Is Your Chevrolet Impala Experiencing Engine Problems?
If your 2010 or 2011 Chevrolet Impala is suffering from erratic behavior like stalling, poor fuel economy, shifting issues, or a persistent Check Engine Light, the root cause is often a failing Powertrain Control Module (PCM). The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can create a cascade of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep your reliable Impala off the road. This direct replacement PCM, part number 12635902, is the definitive solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
We had a 2011 Impala come into the shop with a complaint of random stalling and a check engine light that multiple other shops couldn’t solve. They had replaced the spark plugs, a coil pack, and even the mass airflow sensor, but the problem persisted. After hooking up our professional scan tool, we noticed erratic data from the PCM and communication dropouts. Instead of throwing more parts at it, we identified the PCM as the core issue. After installing a VIN-programmed module just like this one and performing a quick security relearn, the car ran perfectly. The customer was thrilled to finally have a reliable car again, proving that correctly diagnosing the ‘brain’ is often the key.
Symptoms of a Failing 2010-2011 Impala PCM
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following issues, it’s a strong indicator that your engine computer needs attention. Verifying these symptoms can save you time and money on unnecessary repairs.
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication errors (U-codes), sensor circuits, or processor faults.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or rough idling.
- ✔ Reduced Fuel Economy: The engine may run too rich or too lean, causing a sudden and significant drop in your MPG.
- ✔ Engine Stalling or No-Start: The vehicle may stall intermittently while driving or fail to start altogether, even with a good battery and starter.
- ✔ Harsh or Incorrect Shifting: The PCM also controls the transmission, and a fault can lead to delayed, hard, or erratic gear changes.
- ✔ Communication Issues: A mechanic’s scan tool may be unable to communicate with the PCM, a definitive sign of an internal failure.
The Plug-and-Play Solution for Your Vehicle
This isn’t just a part in a box; it’s a complete service designed to get you back on the road quickly. We take the guesswork out of the repair by pre-programming this module specifically for your vehicle using the VIN you provide. This ensures that all factory settings, software, and calibrations match your Impala’s exact configuration. This module is a direct replacement for a wide range of service numbers, including 12597125, 12612397, 12629019, and 12635902, guaranteeing broad compatibility.
Upon installation, the only additional step required is a simple security relearn procedure (also known as a key relearn). This process syncs the new PCM with your vehicle’s anti-theft system and can typically be done in your driveway in about 30 minutes with just your key. No expensive dealer tools are required. By providing your VIN at checkout, you ensure a module that is ready for installation, saving you hundreds of dollars in dealership programming fees.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of the engine and transmission to ensure optimal performance, fuel efficiency, and emissions. It’s the brain of your car’s powertrain.
Is this module ready to install when I receive it?
Yes! We flash the module with the latest GM software updates and program it to your vehicle’s specific VIN before shipping. This makes the installation process as simple as possible.
Where do I provide my VIN?
You can provide your Vehicle Identification Number (VIN) during the checkout process or send it to us in a message after your purchase. We cannot ship the module until we have your VIN to program it.
Do I need to do anything after installing the new PCM?
After the physical installation, you will need to perform a security relearn procedure. This is a simple process that takes about 30 minutes and involves turning the key in the ignition in a specific sequence. Instructions are readily available online or we can assist you.
Does this part fit other vehicles besides the Impala?
Yes, this hardware (service number 12635902 and its equivalents) is used in a wide variety of GM vehicles like the Malibu, Cobalt, HHR, and Silverado. However, the programming we provide will be specific to the 2010-2011 Impala based on the VIN you give us.