Restore Peak Performance to Your GM Vehicle
Is your Chevrolet Express, GMC Savana, or Silverado suffering from baffling electrical issues, poor engine performance, or erratic shifting? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer responsible for managing your vehicle’s engine and transmission. When it fails, it can lead to a host of frustrating problems that can sideline your work van or truck. This replacement PCM, part number 89017749, is the definitive solution to get your vehicle back on the road and running reliably.
From the Diagnostic Bay
We had a 2006 Savana 2500 work van come into the shop with a complaint of intermittent stalling and a persistent Check Engine Light. The owner had already replaced the fuel pump and several sensors with no luck. Our scan tool showed communication loss codes with the PCM. After verifying the wiring and connectors were solid, we identified a failing internal processor in the original module. We installed one of our VIN-programmed PCMs, performed the security relearn, and the van ran perfectly. The owner was thrilled to have his reliable workhorse back without wasting any more money on unnecessary parts.
Is Your PCM Failing? Common Symptoms
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, a failing module could be the culprit:
- ✔ Persistent Check Engine Light (CEL) with communication-related trouble codes (e.g., U-codes).
- ✔ Unexplained engine stalling, hesitation, or misfiring.
- ✔ Harsh, delayed, or incorrect automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Inability for a diagnostic scan tool to communicate with the module.
The Critical Importance of VIN Programming
Simply installing a used or non-programmed module from another vehicle will not work. Each GM vehicle has unique software and calibrations based on its specific options, emissions standards, and components. Our process ensures a perfect match. We take your vehicle’s Vehicle Identification Number (VIN) and flash this module with the latest, most up-to-date official GM software for your exact configuration. This guarantees that your engine, transmission, and all related systems operate exactly as the manufacturer intended. This is the key to a lasting, reliable repair for your 2005-2007 Express 2500 Van PCM.
Simple Process, Professional Results
- ✔ Place Your Order: Complete your purchase for this module.
- ✔ Provide Your VIN: Add your 17-digit VIN to the order notes or reply to your confirmation email. This step is crucial.
- ✔ Installation: Once you receive the part, disconnect the battery, swap the module, and reconnect the battery. In most cases, you will need to perform a security relearn procedure, which can often be done without special tools. A Crankshaft Variation (CASE) relearn may also be required with a compatible scan tool for optimal performance.
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749 and fits a wide range of GM trucks and vans, including the Chevrolet Silverado, GMC Sierra, Suburban, Avalanche, and more. Please verify the fitment list to ensure compatibility with your specific vehicle.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine performance, fuel delivery, ignition timing, and automatic transmission shifting to ensure efficiency and reliability.
Does this module come ready to install?
Yes, it comes fully programmed to your vehicle’s VIN with the latest GM software updates. However, you will likely need to perform a security relearn procedure after installation for the vehicle to start.
How do I provide my VIN?
You can enter your 17-digit VIN in the notes section during checkout or simply reply to your order confirmation email with the information. We cannot ship your part until we have your VIN.
What is a security relearn procedure?
It’s a process that syncs the new PCM with your vehicle’s anti-theft system and keys. For many GM vehicles, this can be done by cycling the ignition key and waiting for specific intervals, a process that typically takes about 30 minutes. Instructions are widely available online for your specific model.
Will this fix my vehicle’s problem for sure?
This part will correct any issues directly caused by a faulty PCM. While the symptoms listed are common for PCM failure, we always recommend a thorough diagnosis by a qualified technician to confirm the module is the root cause before ordering.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for service numbers 12589462, 12602801, and 89017749.