Restore Your Van’s Performance and Reliability
Is your 2005-2007 Chevy Express 2500 Van running rough, stalling unexpectedly, or throwing confusing check engine light codes? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and costly issues. As the central computer for your engine and transmission, its health is critical. This direct-fit PCM, part number 89017749, is the definitive solution to get your workhorse van back on the road, running smoothly and efficiently.
Over my 20+ years in automotive diagnostics, I’ve seen countless vehicles plagued by intermittent electrical gremlins that trace back to a faulty PCM. Symptoms can start small—a slight hesitation or a dip in fuel economy—but can escalate to no-start conditions that leave you stranded. This isn’t just an inconvenience; for a work van, it’s lost time and money. That’s why we offer a reliable, straightforward fix. This module arrives at your door pre-programmed with the latest GM software, specifically matched to your vehicle’s VIN. This eliminates the need for an expensive trip to the dealership for programming, saving you hundreds of dollars and significant downtime.
A Technician’s Notebook: The Phantom Stall
A local contractor brought in his ’06 Savana 2500, a sister vehicle to the Express. The complaint was a phantom stall—it would die at random stoplights, then fire right back up. No consistent codes, just an occasional P0606 (PCM Processor Fault). We checked grounds, wiring, and sensors, but everything tested fine. Experience pointed to the PCM’s internal processor failing under specific thermal conditions. We installed one of our pre-programmed modules, performed a quick security relearn, and the problem vanished. The contractor called a week later, thrilled that his van was finally dependable again. That’s the peace of mind this part provides.
Is Your GM Truck or Van Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100.
- ✔ Your engine cranks but refuses to start.
- ✔ Unexplained drops in fuel mileage.
- ✔ The transmission shifts harshly or at the wrong times.
- ✔ The engine hesitates, stumbles, or stalls intermittently.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
Replacing your 2005-2007 Express 2500 PCM is a job most DIYers can handle with basic tools. Because this module comes pre-programmed, you skip the most difficult step. Follow this general guide for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On Express and Savana vans, the PCM is typically located in the engine compartment on the driver’s side, near the firewall. On trucks, it’s often under the battery tray.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. These usually have a locking tab or lever. Avoid forcing them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a Passlock or VATS relearn) to allow the vehicle to start. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Instructions for this simple procedure are widely available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 89017749, 12589462, and 12602801. It is guaranteed to fit the following GM vehicles. Please note the specific options for your model:
- Chevrolet Express 1500/2500/3500 Van (2005-2007) – Gasoline Engines
- GMC Savana 1500/2500/3500 Van (2005-2007) – Gasoline Engines
- Chevrolet Silverado 1500/2500/3500 (2005-2007 Classic) – 4.3L V6 & 8.1L V8 Gas
- GMC Sierra 1500/2500/3500 (2005-2007 Classic) – 4.3L V6 & 8.1L V8 Gas
- Chevrolet Suburban 2500 (2005-2006) – 8.1L V8
- Chevrolet Avalanche 2500 (2005-2006)
- GMC Yukon XL 2500 (2005-2006) – 8.1L V8
- Chevrolet Blazer S10 / GMC Jimmy S15 (2005)
- GMC Safari / Chevrolet Astro (2005)
- Cadillac CTS (2004-2005) – V-Series, check ID matches
Ordering a 2005-2007 Express 2500 PCM from us is your first step towards a reliable repair. Simply provide your VIN during checkout, and we’ll handle the programming, ensuring your new module is ready for installation right out of the box.
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you’ll provide us with your vehicle’s 17-digit VIN. We use this number to access the latest official GM software for your exact vehicle configuration and flash it onto the module before shipping. This ensures perfect compatibility.
Do I need to do anything else after installation?
Besides the simple security relearn procedure, which takes about 30 minutes and requires no special tools, you may need to have a Crankshaft Position (CASE) relearn performed with a capable scan tool for optimal performance and to clear certain codes. Many local shops can do this for a small fee.
Is this a new or used part?
This is a high-quality, inspected, and tested recycled OEM part. Each unit is verified to be fully functional before being programmed with fresh, vehicle-specific software, offering OEM reliability at a fraction of the cost of a new module.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your original PCM (like codes P0601-P0606), then yes, this part is the correct fix. However, it’s always best to diagnose the root cause of any codes before replacing parts.
What if I have the wrong part number?
This module replaces part numbers 89017749, 12589462, and 12602801. As long as your original module is one of these numbers and your vehicle is on our compatibility list, this is the correct part for you.