Is Your 2006-2011 Chevrolet HHR Experiencing Transmission Problems?
If you’re dealing with erratic shifting, a check engine light that won’t go away, or your HHR is stuck in limp mode, a faulty Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating gear changes, managing fluid pressure, and ensuring smooth, efficient operation. When it fails, it can mimic the symptoms of a catastrophic transmission failure, leading to costly and unnecessary repairs. This VIN-programmed T42 TCM is the definitive solution to restore your vehicle’s performance and get you back on the road with confidence.
The Direct-Fit Solution for Your Vehicle
Specifically designed for a wide range of General Motors vehicles, including the 2006-2011 Chevrolet HHR, this module is a direct replacement for part number 24230461 and other interchangeable service numbers. Unlike generic modules that require expensive trips to the dealership for programming, this unit arrives pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with your HHR’s engine computer and other systems, delivering optimal shift patterns and performance right out of the box. Simply install it, clear any stored codes, and drive.
From the Diagnostic Bay
We had a 2009 HHR come into the shop with classic signs of a dying transmission—harsh 1-2 shifts and occasionally getting stuck in 3rd gear. The owner had already received a quote for over $2,500 for a transmission rebuild. We ran a full diagnostic scan and found a P0752 code (Shift Solenoid ‘A’ Stuck On). While this can be a solenoid issue, experience with the T42 TCM pointed us to the module itself. The internal drivers for the solenoids are a common failure point. Instead of tearing down the transmission, we installed one of our VIN-programmed TCMs. In under an hour, the HHR was shifting perfectly. The customer saved thousands of dollars by correctly diagnosing the electronic failure instead of assuming a mechanical one.
Common Symptoms of a Failing 2006-2011 HHR Transmission Module
- ✔ Harsh, delayed, or erratic gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear, often referred to as “limp mode,” to prevent further damage.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission, preventing the vehicle from moving.
Plug-and-Play Installation
This module is engineered for a straightforward installation. On the Chevrolet HHR, the TCM is typically located in the engine compartment on the driver’s side. The process involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and installing the new one in its place. Once connected, reconnect the battery. While the module is pre-programmed, it’s always best practice to use a standard OBD2 scan tool to clear any lingering fault codes from the vehicle’s memory. With no core charge, you don’t have to worry about the hassle and expense of sending your old part back.
Frequently Asked Questions
What does “VIN Programmed” mean for my HHR?
VIN programming means we load your vehicle’s specific identification number and the latest GM software onto the module before shipping it. This ensures it’s a perfect electronic match for your HHR, allowing for immediate plug-and-play installation without needing a dealership’s expensive programming tools.
Will this fix my P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. This module is often the solution for P0700, especially when accompanied by specific solenoid or shifting codes. By replacing a faulty module, you resolve the root cause of these codes.
Is this an OEM part?
This is an OEM-quality part built to the same specifications and standards as the original module that came in your vehicle. It is designed to provide the same durability and performance as a factory component.
Where is the TCM located on a 2006-2011 Chevy HHR?
On the Chevrolet HHR models from 2006 to 2011, the Transmission Control Module is typically found in the engine compartment, mounted to the driver’s side (LH) of the engine compartment. Always confirm the location on your specific vehicle before beginning the replacement.
Do I need to send my old part back?
No, there is no core charge or requirement to return your old module. This saves you time and money on return shipping, making the repair process simpler and more convenient.