Is Your GM Truck or SUV Running Rough?
If your 2003-2007 GM vehicle is suffering from mysterious engine problems, erratic transmission shifting, or a persistent check engine light that won’t go away, the root cause might be its electronic brain: the Powertrain Control Module (PCM). As the central command center for your engine and transmission, a failing PCM can create a cascade of frustrating and difficult-to-diagnose issues. This replacement Programmed GM PCM, part number 89017750, is the definitive solution to restore your vehicle’s performance, reliability, and drivability.
I once had a 2005 Silverado 2500 in the shop that was driving its owner crazy. It had a rough idle and would occasionally stall at stoplights. He had already replaced the spark plugs, ignition coils, and even the mass airflow sensor, but the problem persisted. After hooking up our diagnostic scanner, we noticed erratic data signals coming from multiple sensors simultaneously. This is a classic sign that the central processor is the problem, not the individual components. We installed a VIN-programmed PCM, performed the security relearn, and the truck ran like it just rolled off the factory floor. It’s a powerful reminder that sometimes the issue lies with the component that reads the sensors, not the sensors themselves.
Symptoms of a Failing GM PCM
A faulty PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- ✔ Check Engine Light: The light is on, and you may have codes related to multiple, unrelated sensors or communication errors (U-codes).
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, and decreased fuel economy.
- ✔ Rough or Stalling Idle: The engine idles erratically or stalls unexpectedly when stopped.
- ✔ Hard Starting or No-Start Condition: The engine cranks but refuses to start, or starts only after multiple attempts.
- ✔ Erratic Transmission Shifting: Harsh shifts, delayed engagement, or getting stuck in one gear (limp mode).
- ✔ Communication Issues: Your OBD-II scanner cannot communicate with the module.
The Simple, Reliable Solution: A VIN-Programmed Module
Don’t waste time and money at a dealership for expensive programming and diagnostics. We make the process simple. This PCM is a direct-fit replacement for a wide range of popular GM trucks and SUVs, including the Silverado, Sierra, Tahoe, Suburban, Escalade, and Hummer H2. The key benefit is our professional programming service. When you place your order, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians then flash the module with the latest, most stable GM-certified software specific to your exact vehicle configuration. This ensures perfect compatibility and optimal performance right out of the box.
This module is a direct replacement for several service numbers, including: 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802.
Installation and Setup
Replacing the PCM is a straightforward process for a DIY mechanic or any professional technician. On most of these GM trucks and SUVs, the module is located in the engine bay, on the driver’s side, often under or next to the battery tray. After physically swapping the module, you will need to perform a security relearn procedure, often called a “CASE Relearn” or “Anti-Theft Relearn.” This procedure syncs the new PCM with your vehicle’s anti-theft system and crankshaft position sensor. This can typically be done without special tools and involves a series of key cycles. Instructions are widely available online for your specific model, or your mechanic can perform it in minutes.
By ordering this Programmed GM PCM, you are getting a reliable, fully functional component that eliminates the guesswork and restores your vehicle to its factory operating condition. Get your truck back on the road with confidence.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. This PCM comes pre-programmed to your vehicle’s specific VIN. Simply provide your VIN to us after purchase, and we will flash the unit with the correct GM software before shipping it to you.
Where is the PCM located on my 2004 Silverado?
On most 2003-2007 GM full-size trucks and SUVs, the PCM (or ECM) is located in the engine compartment on the driver’s side, typically mounted near the battery and fuse box.
What is a CASE relearn and is it required?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that syncs the new PCM with your engine’s crankshaft position sensor for accurate timing. While the vehicle may run without it, performing the relearn is highly recommended to prevent a check engine light and ensure optimal engine performance. A security relearn is also necessary to sync the module with your keys.
How do I send you my VIN?
After you complete your purchase, you will receive instructions on how to reply with your 17-digit VIN. We cannot program and ship the module without it.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If your shifting issues are caused by faulty electronic commands from a failing module, this replacement part is the correct solution.