCM located on my 2008 Savana 1500?
On the 2006-2014 Savana and Express vans, the Transmission Control Module is consistently located in the engine compartment on the right-hand (passenger) side.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the ECM to turn on the check engine light. While a faulty TCM is a very common cause, this code indicates that a more specific transmission code is stored in the TCM itself. This module often resolves the underlying issue causing the P0700 code.
Is there a core charge?
No, there is no core charge for this part. You can keep your old module, so you don’t have to worry about the cost or hassle of returning it.