If your 2006-2014 GMC Savana 1500 work van is suddenly shifting hard, getting stuck in gear, or throwing transmission codes, the culprit is often a failed Transmission Control Module (TCM). As the electronic brain of your 4L60E or 4L80E automatic transmission, a faulty TCM can bring your operations to a grinding halt. This replacement T42 TCM, part number 24243901, is the definitive solution to restore your van’s performance and reliability without a costly trip to the dealership.
Over my 20+ years in the bay, I’ve seen countless work vans come in with these exact symptoms. The owner is frustrated because their vehicle is their livelihood. The most common cause, especially in high-mileage vehicles like the Savana, is internal failure of the original TCM due to heat cycles and vibration. This module is engineered to meet or exceed original specifications, providing a dependable, long-term fix.
Case Study: A Tricky Diagnosis
A local contractor brought in his 2011 Savana 2500, complaining of intermittent ‘no-shift’ conditions and a flashing check engine light. His scanner pulled a generic P0700 (Transmission Control System Malfunction). After checking the fluid and wiring harness for obvious damage, we suspected the TCM. The problem was intermittent, making it tough to pin down. Instead of spending hours on speculative diagnostics, we recommended this VIN-programmed module. He installed it himself in about 20 minutes right in our parking lot. The van immediately started shifting perfectly, all codes were cleared, and he was back on the job that same afternoon. This is the power of a pre-programmed, direct-fit part.
Is Your Savana Van Showing These Transmission Problems?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s time to consider a replacement. Ignoring these can lead to more severe transmission damage.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔ The transmission seems to slip between gears under load.
- ✔ No communication with the TCM when using a diagnostic scan tool.
A Straightforward Guide to Your 2006-2014 Savana 1500 TCM Installation
This is a job most DIYers can complete with basic hand tools in under 30 minutes. Our pre-programming means no special equipment is needed.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the GMC Savana and Chevrolet Express vans, the TCM is typically mounted in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to release the locking tabs if necessary. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a minute. Use a basic OBD2 scanner to clear any stored fault codes to complete the reset process.
Verified Fitment For Your General Motors Vehicle
This T42 TCM is a direct replacement for a wide array of GM vehicles equipped with 4-speed automatic transmissions. It is interchangeable with part numbers 24252114, 24234503, 24243901, and more. Please verify your vehicle is on the list below.
This part will fit these makes and models with these options:
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
TAHOE 07-09 Transmission; (next to battery)
SILVERADO 1500 PICKUP 07-13 Transmission; (next to battery)
YUKON 07-09 Transmission; (next to battery)
SIERRA 1500 PICKUP 07-13 Transmission; (next to battery)
AVALANCHE 1500 07-08 Transmission; (next to battery)
SUBURBAN 1500 07-08 Transmission; (next to battery)
ENVOY 06-09 Transmission; (LH engine compartment)
TRAILBLAZER 06-09 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
COLORADO 08-12 Transmission; (RH rear engine compartment)
CANYON 08-12 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
… and many more GM cars, trucks, and SUVs.
Frequently Asked Questions
Do I need to take my van to the dealer for programming?
No. This is the biggest benefit of our service. We program the module to your vehicle’s specific VIN before shipping it. It arrives ready for plug-and-play installation, saving you time and money.
What does a Transmission Control Module (TCM) do?
The TCM is the computer that controls all functions of your automatic transmission. It takes data from engine and wheel speed sensors to determine the perfect time to shift gears, control line pressure, and engage the torque converter clutch for optimal performance and fuel efficiency.
Is this a difficult part to install myself?
Not at all. For most vehicles, including the Savana van, it’s a very straightforward job requiring only basic hand tools. Since it’s located in the engine bay, access is easy, and the entire process usually takes less than 30 minutes.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or recycle it locally without the hassle of shipping it back to us.
Will this fix my P0700 check engine light code?
If the P0700 code is being triggered by an internal TCM failure or related solenoid circuit faults originating from the module, then yes, this part is the correct fix. P0700 is a general code indicating the TCM has detected a problem; this module resolves the root cause.