If your 2006-2011 Chevrolet HHR is suffering from frustrating transmission issues like harsh shifting, getting stuck in gear, or an illuminated check engine light, you’ve likely pinpointed a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving unpredictable and unsafe. This is a direct-fit, OEM-quality T42 TCM, part number 24241806, that arrives expertly programmed to your vehicle’s specific VIN. This crucial step ensures it works perfectly right out of the box, eliminating the need for expensive dealership programming and getting your HHR back to shifting smoothly and reliably.
Is Your HHR Exhibiting These Transmission Problems?
A failing TCM often creates a cascade of noticeable issues. In my 20+ years of experience, these are the most common symptoms I’ve seen tied directly to a bad module on these GM platforms. If you’re experiencing any of these, a replacement 2006-2011 HHR TCM is the most likely solution.
- ✔ Abrupt, jerky, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear as a safety precaution.
- ✔ Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and terrible fuel mileage.
- ✔ Intermittent loss of communication with the module, causing unpredictable performance.
Case Study: A Tricky Diagnosis
A customer brought in an ’09 HHR with a classic complaint: it shifted perfectly when cold, but after 20 minutes of driving, it would start slamming into gear and occasionally get stuck in 3rd. They had already replaced two shift solenoids with no success. After hooking up my scan tool and monitoring live data, I saw the TCM was dropping communication intermittently as the engine bay heated up. This heat-soak failure is incredibly common. We installed one of our VIN-programmed T42 modules, and the problem was solved instantly. This part prevents you from chasing expensive mechanical ghosts when the real culprit is electronic.
A Straightforward Guide to Installation
For the Chevy HHR, this is a repair most DIYers can handle in their own driveway in under 30 minutes. The module is conveniently located and requires basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic work.
- Locate the Module: On the 2006-2011 HHR, the TCM is found in the left-hand (driver’s side) of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as old plastic can be brittle. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new module into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While our VIN programming handles the critical setup, it’s good practice to use a basic scan tool to clear any stored fault codes from the system’s memory.
Verified Vehicle Compatibility
While this is the correct part for the 2006-2011 HHR TCM, this versatile T42 module also fits a wide range of other General Motors vehicles. Please confirm your specific model and year below. This part is a direct replacement for service numbers including 24242391, 24234503, 24252114, 24241806, and more.
- Chevrolet HHR (2006-2011): Transmission; (LH engine compartment)
- Chevrolet Cobalt (2006-2010): Transmission; (LH strut tower)
- Chevrolet Impala (2006-2011): Transmission; (lower air cleaner housing)
- Pontiac G5/G6 (2006-2010): Transmission; (LH strut tower)
- Saturn Aura (2007-2009): Transmission; (LH frame rail front)
- Saturn Ion (2006-07): Transmission; (behind LH strut tower)
- And many more GM models including select years of the Silverado, Tahoe, Yukon, Sierra, Savana, Express, LaCrosse, Lucerne, DTS, Hummer H3, and Saab 9-7X.
Frequently Asked Questions
Do I need to do any programming after installation?
No. This module comes pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you a trip to the dealership and additional costs.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part, fully tested and programmed with the latest GM software updates to ensure reliability and performance. It comes with a one-year warranty.
Where is the TCM located on my 2008 HHR?
On the 2006-2011 Chevrolet HHR, the Transmission Control Module is located in the engine compartment on the driver’s side (LH side).
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main computer. While this module often resolves the root cause (like a failed solenoid driver circuit), it’s essential to check for other transmission-specific codes that will point to the exact issue. In many cases, replacing a faulty TCM will clear the P0700 code and its underlying cause.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part, which simplifies the buying process for you.