Are you experiencing frustrating and unpredictable shifting in your 2006-2011 Chevrolet HHR? A faulty Transmission Control Module (TCM) is often the culprit behind issues like harsh gear changes, getting stuck in limp mode, or an illuminated check engine light. This VIN-programmed GM T42 TCM, service number 24235340, is the definitive solution to restore your vehicle’s transmission performance and drivability. It arrives ready for a straightforward, plug-and-play installation, eliminating the need for expensive dealership programming.
Expert Pro Tip: Before replacing your TCM, always inspect the vehicle’s main battery connections and the primary ground wires. A poor connection can cause low voltage, which often mimics the symptoms of a failing module, leading to unnecessary repairs. A simple check can save you time and money.
Common Symptoms of a Failing HHR TCM
If your vehicle’s computer has stored diagnostic trouble codes (DTCs) like P0700, P0750, or other solenoid-related faults, it’s a strong indicator that the TCM needs attention. Look out for these common warning signs:
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle is stuck in one gear (limp mode), typically 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Failure to upshift or downshift properly.
- ✔ Noticeable decrease in fuel economy.
- ✔ Slipping gears or a feeling of power loss during acceleration.
Key Features of the 2006-2011 HHR Transmission Module
This module is engineered to meet or exceed original equipment specifications, ensuring reliable and long-lasting performance. By managing critical functions like shift timing, line pressure, and torque converter lockup, it brings back the smooth, efficient operation you expect from your vehicle.
Plug-and-Play Installation: The most significant benefit is our pre-programming service. We flash the module with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software updates. This ensures perfect communication between the TCM and your HHR’s other computer systems right out of the box. No trips to the dealer, no special tools required.
Wide Compatibility: While this listing is focused on the 2006-2011 HHR, this T42 TCM is a direct replacement for a vast range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24242391, and more, making it a versatile solution for many GM cars, trucks, and SUVs.
Simple Installation: For the Chevrolet HHR, the TCM is typically located in the left-hand (driver’s side) engine compartment. The replacement process is straightforward and can usually be completed in under 30 minutes with basic hand tools. Simply disconnect the battery, unbolt the old module, disconnect the wiring harnesses, and install the new one in its place. Once reconnected, the pre-programmed module will take over seamlessly.
Frequently Asked Questions
What does a Transmission Control Module do?
The TCM acts as the brain for your automatic transmission. It uses data from various sensors on the engine and transmission to control exactly when and how the transmission shifts gears, ensuring optimal performance, fuel efficiency, and smooth operation.
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibrations onto the module. Without it, the TCM won’t be able to communicate correctly with your vehicle’s engine computer and other systems, leading to continued shifting problems or the vehicle not starting at all. Our service saves you a trip to the dealership and ensures a successful repair.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code, meaning the TCM has detected a problem and has requested the check engine light to be turned on. While a faulty TCM can cause a P0700, it’s important to scan for other transmission-specific codes (e.g., P0751, P0756) to pinpoint the exact issue. In many cases, replacing a failed TCM will resolve the root cause of the P0700 code.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very manageable DIY job. On the HHR, the module is easily accessible in the engine bay. The key is to disconnect the battery first. Since our module is pre-programmed, there are no complex electronic procedures required after installation.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module, recycle it, or dispose of it at your convenience without any extra hassle or fees.