Is Your GM Truck or SUV Running Rough?
If you’re dealing with a frustrating no-start condition, intermittent stalling, erratic shifting, or a persistent Check Engine Light on your 2003-2007 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical for performance, fuel economy, and reliability. When it starts to fail, it can create a cascade of problems that are difficult to diagnose. Don’t let a faulty computer keep your workhorse off the road.
The Direct Solution: A VIN-Programmed PCM
This is a direct-fit replacement PCM, service number 12582605, for a massive range of GM trucks and SUVs. The biggest advantage we offer is our professional programming service. Before we ship it, we flash the module with the latest GM-certified software using the specific Vehicle Identification Number (VIN) from your truck. This ensures that it communicates perfectly with your vehicle’s specific options and systems, right out of the box. You get a reliable part that’s ready for installation, saving you a costly trip to the dealership for programming.
Expert Pro Tip: Protect Your New Module
From my 20+ years in the bay, I’ve seen hundreds of these PCMs fail prematurely due to a simple, overlooked issue: moisture. They are typically located under the battery tray on the driver’s side. Before installing your new PCM, take a moment to inspect the battery tray for cracks and the area below it for any signs of acid leaks or corrosion. A leaking battery is the number one killer of these modules. Cleaning the area and ensuring the battery is secure can prevent you from having to do this job twice.
Is a Failing PCM Causing These Symptoms?
A faulty engine computer can manifest in numerous ways. If you’re experiencing any of the following, this module is your likely solution:
- โ Unexplained Check Engine Light (CEL)
- โ Engine cranks but refuses to start
- โ Intermittent stalling, especially when warm
- โ Harsh or incorrect automatic transmission shifting
- โ Noticeable drop in fuel mileage
- โ Communication errors with diagnostic scan tools
- โ False sensor codes being stored
Simple, Plug-and-Play Installation
You can get your truck back to peak condition without a dealership visit. While professional installation is always recommended, this is a straightforward job for a confident DIYer.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most models like the Sierra, Silverado, and Tahoe, it’s found on the driver’s side of the engine bay, under the battery tray or near the airbox.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed module, reconnect the electrical harnesses until they click securely, and re-attach the battery terminal.
- Security Relearn: In most cases, you will need to perform a simple security relearn procedure which takes about 30 minutes. This can be done without any special tools and instructions are readily available online.
Guaranteed Fitment for Your 2003-2007 Sierra 3500 PCM
This module, part number 12582605, is a direct replacement for several service numbers including 89017750, 12589463, 12602802, 89017734, and 28042802. It fits a wide array of vehicles beyond the Sierra 3500, including the Escalade, Avalanche, Suburban, Yukon, and Hummer H2. Please verify your vehicle in the compatibility list and provide your VIN upon checkout to ensure a perfect, hassle-free installation. Restore your vehicle’s performance and reliability today.