Restore Peak Performance to Your GM Truck or SUV
The Powertrain Control Module (PCM) is the central command center of your vehicle’s engine and transmission. It meticulously manages everything from fuel injection and ignition timing to transmission shift points and emissions controls. When the PCM begins to fail, it can cause a cascade of frustrating and often misdiagnosed problems, leaving your truck or SUV running poorly, or not at all. This replacement Powertrain Control Module, part number 12589463, is the definitive solution to restore your vehicle’s original performance, reliability, and efficiency.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We eliminate the need for expensive dealership visits or specialized tools by pre-programming the module specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our technicians will flash the unit with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal function right out of the box.
From the Diagnostic Bay
We had a 2005 Silverado 2500 come into the shop with a complaint of a persistent random misfire and harsh, unpredictable shifting, especially from 1st to 2nd gear. The owner had already replaced spark plugs, wires, and two coil packs with no improvement. The check engine light was on with codes for a cylinder 4 misfire and a generic transmission control error. Our initial diagnostics showed the coil and injector on cylinder 4 were receiving erratic signals. Instead of firing consistently, the signal from the PCM would drop out intermittently. We knew the components were good, so we focused on the source: the PCM itself. After installing a VIN-programmed module, we cleared the codes and took it for a test drive. The engine ran perfectly smooth, and the transmission shifted like it just rolled off the factory floor. The failing driver circuit inside the old PCM was the root cause of both issues, a common failure point we see on these modules.
Symptoms of a Failing 2003-2006 Yukon PCM
A faulty PCM can manifest in various ways. If you’re experiencing any of the following issues, a failing control module is a likely culprit:
- ✔ Check Engine Light: The most common symptom, often with communication-related codes (U-codes) or multiple, seemingly unrelated sensor codes.
- ✔ Engine Performance Problems: Includes rough idling, stalling, hesitation during acceleration, misfires, and a noticeable decrease in power.
- ✔ Poor Fuel Economy: If the PCM cannot correctly manage the air-fuel mixture, your vehicle’s gas mileage will suffer significantly.
- ✔ Transmission Shifting Issues: Hard shifting, delayed engagement into gear, or getting stuck in one gear (limp mode) are classic signs of PCM failure.
- ✔ Intermittent or No-Start Condition: The PCM controls the fuel pump and ignition coils. If it fails, it can prevent the engine from starting, even if the battery and starter are healthy.
- ✔ Failure to Pass Emissions Tests: An improperly functioning PCM cannot manage the vehicle’s emissions systems, leading to an automatic failure.
Plug-and-Play Installation Process
Because we program the module to your VIN before shipping, the physical installation is straightforward. After disconnecting the vehicle’s battery, you will locate and swap the old module with the new one. On most compatible models like the Yukon, Silverado, and Tahoe, the PCM is located in the engine bay, on the driver’s side, under or next to the battery tray. Once installed, you will need to perform a security relearn procedure (often called a Passlock or CASE relearn). This simple procedure syncs the new PCM with your vehicle’s anti-theft system and can typically be done in your driveway without any special tools. Instructions for this procedure are widely available online for your specific model.
This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Restore the reliability and driving pleasure of your GM vehicle today.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s VIN during or after checkout, and it will arrive ready for installation.
Where is the PCM located on my 2004 GMC Sierra?
On most GM trucks and SUVs from this era, including the Sierra, Silverado, Yukon, and Tahoe, the PCM is located in the engine compartment on the driver’s side, typically mounted to a bracket near the battery or air filter box.
What is a security relearn procedure?
A security relearn, or anti-theft relearn, is a required step that syncs the new PCM to your vehicle’s existing keys and security system. It usually involves a sequence of turning the key in the ignition. This procedure prevents the anti-theft system from disabling the vehicle.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the vehicle first, as the check engine light can be triggered by many other failing components.
Is this compatible with my 2005 Hummer H2?
Yes, this PCM is compatible with a wide range of GM vehicles, including the 2005 Hummer H2. Please review the full fitment list on this page to confirm compatibility with your specific year, make, and model.