Restore Smooth, Reliable Shifting to Your Chevrolet HHR
If you’re dealing with the frustration of a 2006-2011 Chevrolet HHR that bangs into gear, refuses to shift, or is stuck in limp mode, the problem often points directly to a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for every gear change. Over time, heat, vibration, and electrical stress can cause these critical components to fail, leading to a cascade of performance issues. This T42-series TCM, part number 24252114, is the definitive, hassle-free solution to get your HHR driving like new again.
What sets our module apart is the crucial pre-programming service. We flash the module with your vehicle’s specific VIN and the latest GM software updates before it ever leaves our facility. This means you can skip the expensive trip to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, saving you both time and money. This is the exact fix I’ve recommended in my shop for years to resolve persistent transmission codes and erratic behavior.
From the Diagnostic Bay
A customer brought in their 2009 HHR with a classic complaint: intermittent harsh shifting and the transmission warning light popping on and off. They’d already replaced a shift solenoid based on a code, but the problem persisted. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Experience told me the solenoid wasn’t the root cause. The T42 TCM in these vehicles, located right in the engine bay, endures constant heat cycles. This often leads to failing internal drivers that can’t reliably command the solenoids. We installed one of our pre-programmed TCMs, and the problem was solved instantly. The customer avoided a costly transmission rebuild and was back on the road in under an hour.
Is Your HHR Showing These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your 2006-2011 HHR TCM needs replacement:
- âś” Unpredictable, harsh, or delayed gear shifts.
- âś” The vehicle is stuck in a single gear (often called “limp mode”).
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0751, P0752, P0756, or other solenoid-related faults.
- âś” A sudden drop in fuel economy.
- âś” The transmission seems to slip out of gear.
Your 30-Minute Path to Smoother Shifts
Installing this module is a straightforward job that most DIYers can handle with basic tools. For the 2006-2011 HHR, the TCM is conveniently located in the engine compartment on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the TCM: On the HHR, you’ll find the TCM mounted in the left (driver’s side) engine compartment. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the electrical connectors, making sure they click to confirm they are fully seated.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. While our programming handles the critical setup, it’s always good practice to use a basic OBD-II scanner to clear any lingering fault codes from the ECU.
Verified Fitment for Your GM Vehicle
This T42 Transmission Control Module is a direct replacement for part number 24252114 and is compatible with a wide range of General Motors vehicles. While this page is focused on the 2006-2011 HHR TCM, it also fits many others. Please verify your part number or consult the list below.
This part will fit these makes and models with these options:
HHR 06-11 Transmission; (LH engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
G5 07-10 Transmission; (LH strut tower)
ION 06-07 Transmission; (behind LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
… and many other GM models including the Impala, Malibu, G6, Aura, Vue, and more. Please see the full fitment list provided in the initial data for complete compatibility.
Frequently Asked Questions
Do I need to take my car to the dealer after installation?
No. This module is delivered fully programmed to your vehicle’s VIN. It is a plug-and-play solution that does not require any additional programming or setup at a dealership, saving you hundreds of dollars.
What does ‘VIN Programmed’ mean?
It means we load the specific software and calibration files from GM that match your car’s Vehicle Identification Number (VIN). This ensures the TCM communicates perfectly with your engine and other vehicle systems for optimal shift patterns and performance.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very manageable DIY job. The HHR’s TCM is easily accessible in the engine bay, and the process typically takes less than 30 minutes with standard hand tools.
Do you need my old part back? Is there a core charge?
No, there is no core charge for this part. You can keep your old module or dispose of it responsibly without the hassle of returning it.