Restore Peak Performance and Reliability to Your GM Truck or Van
Is your truck suffering from puzzling issues like a persistent check engine light, erratic shifting, a rough idle, or even a no-start condition? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a failing PCM can cripple a perfectly good engine. This isn’t just an inconvenience; it affects your vehicle’s fuel economy, power, and emissions. This replacement 2005-2007 Sierra 2500 PCM is the definitive solution to restore your vehicle’s factory performance and operational integrity.
What sets this module apart is our professional, in-house programming service. Before we ship your part, we flash it with the latest official GM software updates, tailored specifically to your vehicle using the VIN you provide. This critical step eliminates the need for expensive dealership visits or specialized scan tools, making this a true plug-and-play fix for both seasoned mechanics and determined DIYers. You receive a module that is ready for installation right out of the box, saving you time, money, and frustration.
A Technician’s Notebook: The 8.1L That Wouldn’t Cooperate
I’ll never forget a 2006 Silverado 3500 with the big 8.1L gas engine that came into my bay. The owner was at his wit’s end. The truck had an intermittent stall, would sometimes refuse to start, and threw a P0601 (Internal Control Module Memory Check Sum Error) code that kept coming back no matter what. We checked wiring harnesses and grounds for hours. The issue was the original PCM’s internal processor was failing unpredictably. Swapping in a pre-programmed module like this one solved everything instantly. The truck ran smoother than it had in years, and the owner was back on the road in under an hour after the part arrived. It’s a classic failure mode for these workhorses.
Is Your Truck’s Brain Failing? Common Symptoms
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module may need replacement:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Stored diagnostic trouble codes (DTCs) like P0601, P0602, P0606, or U0100
- ✔ Engine stalling, stumbling, or hesitating during acceleration
- ✔ Rough or inconsistent idling
- ✔ Complete no-start or hard-starting condition
- ✔ Poor fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass state emissions testing
A Straightforward Guide to Installation
Installing your new 2005-2007 Sierra 2500 PCM is a manageable job for anyone with basic tools. For most trucks like the Sierra/Silverado, the module is located in the engine bay, on the driver’s side, under or near the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the PCM: On most GM trucks from this era, you’ll find the PCM mounted to a bracket near the battery and air filter box. On vans like the Express/Savana, it’s typically in the LH rear of the engine compartment.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Needed): In many cases, you may need to perform a simple security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. On the fourth try, the vehicle should start and run normally.
Will This Fit My Vehicle?
This module is a direct replacement for part numbers 89017749, 12589462, and 12602801 and fits a wide range of GM vehicles. Please verify your model and options below to ensure compatibility. This is a reliable solution for your 2005-2007 Sierra 2500 PCM needs and many others.
SILVERADO 1500 PICKUP 05-06 (LH front under battery), w/o hybrid; w/4.3L
SILVERADO 1500 PICKUP 07 classic style, (LH front under battery), w/o hybrid; w/4.3L
SILVERADO 2500 PICKUP 05-06 (LH front under battery), gasoline, 8.1L
SILVERADO 2500 PICKUP 07 classic style, (LH front under battery), gasoline, 8.1L
SILVERADO 3500 PICKUP 05-06 (LH front under battery), gasoline, 8.1L
SILVERADO 3500 PICKUP 07 classic style, (LH front under battery), gasoline, 8.1L
SIERRA 1500 PICKUP 05-06 (LH front under battery), w/o hybrid; w/4.3L
SIERRA 1500 PICKUP 07 classic style, (LH front under battery), w/o hybrid; w/4.3L
SIERRA 2500 PICKUP 05-06 (LH front under battery), gasoline, 8.1L
SIERRA 2500 PICKUP 07 classic style, (LH front under battery), gasoline, 8.1L
SIERRA 3500 PICKUP 05-06 (LH front under battery), gasoline, 8.1L
SIERRA 3500 PICKUP 07 classic style, (LH front under battery), gasoline, 8.1L
SUBURBAN 2500 05-06 (LH front under battery), 8.1L
AVALANCHE 2500 05-06 (LH front under battery)
YUKON XL 2500 05-06 (LH front under battery), 8.1L
SAVANA/EXPRESS 1500 VAN 05-07 (LH rear engine compartment)
SAVANA/EXPRESS 2500 VAN 05-07 (LH rear engine compartment), gasoline
SAVANA/EXPRESS 3500 VAN 05-07 (LH rear engine compartment), gasoline
ASTRO 05 (LH front by battery)
BLAZER S10/JIMMY S15 05 (RH front engine compartment)
CTS 04-05 (RH engine compartment), V-Series, ID 12589462 or 12602801
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship the module until we receive this information.
Is any additional programming required after installation?
No. We flash the module with the latest GM software using your VIN, so it arrives ready to install. In some cases, a simple 30-minute security relearn procedure (as outlined in the installation guide) may be necessary, which requires no special tools.
Does this part fit vehicles other than the Sierra 2500?
Yes, absolutely. This PCM is compatible with a wide array of GM trucks, vans, and SUVs from the mid-2000s. Please check the detailed compatibility list above to confirm it fits your specific model and engine.
What happens if I don’t replace a failing PCM?
Ignoring a failing PCM can lead to more severe problems, including catalytic converter damage from an incorrect air/fuel mixture, poor engine performance, terrible fuel mileage, and eventually a vehicle that won’t start at all.
Is this a reliable, long-term fix?
Yes. This is a quality-tested electronic control module, programmed with official software. It is designed to restore the original function and reliability of your vehicle’s engine management system for years to come.