Restore Peak Performance to Your Vehicle’s Engine
Is your Pontiac G5, Chevy Cobalt, or Saturn Aura running poorly? Experiencing a persistent Check Engine Light, erratic shifting, or a frustrating no-start condition? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central brain of your vehicle’s engine and transmission. When it fails, it can cause a cascade of confusing and disruptive problems. This replacement PCM, compatible with service number 12612397 and others, is the definitive solution to get your car back on the road, running smoothly and reliably.
This isn’t just a part in a box. We provide a comprehensive service that eliminates the guesswork and costly trips to the dealership. Upon purchase, simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then program the module with the latest, most stable software updates directly from GM. This ensures that the computer is perfectly matched to your vehicle’s specific configuration, including engine, transmission, and emissions equipment. It arrives at your door ready for installation, saving you hundreds in programming fees.
From the Diagnostic Bay
We had a 2008 Chevy HHR come into the shop with classic signs of a bad computer: stalling at idle, a flashing check engine light, and a U0100 ‘Lost Communication with ECM/PCM’ code. The owner had already replaced the ignition module and spark plugs with no luck. Before condemning the expensive module, we performed a simple voltage drop test on the main power and ground wires to the PCM. We discovered a corroded ground connection on the engine block, barely visible under a wiring loom. After cleaning the connection point to bare metal, all symptoms disappeared. This highlights a critical point: always verify the PCM’s power and ground integrity before replacement. A 10-minute check can save you from replacing a perfectly good part.
Symptoms of a Failing Pontiac G5 PCM
A failing engine computer can manifest in numerous ways, from subtle annoyances to critical failures. If your vehicle is exhibiting any of the following issues, a faulty PCM could be the culprit:
- ✔ Check Engine Light: The light may be on constantly or illuminate intermittently. You may find communication error codes (U-codes) or multiple, unrelated sensor codes stored in memory.
- ✔ Engine Performance Problems: This includes rough idling, engine misfires, hesitation during acceleration, stalling, and a noticeable loss of power.
- ✔ Poor Fuel Economy: An incorrect air/fuel mixture commanded by a faulty PCM can lead to a sudden and significant drop in MPG.
- ✔ Transmission Shifting Issues: The PCM also controls transmission functions. You might experience harsh shifting, delayed engagement, or the transmission getting stuck in one gear (limp mode).
- ✔ Intermittent or No-Start Condition: The engine may crank but refuse to start, or it may start unreliably. This can be caused by the PCM failing to properly control the fuel injectors or ignition coils.
- ✔ Failed Emissions Test: A malfunctioning PCM can prevent the vehicle’s readiness monitors from setting, resulting in an automatic emissions failure.
The Plug-and-Program Solution
This module is a direct replacement for a wide range of GM vehicles, including the Pontiac G5, Chevy Malibu, Saturn Vue, and various Silverado/Sierra trucks. It is compatible with multiple service numbers, including 12612397, 12597125, 12611549, 12629019, and 12635902. By programming the unit to your VIN, we ensure it functions precisely as the original. The process is simple: place your order, send us your VIN, and we handle the complex programming. Once installed, you may need to perform a simple security relearn procedure (also known as a CASE relearn), which can typically be done without special tools and syncs the new module with your vehicle’s anti-theft system. This final step ensures seamless integration and full functionality.
Frequently Asked Questions
Will this PCM be plug-and-play for my vehicle?
Because we program it to your specific VIN before shipping, it is as close to plug-and-play as possible. It will have the correct software for your car’s engine, transmission, and options. However, on most GM vehicles, you will need to perform a security relearn procedure after installation to sync the new computer with your car’s anti-theft system. This procedure is straightforward and instructions can be easily found online or in a service manual.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on the vehicle itself. Look for a small metal plate on the driver’s side of the dashboard visible through the windshield, or on the sticker inside the driver’s door jamb.
Do I need to return my old PCM?
No core charge or return is required for this part. You can keep your old module or dispose of it responsibly.
What happens if I install it without doing the security relearn?
If the security relearn is not performed, the vehicle’s anti-theft system will likely prevent the engine from starting. You will typically see a security light flashing on the dashboard, and the engine will crank but not fire up.
Is this compatible with all 2007-2010 Pontiac G5 models?
Yes, this PCM is compatible with all 2007-2010 Pontiac G5 models, as well as a wide range of other GM vehicles listed in the fitment chart. Providing your VIN is the crucial step that allows us to load the exact software for your specific model and engine (e.g., 2.2L or 2.4L).