Is your 2006-2011 Chevrolet HHR suffering from harsh shifting, getting stuck in gear, or throwing transmission-related check engine light codes? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating smooth gear changes, managing torque converter lockup, and monitoring overall transmission health. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed.
This genuine GM T42 Transmission Control Module, part number 24241806, is the definitive solution to restore your vehicle’s shifting performance. We take the guesswork and dealership hassle out of the equation by pre-programming the module to your HHR’s specific Vehicle Identification Number (VIN). This ensures that the unit arrives at your door ready for a true plug-and-play installation, loaded with the latest GM software updates for optimal function. You get a reliable, OEM-quality part that communicates flawlessly with your vehicle’s other systems, eliminating the need for expensive post-installation programming.
From the Diagnostic Bay
We had a 2009 HHR come into the shop with classic limp-mode symptoms—stuck in 3rd gear with a P0700 code. The owner had already spent a small fortune replacing shift solenoids based on a generic code reader’s output, but the problem persisted. After a quick scan with professional equipment, we identified communication errors pointing directly to the TCM. Instead of continuing to throw parts at it, we installed a VIN-programmed T42 module. The car immediately shifted perfectly on the test drive, and all codes were cleared. It’s a prime example of how targeting the electronic controller first can save significant time and money.
Common Symptoms of a Failing 2006-2011 HHR TCM
- âś” Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- âś” The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear.
- âś” The Check Engine Light or Transmission Warning Light is illuminated on the dashboard.
- âś” Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- âś” A noticeable decrease in fuel efficiency due to improper gear management.
- âś” Complete failure to shift up or down, or intermittent loss of communication with the module.
By replacing your old module with this precisely programmed unit, you’re not just fixing a symptom; you’re addressing the root cause of your transmission problems. This module is a direct replacement for a wide range of GM service numbers, including 24252114, 24234503, 24230461, and 24241806, ensuring broad compatibility and a perfect fit for your specific application. The installation is straightforward for a DIY mechanic, typically located in the engine compartment on the LH side. Simply disconnect the battery, swap the modules, reconnect, and clear any stored codes with a basic scan tool. Get your HHR back on the road and shifting like new with a reliable, pre-programmed 2006-2011 HHR TCM.
Frequently Asked Questions
What does a VIN-programmed TCM mean for my HHR?
VIN programming means we load the module with the specific software and calibrations for your exact vehicle using your car’s unique VIN. This makes the part plug-and-play, allowing it to communicate correctly with the engine and other systems without requiring a trip to the dealership for expensive programming.
Do I need to take my car to a mechanic after installing this part?
No. Because the module is pre-programmed to your VIN, no further programming is required. After installation, you may need to use a standard OBD2 scan tool to clear any old transmission codes stored in the vehicle’s computer, a process that takes only a few minutes.
Where is the TCM located on a 2006-2011 Chevrolet HHR?
On the 2006-2011 HHR, the Transmission Control Module is typically found in the engine compartment, mounted on the left-hand (driver’s side) of the engine compartment.
Will this module fix transmission error codes like P0700?
Yes, if the TCM itself is the faulty component. A code like P0700 is a general fault code indicating the TCM has detected a problem. Replacing a failed TCM will resolve this code and the underlying specific codes it has stored, such as those for shift solenoids or pressure switches that are actually functioning correctly.
Is there a core charge for this TCM?
No, there is no core charge for this part. You can keep your old module without the hassle of returning it, saving you time and money.