Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Malibu, Cobalt, HHR, or other GM vehicle suffering from erratic behavior, poor fuel economy, or a persistent Check Engine Light? The Powertrain Control Module (PCM), often called the Electronic Control Module (ECM), is the central computer responsible for managing your engine’s performance, emissions, and transmission shifting. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. This replacement PCM, compatible with service number 12635902 and others, is the definitive solution to get your vehicle running reliably again.
From the Diagnostic Bay
We had a 2011 Chevy Malibu come in with a complaint of intermittent stalling and a harsh 1-2 shift. The owner had already replaced the throttle body and a couple of sensors with no luck. After hooking up our diagnostic tools, we noticed erratic data streams coming from the PCM. Instead of continuing to replace parts, we identified the root cause: an internal fault in the original module. We installed a VIN-programmed PCM just like this one, performed a quick security relearn, and the car drove like it just left the factory. It saved the customer hundreds in unnecessary parts and labor.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The most common indicator, often with communication-related trouble codes (U-codes) or multiple, unrelated sensor codes.
- ✔ No-Start or Hard Starting: The engine may crank but fail to start, or take an unusually long time to fire up.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and rough idling are classic signs.
- ✔ Reduced Fuel Economy: A faulty PCM can’t properly manage the air-fuel mixture, leading to more trips to the gas station.
- ✔ Erratic Transmission Shifting: The PCM also controls modern automatic transmissions, so failure can result in harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Intermittent Stalling: The vehicle may stall unexpectedly while driving or when coming to a stop.
Your Plug-and-Play 2007-2012 Malibu PCM Solution
Don’t waste time and money at the dealership. We take the guesswork out of the repair process. When you order this module, we flash it with the latest official GM software update specifically for your vehicle’s Vehicle Identification Number (VIN). This ensures that all parameters for your engine, transmission, and options are perfectly matched. The module arrives at your door ready for installation, eliminating the need for expensive and specialized programming tools. While a simple security relearn procedure may be required after installation, this can typically be done in your own driveway without any special equipment.
This module is a direct replacement for a wide array of GM vehicles and is interchangeable with the following service numbers: 12612397, DL216140, 12594750, 12597125, 12629019, 12635902, and 12611549. Please verify your part number or consult the extensive fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. The main benefit of our service is that we program the module for you before it ships. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash it with the correct, updated software for your specific car or truck.
What tools are needed for installation?
Installation typically requires basic hand tools, such as a socket set and screwdrivers, to access and remove the old module and install the new one. The most important step is to disconnect the vehicle’s battery before starting the job to prevent any electrical damage.
Will I need to perform any other procedures after installation?
In most cases, you will need to perform a security relearn procedure, also known as an anti-theft relearn. This syncs the new PCM with your vehicle’s keys and security system. It’s a simple process that usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Specific instructions for your vehicle can be easily found online.
Where is the PCM located on my vehicle?
The location varies by model. On many vehicles like the Chevy Cobalt and Pontiac G6, it’s in the front-left (driver’s side) of the engine compartment. On trucks like the Silverado and Sierra, it’s often found under the battery tray. For vans and the HHR, it’s frequently in the rear of the engine compartment. Always consult a repair guide for your specific model to confirm the location.
How do I find my original part number?
The part number, often called the Service Number, is printed on a sticker on the case of your existing PCM. You will need to locate and visually inspect the module to get this number. Matching it to our list of compatible numbers ensures you are ordering the correct hardware.