Restore Peak Performance to Your GM Truck or Van
Is your GMC Sierra, Chevy Silverado, or GM van running rough, shifting erratically, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. Don’t let a faulty module keep you off the road. This replacement PCM, part number 89017749, is the reliable, straightforward solution to get your vehicle operating like new again.
This isn’t just a generic part off the shelf. We take the guesswork and hassle out of the repair by pre-programming this module specifically for your vehicle. When you place your order, simply provide us with your Vehicle Identification Number (VIN). Our technicians will then flash the unit with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance right out of the box, saving you a costly trip to the dealership for programming.
We had a 2006 Silverado 2500 with the 8.1L come in that was driving the owner crazy. The truck had a random, intermittent misfire and would occasionally stall at idle. The owner had already replaced the spark plugs, wires, and even a couple of ignition coils, but the problem persisted. After hooking up our diagnostic scanner and monitoring live data, we noticed that the fuel trim and ignition timing commands from the PCM were erratic. Instead of chasing more phantom sensor issues, we swapped in a VIN-programmed PCM. The truck immediately idled smoothly, and the misfire was gone. It’s a classic case where the ‘brain’ itself was the issue, not the components it was controlling.
Diagnosing a Faulty 2005-2007 Sierra 1500 PCM
The PCM is a complex component, and its failure can manifest in numerous ways. If your truck is experiencing any of the following symptoms, a failing control module is a likely culprit. A faulty PCM can cause cascading issues, so addressing it promptly is key to preventing further damage to components like your catalytic converter or transmission.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The most common indicator, often with codes related to sensors, misfires, or communication errors (U-codes).
- ✔ Poor Fuel Economy: Incorrect fuel and air mixture calculations lead to wasted gas.
- ✔ Rough Idle or Stalling: The engine struggles to maintain a consistent RPM at a stop.
- ✔ Engine Misfires: The PCM may fail to properly control spark timing or fuel injection.
- ✔ Harsh or Failed Shifting: As the PCM also controls transmission functions, you may notice erratic shifting, or the transmission may go into ‘limp mode’.
- ✔ No-Start Condition: In cases of complete failure, the PCM may not activate the fuel pump or ignition system, preventing the engine from starting at all.
- ✔ Failed Emissions Test: A malfunctioning PCM will prevent the vehicle’s emissions systems from operating correctly.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for several original equipment part numbers, including 12589462, 12602801, and 89017749. It is designed to fit a wide range of GM vehicles, including the GMC Sierra, Savana, and Safari, as well as the Chevrolet Silverado, Express, Suburban, and more. For most models like the Sierra and Silverado, the PCM is located in the engine bay on the driver’s side, under the battery tray. Installation is typically straightforward:
- Disconnect the Battery: Always disconnect the negative battery terminal before working on any electronic components.
- Access the Module: You may need to remove the battery and its tray to access the PCM.
- Swap the Connectors: Carefully disconnect the wiring harnesses from the old module and connect them to your new, pre-programmed unit.
- Reassemble: Reinstall the battery tray and battery, then reconnect the negative terminal.
- Perform Relearn Procedure: After installation, a security relearn and a Crankshaft Variation (CASE) relearn may be necessary. This can often be done with a capable bi-directional scan tool or by following a specific vehicle procedure.
By ordering this pre-programmed 2005-2007 Sierra 1500 PCM, you are choosing a reliable and efficient path to resolving your vehicle’s performance issues. Restore the power, efficiency, and dependability you expect from your truck.
Frequently Asked Questions
Do I need to get this module programmed?
No. This module comes fully programmed to your vehicle’s specific VIN. We handle all the programming before it ships, so it’s ready for installation when you receive it.
Where is the PCM located on my 2006 Sierra 1500?
On most 2005-2007 Sierra and Silverado pickups, the PCM (or ECM) is located in the engine compartment on the driver’s side, underneath the battery and battery tray.
What is a CASE relearn and is it required?
A CASE (Crankshaft Angle Sensor Error) relearn synchronizes the PCM with the crankshaft position sensor. After replacing the PCM, this procedure is almost always required to prevent a P1336 trouble code and ensure accurate misfire detection. This must be performed with a compatible high-level scan tool.
How do I provide my VIN?
You can add your vehicle’s 17-digit VIN to the notes section during checkout. If you forget, we will contact you via email after your purchase to request it before we can program and ship your module.
Is this part compatible with part number 12589462?
Yes, this module is a direct, interchangeable replacement for part numbers 12589462, 12602801, and 89017749, covering a wide range of GM applications.
What tools are needed for the installation?
You will need basic hand tools like a socket set to remove the battery and its tray. The most important tool is a capable bi-directional scan tool to perform the required security and CASE relearn procedures after the physical installation is complete.