Restore Your Van’s Core Performance and Reliability
Is your 2005-2007 Chevrolet Express 1500 van giving you headaches? Unexplained stalling, a stubborn check engine light, or erratic shifting can take a reliable workhorse off the road. As a technician with over two decades of experience under the hood, I’ve seen these exact issues countless times. The culprit is often a failing Powertrain Control Module (PCM)—the central computer of your vehicle. This isn’t just a part; it’s the brain behind your engine’s operation, and when it falters, everything else does too.
We take the guesswork and dealer hassle out of the repair. This replacement PCM, part number 12589462, comes fully programmed to your van’s specific Vehicle Identification Number (VIN). We install the latest, most stable software from GM, ensuring your vehicle operates exactly as the manufacturer intended. This means improved fuel efficiency, smoother transmission shifts, and a permanent fix for many frustrating diagnostic trouble codes.
A Technician’s Notebook: The Intermittent Stall That Stumped Everyone
I remember a 2006 Express 2500 from a local plumbing company that came into the bay. The driver reported it would stall randomly, but only after it had been running for over an hour on hot days. Two other shops had already thrown parts at it without success. A scan tool showed no hard codes, just a history of lost communication faults. Based on experience, I suspected a heat-soaked PCM. We ordered this exact pre-programmed module. The swap took less than 20 minutes. The van went back into service and the plumbing company called a week later to say their van had never run better. That’s the power of a reliable, correctly programmed module.
Is Your GM Vehicle Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is the likely solution for your 2005-2007 Express 1500 PCM problems:
- ✔ Persistent Check Engine Light (CEL) for codes like P0601, P0602, or P0606 (Internal Module Failure).
- ✔ Vehicle refuses to start, but the engine cranks over.
- ✔ Unpredictable stalling, especially when the engine is warm.
- ✔ Noticeably worse fuel economy.
- ✔ Harsh, jerky, or delayed transmission shifting.
- ✔ Inability to pass an emissions test due to communication errors.
A Straightforward Guide to Installation
Replacing the PCM on your Express or Savana van is a job most DIYers can handle with basic tools. Our pre-programming service means you won’t need a trip to the dealer for flashing.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electrical components.
- Locate the PCM: On most Express and Savana vans, the module is found in the engine compartment on the driver’s side, near the firewall.
- Disconnect Wiring: Carefully unlatch and remove the main electrical harness connectors. Avoid forcing them; there are locking tabs that need to be released first.
- Remove Old Module: Unbolt the old PCM from its mounting bracket and set it aside.
- Install New Module: Secure your new, pre-programmed PCM onto the bracket. Re-attach the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. In some cases, a simple security relearn procedure is required. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes before starting the engine.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following vehicles, among others. Please verify your part number or contact us with your VIN to confirm.
AVALANCHE 2500 05-06
BLAZER S10 05
EXPRESS 1500 VAN 05-07
EXPRESS 2500 VAN 05-07
EXPRESS 3500 VAN 05-07
SILVERADO 1500 PICKUP 05-07 (Classic Style)
SILVERADO 2500 PICKUP 05-07 (Classic Style)
SILVERADO 3500 PICKUP 05-07 (Classic Style)
SUBURBAN 2500 05-06
GMC:
ASTRO 05
JIMMY S15 05
SAFARI 05
SAVANA 1500 VAN 05-07
SAVANA 2500 VAN 05-07
SAVANA 3500 VAN 05-07
SIERRA 1500 PICKUP 05-07 (Classic Style)
SIERRA 2500 PICKUP 05-07 (Classic Style)
SIERRA 3500 PICKUP 05-07 (Classic Style)
YUKON XL 2500 05-06
Cadillac:
CTS 04-05 (V-Series, verify ID)
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply reply to the order confirmation email with your vehicle’s 17-digit VIN. We’ll handle the rest before shipping.
Is this part really ready to install out of the box?
Yes. We flash the module with the latest GM software matched to your VIN. This makes the installation process as simple as possible, saving you a trip to the dealership. A simple key-on security relearn may be needed.
My original part number is 12602801. Will this part work?
Absolutely. This module, 12589462, is the correct, manufacturer-specified service replacement for part numbers 12602801 and 89017749.
Do I need to send my old PCM back?
No. There is no core charge or requirement to return your old module. You can recycle it locally.
What if I run into an issue during installation?
We’re here to help. Our support team consists of experienced automotive professionals who can help guide you through the process. Your success is our priority.