Is Your Saturn Sky Running Rough or Throwing Confusing Codes?
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central command center of your 2008-2010 Saturn Sky. It’s responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a cascade of frustrating and often difficult-to-diagnose problems, leaving your sporty roadster feeling sluggish, unreliable, or even completely inoperable.
From the Diagnostic Bay
We once had a 2009 Saturn Sky come in with what the owner was convinced was a failing transmission. It was shifting hard, hesitating between gears, and occasionally throwing a communication error code. They had already spent a small fortune at a transmission shop that couldn’t find a mechanical fault. After hooking up our diagnostic tools, we noticed erratic data coming from the PCM. The module was sending corrupt signals to the transmission control module, causing all the symptoms. A new, properly programmed PCM, like this one, had the car shifting smoothly and running perfectly in under an hour. It’s a classic case of the ‘brain’ causing issues that appear to be mechanical.
Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light is illuminated with various, sometimes unrelated, trouble codes.
- ✔ Noticeable decrease in fuel economy.
- ✔ Engine stalling, misfiring, or running rough at idle.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Cooling fans running constantly or not turning on at all.
The Direct-Fit Solution: A Programmed 2008-2010 Sky PCM
Don’t let a faulty computer keep you off the road. This Powertrain Control Module, service number 12635902, is the definitive solution for a wide range of GM vehicles, including your 2008-2010 Saturn Sky. We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store or a salvage yard unit with unknown history, this PCM is prepared specifically for your vehicle. Upon purchase, you simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash the module with the latest, most stable GM-certified software calibration for your exact car. This ensures seamless integration, optimal performance, and correct communication with all other vehicle modules right out of the box.
This module is a direct replacement for several service numbers, including 12597125, 12612397, 12594750, 12629019, and 12611549, guaranteeing a perfect fit and function. By installing a correctly programmed module, you restore the precise engine management your vehicle had when it left the factory, fixing those persistent issues and bringing back the responsive driving experience you expect from your Sky.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. We program the module to your vehicle’s specific VIN before shipping. However, on many GM vehicles, you may need to perform a simple security relearn procedure (also known as a CASE relearn or anti-theft relearn). This can typically be done without special tools and involves a sequence of key turns. Instructions are readily available online or in service manuals.
How do I provide my VIN number?
After you complete your purchase, you can send us your 17-digit VIN through the order notes, a follow-up email, or by replying to your order confirmation. We cannot ship the part until we have your VIN to ensure correct programming.
Is this a brand new part?
This is a high-quality, tested, and verified genuine GM part. Each unit is inspected and programmed by our expert technicians to ensure it meets or exceeds original equipment specifications for performance and reliability.
Will this fix my specific problem?
A failing PCM can cause a wide variety of symptoms. This part is designed to correct issues directly caused by a faulty module. While it resolves the most common electronic problems, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the root cause of your issue before purchasing.
What if my original part number isn’t listed?
The part number 12635902 and the others listed (like 12597125, 12612397, etc.) are service numbers that supersede many original part numbers. As long as your vehicle—make, model, year, and engine—is on the compatibility list, this module will be the correct, programmed replacement for your car.