Is Your Chevy HHR Shifting Erratically or Stuck in Gear?
If your 2006-2011 Chevrolet HHR is giving you transmission headachesโlike harsh bangs into gear, getting stuck in limp mode, or flashing a check engine lightโyou’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). Over my 20+ years in the garage, I’ve seen this exact issue hundreds of times. A customer’s 2009 HHR came in last week with these exact symptoms: it wouldn’t shift past 2nd gear and the dash was lit up. A quick scan showed a P0700 code, which is a general transmission fault request. The root cause? A faulty factory TCM. This isn’t just an inconvenience; it’s a problem that affects your vehicle’s drivability, safety, and fuel economy.
The solution is this direct-replacement T42 Transmission Control Module, part number 24235753. The most critical feature is that it arrives at your door pre-programmed to your HHR’s specific Vehicle Identification Number (VIN). This eliminates the need for expensive dealership programming, saving you time and hundreds of dollars. You get a part that’s ready for immediate, plug-and-play installation.
Common Symptoms of a Failing 2006-2011 HHR TCM
A bad TCM can manifest in several ways. If you’re experiencing any of the following, it’s time for a replacement:
- โ Harsh, delayed, or unpredictable gear shifts.
- โ Vehicle is stuck in a single gear (often called “limp mode”).
- โ Check Engine Light or Transmission Warning Light is illuminated.
- โ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- โ Complete loss of shifting capability or intermittent communication failure.
- โ A noticeable drop in fuel efficiency.
Expert Pro Tip: Check Your Connections First!
Before you replace the TCM, take 60 seconds to inspect the main electrical connector that plugs into the module. Over the years, moisture and road grime can cause corrosion on the pins, leading to poor communication that mimics a failed module. Unplug it, check for any green or white crust, and clean it with an electrical contact cleaner if necessary. This simple check can sometimes save you from replacing a part that isn’t actually bad.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new TCM is a straightforward job that most DIYers can complete in under 30 minutes with basic hand tools. For the Chevy HHR, the module is conveniently located in the left-hand (driver’s side) of the engine compartment.
- 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’s a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any stored transmission codes. Take a test drive to confirm smooth shifting has been restored.
This module is built to meet or exceed original equipment standards, ensuring long-lasting reliability and performance. It is a direct replacement for multiple part numbers, including 24235753, 24252114, 24234503, and others, making it the ideal solution for a wide range of GM vehicles beyond just the HHR. Restore the precise, smooth operation of your transmission today.