Restore Peak Transmission Performance in Your GMC Savana
Is your 2006-2014 GMC Savana 1500 experiencing frustrating and unpredictable transmission issues? Symptoms like harsh shifting, delayed gear engagement, or a lit check engine light can point directly to a failing Transmission Control Module (TCM). This critical component is the brain of your automatic transmission, responsible for managing shift points, torque converter lockup, and line pressure. When it fails, it can leave your hardworking van feeling unreliable and even unsafe. This replacement T42 TCM, part number 24238856, is the definitive solution to restore the smooth, dependable operation you rely on.
From the Diagnostic Bay
We had a 2011 Savana 1500 work van come into the shop that was stuck in third gear—classic ‘limp mode.’ The driver was losing time and money on jobs because the van was so unpredictable. After scanning, we found a P0700 code and several solenoid circuit faults. Instead of chasing electrical gremlins for hours, we identified the root cause: a faulty TCM. We installed one of our VIN-programmed T42 modules. The installation took less than 30 minutes, and after clearing the codes, the van was shifting perfectly. The customer was back on the road the same day, a simple fix that saved him from a costly transmission rebuild.
Common Symptoms of a Failing Savana 1500 TCM
A faulty transmission module can manifest in various ways, often starting as minor annoyances and escalating to major performance problems. If your Savana exhibits any of the following signs, it’s time to inspect your TCM. Ignoring these warnings can lead to more significant damage to your transmission’s internal components.
Key Indicators of TCM Failure
- ✔ Erratic Shifting: Experiencing sudden, harsh, or jerky shifts between gears, or a noticeable delay when moving from Park to Drive or Reverse.
- ✔ Stuck in Gear: The transmission may refuse to shift up or down, often getting stuck in a single gear (limp mode) to prevent further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): A scan tool will often reveal codes like P0700 (Transmission Control System Malfunction) or specific solenoid codes (e.g., P0750, P0751).
- ✔ Poor Fuel Economy: Inefficient shifting and incorrect torque converter lockup can cause a significant drop in your van’s gas mileage.
- ✔ No Communication: In severe cases, a scan tool may be unable to communicate with the TCM, indicating a complete module failure.
The Plug-and-Play Solution: VIN Programmed for Your Van
The biggest hurdle in replacing modern electronic modules is the need for expensive dealership programming. We eliminate that step entirely. Each T42 TCM is expertly programmed to your van’s specific Vehicle Identification Number (VIN) before it ships. This ensures that the module has the correct software and calibrations for your exact powertrain configuration. The result is a true plug-and-play installation that restores factory performance without any additional setup. Simply install the module, connect the battery, clear any old codes, and drive away.
This module is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, 24230461, and many more, making it a versatile solution for numerous GM trucks, vans, and SUVs from this era. Built to meet or exceed original equipment standards, it’s backed by a one-year warranty for your peace of mind.
Frequently Asked Questions
Will this part require programming at a dealership?
No. This Transmission Control Module comes pre-programmed to your vehicle’s VIN. This makes it a direct, plug-and-play replacement, saving you the time and expense of a dealership visit.
Where is the TCM located on a 2006-2014 GMC Savana 1500?
On the Savana and Express vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side. Always disconnect the vehicle’s battery before attempting removal or installation.
Can a bad TCM cause a P0700 trouble code?
Yes, absolutely. The P0700 code is a general fault code indicating that the TCM has detected a problem within the transmission control system and has requested the check engine light to be turned on. A failing TCM is a very common cause for this code.
Is this compatible with a 4L60E transmission?
Yes, this T42 TCM is designed to work with several 4-speed GM automatic transmissions, including the 4L60E, 4L65E, 4L70E, and 4L80E commonly found in this generation of GM trucks and vans.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module without any extra fees or hassle.