Restore Smooth, Reliable Shifting to Your Chevrolet HHR
Is your 2006-2011 Chevy HHR struggling with harsh shifts, getting stuck in gear, or throwing transmission-related check engine lights? As a technician with over two decades of experience, I’ve seen these symptoms countless times. The culprit is often a failing Transmission Control Module (TCM). This crucial component is the brain of your automatic transmission, and when it malfunctions, it can make your vehicle feel unpredictable and unsafe. This replacement T42 TCM, part number 24255280, is the definitive solution to get your HHR driving like new again.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We pre-program the module to your vehicle’s specific VIN before shipping. This means you can skip the expensive trip to the dealership for programming. For a DIY mechanic, this saves hundreds of dollars and hours of hassle. For a professional shop, it means a faster, more profitable repair and a happier customer. This is the exact fix I’d use in my own bay to solve issues stemming from a faulty 2006-2011 HHR Transmission Module.
Case Study: A Tricky Diagnosis
A customer brought in their 2009 HHR with a frustratingly intermittent problem. It would occasionally refuse to shift out of 2nd gear (limp mode) and throw a generic P0700 transmission fault code. After checking the fluid and wiring, everything seemed fine. The issue would disappear after a restart, only to return days later. This is a classic sign of electronic failure inside the TCM. Heat cycles in the engine bay cause internal solder joints to crack over time. We installed one of our VIN-programmed modules, and the problem was solved permanently. The customer was back on the road with a reliable vehicle, avoiding a much costlier transmission replacement.
Is Your HHR Showing These Transmission Warning Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode” and won’t shift past 2nd or 3rd gear.
- ✔ Check Engine Light is on with codes like P0700, P0750, P0755, or other solenoid-related faults.
- ✔ Inconsistent or no response when shifting from Park to Drive or Reverse.
- ✔ A sudden drop in fuel economy or a transmission overheating warning.
- ✔ Complete loss of communication with the transmission module (no gear indicator on the dash).
Your Straightforward 30-Minute Installation Guide
Installing your new 2006-2011 HHR Transmission Module is a simple process that most DIYers can handle with basic tools. For the HHR, the module is conveniently located in the left-hand (driver’s side) engine compartment, making access easy.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Old TCM: Find the module on the driver’s side of the engine bay. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the wiring harnesses. 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 plug in the wiring harnesses, ensuring they click and lock into position.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored fault codes. Take the vehicle for a test drive to confirm smooth shifting.
Verified Fitment For Your Vehicle
This T42 Transmission Control Module is a guaranteed fit for the 2006-2011 HHR Transmission Module and is also a direct replacement for a wide range of other General Motors vehicles. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24256960, and more. Please verify your vehicle in the list below or contact our expert support team to confirm compatibility.
Frequently Asked Questions
What does “VIN Programmed” actually mean for me?
It means the module arrives at your door fully programmed with your vehicle’s specific software from GM. You can install it right out of the box without needing any special scan tools or a trip to the dealer for programming, saving you significant time and money.
Do I need to send my old part back (core charge)?
No, there is absolutely no core charge or need to return your old module. This makes the process faster and more convenient for you.
Will this fix my specific transmission problem?
This module is the direct solution for failures within the TCM itself, which cause the symptoms listed above. If your vehicle’s issues are caused by internal mechanical transmission failure (like a bad clutch pack), this part will not resolve it. Proper diagnosis is key.
Are any special tools required for installation?
No special tools are needed. A basic socket set to remove the mounting bolts and a flathead screwdriver to help release the connector tabs are typically all that’s required for the job.
What should I do after installing the new module?
After reconnecting the battery, start the vehicle and let it run for a moment. It’s recommended to clear any old codes with a scan tool and then perform a test drive to allow the transmission to complete its relearn process and confirm the repair.