Is Your GM Truck or Van Shifting Erratically?
Is your work truck, van, or family SUV suffering from harsh shifting, getting stuck in gear, or flashing a check engine light? A failing transmission control module (TCM) can sideline your vehicle, costing you time and money. This VIN-programmed GM T42 Transmission Control Module is the direct-fit, no-hassle solution to restore your transmission’s performance and get you back on the road with confidence.
Common Symptoms & Your Solution
A faulty TCM can cause a host of frustrating and potentially damaging issues. If you’re experiencing any of the following, this module is the definitive solution:
- Harsh, Erratic, or Delayed Shifting: Abrupt gear changes, slamming into gear, or a noticeable lag when the transmission should be shifting.
- Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) as a protective measure.
- Warning Lights: An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- Diagnostic Trouble Codes (DTCs): Common codes associated with TCM failure include P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid errors), and other transmission-related faults.
- Poor Fuel Economy: Inefficient shifting patterns can lead to a sudden and noticeable decrease in your vehicle’s MPG.
Features & Benefits
- โ Plug-and-Play Installation: We pre-program this module to your vehicle’s specific VIN using the latest GM software. It arrives ready to install, eliminating the need for an expensive and time-consuming trip to the dealership for programming.
- โ Restored Drivability: Get back the smooth, predictable shifting you depend on. This module corrects erratic behavior, improves transmission response, and ensures proper torque converter lockup for optimal performance.
- โ Engineered for Durability: Built to meet or exceed strict OEM specifications, this module is designed to withstand the demanding conditions of a daily driver or a hard-working truck.
- โ Broad GM Vehicle Compatibility: This is a direct replacement for a wide range of popular GM trucks, vans, and SUVs, including the Savana, Silverado, Tahoe, and Express. It is interchangeable with part numbers 24252114, 24234503, 24240400, and more.
- โ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.
Expert Insight: Why VIN Programming is Non-Negotiable
Many sellers offer unprogrammed or โone-size-fits-allโ modules. This is a critical mistake. Your GM vehicle’s transmission performance is fine-tuned based on its specific engine, axle ratio, and tire sizeโall data linked to the VIN. Our VIN-programming service ensures this GM T42 Transmission Control Module has the exact calibration your vehicle needs to operate as the factory intended. This prevents future shifting problems, protects your transmission from premature wear, and guarantees a smooth, hassle-free repair.
Frequently Asked Questions
Will this module need to be programmed by a dealer?
No. This module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you the time and expense of a dealership visit.
Where is the T42 TCM located on my vehicle?
Location varies by model. Common locations include the engine compartment on the passenger (RH) or driver (LH) side, next to the battery, under the air cleaner box, or on the LH strut tower. The provided fitment data often includes the specific location for your vehicle.
How do I know if my TCM is the problem?
Common signs include erratic or harsh shifting, the vehicle being stuck in “limp mode,” and specific transmission-related diagnostic trouble codes (like P0700). A professional diagnosis is always recommended, but these symptoms strongly point to a failing TCM.
Is this a difficult part to install?
For someone with basic mechanical skills, installation is straightforward and typically takes less than 30 minutes. It involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in reverse order.
What happens if I don’t replace a bad TCM?
Continuing to drive with a faulty TCM can lead to poor fuel economy, unsafe driving conditions, and, most importantly, can cause severe and permanent damage to your transmission’s internal mechanical parts, leading to a much more expensive repair.
Do I need to send my old part back?
No, there is no core charge for this GM T42 Transmission Control Module. You can keep or dispose of your old part without any hassle.