Is Your Chevy Express Van Running Rough?
If your 2005, 2006, or 2007 Chevrolet Express 1500 is suffering from perplexing issues like poor fuel economy, erratic shifting, a persistent Check Engine Light, or even a no-start condition, the culprit is often a failing Powertrain Control Module (PCM). As the central computer for your van’s engine and transmission, a faulty PCM can cause a cascade of problems that are frustrating to diagnose and can leave your vehicle unreliable. Don’t let a bad module keep your workhorse off the road. This direct-replacement PCM, part number 12602801, is the definitive solution to restore your van’s performance and dependability.
From the Diagnostic Bay
We had a 2006 Express 2500 in the shop that was a fleet vehicle for a local plumber. The complaint was intermittent stalling and a flashing Check Engine Light with random misfire codes. The owner had already replaced the spark plugs, wires, and even the fuel pump based on another shop’s advice, with no success. After hooking up our scan tool and monitoring live data, we noticed the fuel trim and ignition timing commands were all over the place, with no rhyme or reason. This pointed directly to a processing error inside the computer. We installed a VIN-programmed PCM, performed the security relearn, and the van ran perfectly. It was a classic case of a failing computer mimicking mechanical problems, costing the owner time and money on unnecessary parts.
Symptoms of a Failing 2005-2007 Express 1500 PCM
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Unexplained Check Engine Light (CEL) illumination, often with communication error codes (U-codes).
- ✔ Poor engine performance, including hesitation, stalling, or rough idling.
- ✔ Decreased fuel efficiency for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine cranks but refuses to start.
- ✔ Failure to pass state emissions testing.
- ✔ Inconsistent or non-functional gauges on the instrument cluster.
The Plug-and-Play Solution
What sets this module apart is our professional programming service. We don’t just send you a part; we deliver a solution. When you purchase this 2005-2007 Express 1500 PCM, we will flash it with the latest GM-certified software updates specifically for your vehicle. All you need to do is provide us with your van’s 17-digit Vehicle Identification Number (VIN) during or after checkout. This critical step ensures that the PCM is correctly calibrated for your engine, transmission, and factory options, making the installation process as smooth as possible. This eliminates the need for an expensive trip to the dealership for programming.
This module is a direct replacement for several part numbers, including 12602801, 12589462, and 89017749. It fits a wide range of GM trucks and vans from the mid-2000s, ensuring broad compatibility and a perfect fit. Please verify your part number or consult the detailed fitment list below to confirm this is the correct component for your vehicle.
Why Choose Our Pre-Programmed PCM?
Choosing a pre-programmed module saves you significant time, money, and hassle. A dealership visit for programming alone can cost hundreds of dollars and take your vehicle out of service. Our process streamlines the repair, getting you back on the road faster. We use professional-grade equipment to load the correct software, ensuring optimal engine performance, fuel economy, and emissions compliance right out of the box. After installation, you may need to perform a simple security relearn procedure (often called a CASE relearn or Passlock relearn), which can typically be done without special tools and instructions are widely available.
Restoring the brain of your vehicle’s powertrain is a critical repair. Trust our expertly programmed 2005-2007 Express 1500 PCM to get the job done right the first time.
Frequently Asked Questions
Do I need to send my old PCM (core) back?
No core charge or return is required for this particular part. You can keep or responsibly dispose of your old module.
How do I provide my VIN number?
You can add your 17-digit VIN to the notes section during checkout or send it to us in a message after you complete your purchase. We cannot ship the module until we have your VIN to program it.
Is this module difficult to install?
The physical installation is straightforward for someone with basic mechanical skills. It’s typically located in the engine bay. The most important step after installation is performing the security relearn procedure, which pairs the new PCM to your vehicle’s anti-theft system.
What if my part number is slightly different?
This module replaces multiple OEM part numbers, including 12589462 and 89017749. As long as your vehicle is on the compatibility list and your original part is one of these numbers, this module will work perfectly.
Will this fix my Check Engine Light?
If the Check Engine Light and associated codes are caused by a faulty PCM, then yes, this will resolve the issue. It’s always recommended to have a proper diagnosis to confirm the PCM is the root cause before ordering.