Restore Your Impala’s Performance and Reliability
Is your Chevrolet Impala suffering from frustrating and unpredictable issues like a persistent Check Engine Light, rough idling, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. Don’t let a faulty computer compromise your car’s safety and performance. This replacement PCM, part number 12635902, is the definitive solution to get your Impala running smoothly and dependably once again.
We take the complexity out of the repair. Before this module ships, we program it specifically to your car’s Vehicle Identification Number (VIN) with the latest, most stable software updates from GM. This means it arrives ready for a straightforward installation, often without needing an expensive trip to the dealership. Regain that worry-free drive and the confidence that your car will start and run as it should, every single time.
Warning Signs and How to Overcome Them
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is your solution:
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0601, P0606, or U0100 (Loss of Communication).
- ✔ Unexplained drops in fuel mileage.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ Failure to pass state emissions testing.
Guided Installation to Restore Peace of Mind
Installing your new 2010-2011 Impala PCM is a manageable task for a confident DIYer. Follow these steps for a successful replacement.
- Safety First: Always begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Module: On your Impala, the PCM is typically found attached to the lower part of the air cleaner box assembly in the engine bay.
- Disconnect Wiring: Carefully unplug the electrical harness connectors from the old PCM. These connectors have locking tabs that need to be released before they can be pulled away. Never force them.
- Remove the Old PCM: Unbolt the old module from its mounting bracket. Keep the hardware safe as you will need it for the new unit.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect and Secure: Plug the wiring harnesses firmly into the new module until they click into place, ensuring a solid connection. Reconnect the negative battery terminal.
- Final Steps: In many cases, the vehicle will start and run perfectly. However, some GM vehicles may require a simple security relearn procedure (often called a ‘key cycle’) to sync the new PCM with the anti-theft system. This can typically be done without special tools.
Tailored Fit for Your Ride
This module is a direct replacement for service number 12635902 and is also compatible with 12597125, 12612397, 126140, 12594750, 12629019, and 12611549. It fits a wide range of GM vehicles. Please verify your model and engine below:
COBALT 07-08 2.2L | 08 2.4L | 09 2.2L | 10 2.2L
EXPRESS 1500 VAN 08-09 4.3L
G5 07 2.2L | 08-10
G6 08-09 2.4L | 10
HHR 07-11 2.2L | 08-11 2.4L
IMPALA 10-11 (lower part of air cleaner box)
LUCERNE 09-11 3.9L
MALIBU 07 2.2L | 08 Classic 2.2L | 08 New Style 2.4L | 09-10 2.4L | 10 3.5L | 11-12 2.4L
SAVANA 1500 VAN 08-09 4.3L
SIERRA 1500 PICKUP 07-09 4.3L
SILVERADO 1500 PICKUP 07-09 4.3L
SKY 08-10 2.4L
SOLSTICE 08-10 2.4L
VUE 08-10 2.4L
Frequently Asked Questions
What information do you need from me after I order?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. We use this to load the correct, updated GM software for your specific car, ensuring compatibility and proper function.
Is any additional programming required after installation?
No dealership programming is needed. Because we program the module to your VIN before shipping, it is ready to install. Some vehicles may require a simple security relearn procedure, which involves a series of key turns and can be done in your driveway without any special tools.
Will this fix my specific problem?
This replacement 2010-2011 Impala PCM will resolve issues directly caused by a faulty module. While the symptoms listed are common indicators of PCM failure, we always recommend a proper diagnosis by a qualified mechanic to rule out other potential causes like bad sensors or wiring problems.
What does ‘PCM’ stand for?
PCM stands for Powertrain Control Module. It is the main computer in your vehicle that controls all aspects of the engine’s performance, fuel delivery, ignition timing, and transmission shifting to ensure optimal power, efficiency, and low emissions.
Is this a used part?
This is a genuine, road-tested OEM component that has been thoroughly inspected and verified for full functionality. It is then programmed with the latest software for your vehicle, offering a reliable and cost-effective alternative to a brand-new unit from a dealer.