Restore Your Vehicle’s Brain and Bring Back That Smooth, Reliable Drive
Is a persistent Check Engine Light dimming your driving enjoyment? Are you battling frustrating issues like rough idling, poor fuel economy, or a vehicle that simply won’t start? These are classic signs that your car’s central command center, the Powertrain Control Module (PCM), is failing. Don’t let a faulty computer dictate your day. This genuine GM engine control module, service number 12635902, is the definitive solution to get you back on the road with confidence. We take the guesswork out of the repair by pre-programming it with the latest GM software, tailored specifically to your vehicle’s VIN. It’s not just a part; it’s a renewed sense of trust in your ride.
Warning Signs and How to Overcome Them
A failing PCM can manifest in confusing ways. Here’s what to look for and the benefits you’ll experience with this replacement:
- ✔ Eliminate False Check Engine Lights: Puts an end to persistent and incorrect trouble codes, especially critical internal processor faults like P0601, P0606, or P062B.
- ✔ Restore Lost Power & Acceleration: Regain that crisp throttle response and smooth power delivery you’ve been missing.
- ✔ Solve No-Start or Stalling Conditions: Fixes intermittent starting problems and unexpected stalling, giving you the peace of mind that your car will start every time.
- ✔ Improve Fuel Efficiency: A properly functioning computer ensures the optimal air-fuel mixture, helping you save money at the pump.
- ✔ Smooth Out Rough Idling & Shifting: Corrects erratic engine behavior and harsh transmission shifts by restoring proper communication between components.
- ✔ Pass Emissions Testing: Ensures all engine parameters are within factory spec, a crucial step for passing state inspections.
An Expert’s Diagnostic Tale
“A customer brought in a 2009 Malibu with an issue that had stumped two other shops. It would run perfectly for days, then suddenly lose power and throw a dozen random communication codes. We checked wiring, sensors, and grounds for hours. Everything seemed fine. On a hunch, I tapped the PCM casing with a screwdriver handle while the engine was running, and it immediately stalled. The culprit was a hairline fracture on the circuit board, invisible to the naked eye, causing an intermittent short. Replacing the module with a properly programmed unit like this one solved the problem instantly. It’s a reminder that sometimes, the ‘brain’ is the source of the phantom pains.”
Guided Installation to Restore Peace of Mind
Replacing your Cobalt Engine Computer is a straightforward job you can tackle with basic tools. Follow these steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to allow all systems to discharge fully.
- Locate the Old Module: On most compatible vehicles, the PCM is found in the engine bay, often near the battery, firewall, or air filter box.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed PCM securely in place. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal and tighten it.
- Perform Security Relearn: Your vehicle’s anti-theft system may need to be relearned to the new PCM. This typically involves a simple procedure of turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your owner’s manual for the specific procedure for your model.
Tailored Fit for Your Ride
This module is a direct replacement for service numbers 12597125, 12612397, 12594750, 12629019, 12635902, and 12611549. It is guaranteed to fit and function correctly on the following vehicles and engine configurations:
- Buick Lucerne: 2009-2011 (3.9L)
- Chevrolet Cobalt: 2007-2010 (2.2L, 2.4L)
- Chevrolet HHR: 2007-2011 (2.2L, 2.4L)
- Chevrolet Impala: 2010-2011
- Chevrolet Malibu: 2007-2012 (2.2L, 2.4L, 3.5L)
- Chevrolet Express/GMC Savana 1500: 2008-2009 (4.3L)
- Chevrolet Silverado/GMC Sierra 1500: 2007-2009 (4.3L)
- Pontiac G5/G6: 2007-2010 (2.2L, 2.4L)
- Pontiac Solstice: 2008-2010 (2.4L)
- Saturn Aura: 2008-2009 (2.4L)
- Saturn Sky: 2008-2010 (2.4L)
- Saturn Vue: 2008-2010 (2.4L)
Important: After purchasing, please provide your VIN. This is essential for us to program the module correctly for your specific vehicle before shipping.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before the module is shipped. It will arrive flashed with the latest GM software specific to your vehicle’s VIN, making it ready for installation right out of the box.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory software, calibration files, and security information for your car. This ensures perfect compatibility and function, just like the original part.
Will this fix my specific problem?
This module is a direct solution for issues caused by a failing PCM, such as internal processor faults (P0601), communication errors, and erratic engine behavior. While it solves many common problems, we always recommend a proper diagnosis by a qualified technician to confirm the PCM is the root cause.
What is a security relearn procedure?
The security relearn, or anti-theft relearn, syncs the new PCM with your vehicle’s existing keys and security system. It’s a simple process you can usually do yourself in about 30 minutes with just your car key. We can provide instructions if needed.
Is a Crankshaft Variation (CASE) Relearn required?
In many cases, a CASE relearn may be necessary after installation to prevent a P0315 trouble code. This procedure calibrates the new PCM to the specific variations of your crankshaft position sensor and can be performed with a compatible high-end scan tool.