Is your 2006-2011 Chevrolet HHR suffering from frustrating transmission issues like harsh, unpredictable shifting, getting stuck in gear, or a persistent check engine light? These are classic signs of a failing Transmission Control Module (TCM). As a technician with over 20 years of experience, I’ve seen how a faulty TCM can sideline an otherwise reliable vehicle. This T42 HHR Transmission Control Module is the definitive, hassle-free solution to restore your vehicle’s performance and drivability.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your vehicle’s specific VIN before shipping. This means you can skip the expensive trip to the dealership for programming. It arrives ready for a true plug-and-play installation, ensuring perfect communication with your HHR’s engine computer and transmission for optimal shift patterns, fuel economy, and reliability right out of the box.
A Technician’s Notebook
I remember a customer bringing in a 2009 HHR that was stuck in what we call ‘limp mode’—it wouldn’t shift past 2nd gear. They had already spent a small fortune at another shop that insisted the transmission needed a full rebuild. After a quick scan, I pulled a P0700 (Transmission Control System Malfunction) code. Instead of tearing down the transmission, I checked the TCM. Sure enough, it had failed. We swapped in a VIN-programmed module, and in less than an hour, the HHR was shifting like it just rolled off the factory floor. It’s a powerful reminder that proper diagnosis saves time and money, and often, the electronic brain is the culprit, not the mechanical parts.
Is Your HHR Showing These Transmission Warning Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s highly likely your module is the problem:
- âś” Abrupt, harsh, or jerky gear shifts.
- âś” The vehicle feels like it’s stuck in one gear (often 2nd or 3rd).
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- âś” Delayed engagement when shifting from Park to Drive or Reverse.
- âś” A noticeable drop in fuel efficiency.
- âś” Complete loss of shifting capability.
Your 30-Minute HHR TCM Installation Guide
Replacing the HHR Transmission Control Module is a straightforward job that most DIY enthusiasts can complete with basic hand tools. For the 2006-2011 HHR, the TCM is conveniently located in the left-hand (driver’s side) engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic component replacement.
- Locate the Module: Open the hood and find the TCM on the driver’s side of the engine bay. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses connected to the old module. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed TCM in the same location and securely fasten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your Chevrolet HHR
This module is a direct-fit replacement for the specified models. It is engineered to meet and exceed original equipment standards for a perfect fit and flawless function.
- Make: Chevrolet
- Model: HHR
- Years: 2006, 2007, 2008, 2009, 2010, 2011
- Location: LH Engine Compartment
- Interchange Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for immediate installation, saving you hundreds in dealership fees.
Is this part difficult to install myself?
Not at all. For the Chevy HHR, this is one of the easier electronic repairs. It’s located in an accessible spot in the engine bay and requires only basic tools. Our step-by-step guide makes the process simple for any DIYer.
What is a core charge? Do I need to send my old part back?
There is absolutely no core charge for this module. You can keep your old part or dispose of it at your convenience without any extra fees or hassle.
What if my transmission is still having issues after installation?
While this module resolves the most common electronic causes of shifting problems, transmission issues can sometimes stem from mechanical failures. If problems persist, it’s wise to have the transmission fluid level and condition checked, as well as the solenoids and wiring for any physical damage.
What does the warranty cover?
This module comes with a comprehensive one-year warranty that covers any defects in materials or workmanship, giving you confidence and peace of mind in your repair.