Restore Peak Performance to Your Vehicle
Is your Saab 9-7X, Chevy Trailblazer, or GMC Envoy suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine’s performance and efficiency. Don’t let a faulty computer keep you off the road. This replacement PCM is the reliable, straightforward solution to get your vehicle running like new again.
This unit is not just a part; it’s a complete service. We pre-program it specifically for your vehicle using your unique Vehicle Identification Number (VIN). This ensures that it has the correct factory calibration and the latest software updates from GM, addressing potential drivability issues and optimizing performance. By programming the module before shipping, we eliminate the need for an expensive trip to the dealership for programming, saving you time and money.
From the Diagnostic Bay
We once had a GMC Envoy with the 4.2L engine come into the shop that had its owner completely stumped. He had spent hundreds of dollars replacing the mass airflow sensor, spark plugs, and even an oxygen sensor trying to fix a random misfire and stalling issue. The codes were inconsistent. After connecting our professional scan tool, we noticed the PCM was slow to respond and the live data for the injector drivers was erratic. The root cause wasn’t a bad sensor, but a failing driver circuit inside the original PCM. We installed one of our VIN-programmed modules, performed the security relearn, and the truck ran perfectly. This is a common scenario where chasing symptoms costs more than addressing the core problem: a faulty engine computer.
Symptoms of a Failing SAAB 9-7X PCM
A failing PCM can manifest in various ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer may be the culprit:
- ✔ Persistent Check Engine Light (CEL) illumination, especially with communication-related fault codes (U-codes).
- ✔ Unexplained engine misfires or a rough, unstable idle.
- ✔ The engine cranks but refuses to start.
- ✔ A noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling for no apparent reason.
- ✔ Failure to pass an emissions test due to module-related errors.
A True Plug-and-Play Solution
This PCM is a direct-fit replacement for your original unit. The process is simple: place your order, provide us with your vehicle’s VIN, and we handle the complex programming. The module you receive will be ready for installation right out of the box. While the physical installation is straightforward for any DIY mechanic, please note that a security relearn procedure (often called a CASE relearn) may be required after installation. This is a simple procedure that pairs the new computer to your vehicle’s anti-theft system and can typically be done without special tools.
Guaranteed Compatibility
This module is engineered to work seamlessly with a wide range of GM SUVs equipped with the 4.2L inline-6 engine. It directly replaces the following part numbers:
12573576, 12574976, 12577955, 12584593, 16255757, 19210065
It is compatible with the following vehicles:
- 2005-2006 SAAB 9-7X (4.2L 6-Cylinder)
- 2003-2005 GMC ENVOY & ENVOY XL (4.2L)
- 2004-2005 GMC ENVOY XUV (4.2L)
- 2003-2005 CHEVROLET TRAILBLAZER & TRAILBLAZER EXT
- 2004-2005 BUICK RAINIER (4.2L)
- 2003-2004 OLDSMOBILE BRAVADA
- 2003-2005 ISUZU ASCENDER (4.2L)
Restore your vehicle’s reliability and drivability today. Order this VIN-programmed PCM and get back on the road with confidence.
Frequently Asked Questions
Do I need to have this computer programmed by a dealer?
No. This is the primary benefit of our service. We program the computer with the latest GM software using the VIN you provide during checkout. It will arrive at your door ready to be installed, saving you a costly trip to the dealership.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific vehicle. You can typically find it on a plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a simple plug-and-play installation?
For the most part, yes. The physical installation involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module to swap in the new one. However, after installation, you will likely need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure is often simple and can be done in your driveway.
Will this fix my check engine light?
If the check engine light is caused by a fault within the PCM itself, then yes, this part will resolve the issue. It is crucial to have your vehicle properly diagnosed to confirm that the PCM is the root cause of the problem before ordering.
My original part number isn’t 12577955. Will this still work?
Yes, this module is a compatible replacement for several part numbers, including 12573576, 12574976, 12584593, 16255757, and 19210065. As long as your vehicle make, model, year, and engine are on our compatibility list, this unit will function correctly once programmed to your VIN.