Is Your GM Truck or SUV Running Rough? It Could Be the PCM.
If you’re dealing with a persistent Check Engine Light, erratic engine behavior, poor fuel mileage, or harsh transmission shifting in your 2003-2007 GM vehicle, the Powertrain Control Module (PCM) is a likely culprit. As the central computer for your engine and transmission, a failing PCM can cause a cascade of frustrating and difficult-to-diagnose issues. This replacement Powertrain Control Module, service number 89017750, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
The PCM is responsible for managing critical functions like fuel mixture, ignition timing, variable valve timing, and transmission shift points. It constantly analyzes data from dozens of sensors throughout your vehicle to make real-time adjustments. When internal components on the circuit board begin to fail due to heat, vibration, and age, these calculations become incorrect, leading to the symptoms you’re experiencing. Don’t let a faulty computer keep your powerful truck or SUV sidelined. This module is your direct path to a smooth-running vehicle.
From the Diagnostic Bay
We had a 2005 Sierra 2500 with the 6.0L V8 come in with a complaint of intermittent stalling at stoplights and a bizarrely harsh 1-2 shift that would sometimes slam into gear. The owner had already replaced the throttle body and a few sensors with no luck. There were no hard fault codes, just a few communication loss codes stored in history. After running a full diagnostic, we monitored the live data from the PCM and noticed the injector pulse width and ignition timing commands were fluctuating wildly at idle right before it would stall. This pointed directly to a processing failure within the module itself. We installed a VIN-programmed PCM just like this one, performed the security relearn, and the truck ran perfectly. The shifting smoothed out, the idle stabilized, and the stalling issue was completely gone. It’s a classic case of a failing PCM causing phantom issues that other parts get blamed for.
Symptoms of a Failing 2003-2007 Silverado 2500 PCM
A failing powertrain module can manifest in many ways. If your vehicle is exhibiting one or more of the following signs, it’s time to consider a replacement:
- ✔ Check Engine Light: The most common indicator, often with codes related to sensor circuits, communication errors (U-codes), or processor faults.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or rough running conditions.
- ✔ Erratic Shifting: The transmission may shift harshly, slip between gears, or get stuck in one gear (limp mode).
- ✔ Engine Stalling or No-Start: The engine may stall unexpectedly while driving or refuse to start at all, even with a good battery and starter.
- ✔ Reduced Fuel Economy: A faulty PCM can’t efficiently manage the engine’s fuel delivery, leading to a significant drop in MPG.
- ✔ Failed Emissions Test: Incorrect air/fuel mixture management will almost certainly cause your vehicle to fail a smog check.
The Plug-and-Play Solution: VIN Programmed for Your Vehicle
What sets this module apart is our professional programming service. When you purchase this PCM, you provide us with your vehicle’s 17-digit VIN. We then use that information to flash the module with the latest, most up-to-date software calibration directly from General Motors. This critical step ensures that the PCM is a perfect match for your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment. This eliminates any guesswork and prevents the compatibility issues that plague unprogrammed modules. Your new PCM will arrive ready for installation, saving you a costly trip to the dealership.
This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide array of GM trucks and SUVs from this era, including the Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Hummer H2, and more. Please verify the fitment list to ensure compatibility with your exact model and year.
Installation is straightforward for a DIY mechanic. The module is typically located in the engine bay on the driver’s side, near the battery or airbox. After disconnecting the battery, simply unplug the electrical connectors, unbolt the old unit, and install the new one. Once installed, you will need to perform a simple security relearn procedure (often called VATS or Passlock relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require any special tools.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send your original module to us. This is a direct purchase of a replacement unit.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot program and ship your module until we receive this information.
Is this PCM difficult to install?
Installation is relatively simple for those with basic mechanical skills. It involves disconnecting the battery, unplugging the connectors, and swapping the module. The most important step after installation is performing the security relearn procedure, which can be done at home without special tools. Instructions are widely available online for your specific vehicle.
Will this fix my check engine light?
If the check engine light and other symptoms are being caused by a faulty PCM, this replacement part will resolve those issues. However, it’s always recommended to have your vehicle properly diagnosed to ensure the PCM is the root cause and not a separate sensor or wiring problem.
What if my original part number isn’t listed?
This module replaces several common service numbers. If your number is not on the list (89017750, 12582605, 12589463, 12602802, 89017734, 28042802), please contact us with your VIN and we can verify compatibility for you.