Restore Peak Performance to Your Vehicle’s Engine
Is your Cadillac CTS, GM truck, or van suffering from perplexing issues like a persistent check engine light, poor fuel economy, stalling, or erratic shifting? These are common indicators of a failing Powertrain Control Module (PCM), the central computer responsible for managing your vehicle’s engine and transmission. This replacement PCM, part number 89017749, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. We take the guesswork and hassle out of the repair by pre-programming the module to your specific Vehicle Identification Number (VIN) with the latest GM factory software updates before it ships. This ensures a seamless installation process, getting you back on the road quickly and confidently.
From the Diagnostic Bay
We once had a 2005 Silverado 2500 with the 8.1L engine come in that was driving the owner crazy. He had replaced the throttle body, mass airflow sensor, and all eight spark plugs chasing a rough idle and intermittent stalling issue. The codes were all over the place. After hooking up our diagnostic scanner and monitoring live data, we noticed the PCM was commanding erratic fuel trims and ignition timing that didn’t match sensor inputs. The root cause wasn’t a bad sensor; it was a faulty PCM giving bad commands. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck ran like it just rolled off the assembly line. It’s a classic case of treating the disease, not just the symptoms.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ Complete no-start or intermittent starting problems.
- ✔ Failure to pass state emissions testing.
Why Choose Our 2004-2005 CTS Powertrain Control Module?
This isn’t just a part; it’s a complete service. When you order from us, you’re getting a fully tested electronic control module that is flashed specifically for your vehicle. Simply provide us with your VIN during or after checkout, and our technicians will load the correct, updated software for your exact make, model, and options. This process eliminates the need for expensive programming tools or a costly trip to the dealership. While the module arrives ready to install, most GM vehicles of this era will require a simple security relearn procedure (also known as a key relearn or anti-theft relearn) after installation. This procedure pairs the new module to your vehicle’s anti-theft system and can typically be done in your driveway in about 30 minutes without any special tools.
Broad GM Compatibility
While this is a perfect fit for the 2004-2005 Cadillac CTS V-Series, this versatile module, also known by part numbers 12589462 and 12602801, is the correct computer for a wide range of GM trucks and vans. This includes popular models like the Silverado, Sierra, Express, Savana, Suburban, and more, particularly those equipped with the 4.3L V6 or 8.1L V8 engines. Please verify your original part number and consult the detailed fitment list to ensure compatibility with your specific vehicle.
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle all the programming for you before we ship the part. Just provide us with your vehicle’s 17-digit VIN, and we will flash the module with the latest GM software for your specific vehicle.
How do I provide my VIN?
You can add your VIN to the notes section during checkout or send it to us in a message after you complete your purchase. We cannot ship your order until we receive the VIN.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. It usually involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this sequence three times. Instructions are readily available online for your specific model.
Is this a plug-and-play part?
Yes, after our VIN programming, the module is ready to be installed. You will just need to perform the security relearn procedure after installation to start the vehicle.
How can I be sure this will fix my vehicle?
A faulty PCM can cause a wide range of issues. While this part is the correct solution for a confirmed PCM failure, we always recommend a proper diagnosis by a qualified mechanic to ensure you are replacing the correct component.
Where is the PCM located on a 2004-2005 CTS?
On the 2004-2005 Cadillac CTS, the Electronic Control Module (PCM) is typically located in the engine compartment on the right-hand (passenger) side.