Is Your Silverado Running Rough? The PCM Might Be the Culprit.
If your 2005, 2006, or 2007 Chevrolet Silverado is experiencing baffling issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, the problem may lie with its central command center: the Powertrain Control Module (PCM). This module is the brain of your truck’s engine and transmission, and when it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep your reliable truck off the road. This direct-fit replacement PCM, part number 89017749, is the solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
We had a 2006 Sierra 1500 with the 4.3L V6 come into the shop. The owner had spent a small fortune replacing the throttle body, MAF sensor, and all four oxygen sensors trying to chase down a stubborn lean code (P0171) and a rough idle. The truck would run fine for a day, then the light would pop back on. After confirming the new parts were working and checking for vacuum leaks, we hooked up our scope to the PCM connectors. We found the PCM’s driver for the fuel injectors was providing an inconsistent signal, causing the lean condition. A new, properly programmed PCM fixed the issue instantly. It’s a classic case of treating the symptoms instead of the root cause, which is often the module itself.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel mileage.
- ✔ The engine cranks but refuses to start.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Right Solution for Your 2005-2007 Silverado PCM
Replacing the PCM on these trucks isn’t as simple as swapping the part. The module must be programmed with your truck’s specific Vehicle Identification Number (VIN) and the latest GM software updates to function correctly. Without this critical step, the vehicle will not start due to the anti-theft system (PassLock/PassKey), and you’ll have incorrect engine and transmission parameters. Our service eliminates the hassle and high cost of a dealership visit. We professionally program this module to your exact VIN before it ships. This ensures that when you receive the part, it’s ready for a straightforward installation, getting you back on the road quickly and affordably.
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It fits a wide variety of GM trucks and vans, including the Sierra, Savana, Express, Suburban, and more. Please verify your part number and consult the detailed fitment list to ensure compatibility with your specific vehicle and engine option.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will load the latest GM-certified software for your specific vehicle.
Where is the PCM located on my 2005-2007 Silverado?
On most Silverado, Sierra, and Suburban models of this era, the PCM is located on the driver’s side of the engine bay, under the battery and battery tray.
Will I need to perform any other procedures after installation?
In most cases, the installation is plug-and-play. However, some vehicles may require a security relearn procedure, which is a simple process that can be done without special tools and typically takes 10-30 minutes. Instructions are readily available online. A Crankshaft Variation (CASE) relearn may also be needed to clear a P1336 code, which requires a capable scan tool.
What information do you need from me?
We need your complete 17-digit VIN to program the module correctly. This ensures the PCM has the right software for your truck’s engine, transmission, and factory options.
Is this part compatible with other GM vehicles?
Yes, this PCM is used across a wide range of GM trucks and vans from approximately 2005 to 2007, including the Sierra, Express, Savana, Suburban, and Avalanche. Please check the detailed compatibility list on this page to confirm it fits your specific model and engine.