Restore Peak Performance to Your GM Workhorse
Is your 2005, 2006, or 2007 Chevy Express or GMC Savana van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and costly issues. As the central computer of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shifting. When it fails, your van’s reliability disappears. This isn’t just an inconvenience; for a work vehicle, it’s lost time and money. This replacement module is your direct, reliable solution to get your van back on the road and running like it should.
From the Diagnostic Bay: The Phantom No-Start
I remember a 2006 Express 2500 that came into my shop on a tow truck. The owner, a plumber, said it would randomly refuse to start. He’d already replaced the battery and alternator, but the problem persisted. After connecting my scan tool, I found no communication with the PCM—a classic sign. The module wasn’t just failing; it was intermittently dying completely. These PCMs, especially in work vans that see high temperatures and constant vibration, can develop internal circuit board failures. We installed a VIN-programmed module just like this one. The van started immediately, and the customer was back on the job the same afternoon, saving him from another day of lost business. This isn’t just a part; it’s a dependable fix for a critical problem.
Is Your Van Showing These Signs of PCM Failure?
A failing PCM can cause a wide range of symptoms. If you’re experiencing any of the following, this module is likely the solution you need. Look out for:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0602, or P0606.
- ✔ Engine stalling, stumbling, or misfiring
- ✔ No-start or hard-start conditions
- ✔ Poor or erratic automatic transmission shifting
- ✔ Decreased fuel economy
- ✔ Communication errors with scan tools
The Critical Advantage: VIN-Specific Programming
Don’t settle for a generic, unprogrammed module that will leave you stranded and require an expensive trip to the dealership. We take the hassle out of the repair. Before we ship your part, our technicians will flash this 2005-2007 Express 2500 PCM with the latest, most stable software updates from General Motors, using the specific Vehicle Identification Number (VIN) from your van. This ensures perfect compatibility with your vehicle’s engine, transmission, and options. It’s a true plug-and-play solution designed to restore factory performance and reliability right out of the box.
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. On the Express and Savana vans, the module is typically located in the engine compartment on the driver’s side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the PCM: On most 2005-2007 Express/Savana vans, you’ll find the PCM mounted on a bracket in the rear driver’s side of the engine bay.
- Disconnect the Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Security Relearn (If Necessary): In many cases, you can simply turn the key and start the vehicle. However, some GM vehicles may require a security relearn procedure. This can often be done without special tools by cycling the key. Consult your vehicle’s service information for specific steps if it fails to start due to the security system.
Verified Vehicle Compatibility
This module, part number 12589462, is a direct replacement for service numbers 12589462, 12602801, and 89017749. It fits a wide range of GM trucks and vans. Please confirm your vehicle is on this list:
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), SILVERADO 2500 PICKUP (05-07 Classic), SILVERADO 3500 PICKUP (05-07 Classic), 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), SIERRA 2500 PICKUP (05-07 Classic), SIERRA 3500 PICKUP (05-07 Classic), YUKON XL 2500 (05-06)
Cadillac:
CTS (04-05, V-Series with matching ID)
Frequently Asked Questions
How does the VIN programming process work?
After you complete your purchase, simply provide us with your vehicle’s 17-digit VIN. Our technicians use this number to access the latest GM-certified software for your exact vehicle configuration. We then flash the module, so it arrives ready to install without any need for dealer intervention.
Is this a difficult part to install myself?
For most DIYers with basic mechanical skills, this is a straightforward installation. The module is typically easy to access in the engine bay, and the process involves disconnecting the battery, swapping the modules, and reconnecting everything. Please see our installation guide above for the basic steps.
Will I need to perform any other procedures after installation?
In most cases, no. Because the module is pre-programmed, it should be plug-and-play. However, some GM vehicles may require a simple security relearn procedure or a Crankshaft Variation (CASE) relearn for optimal performance, which may require a capable scan tool.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM (Powertrain Control Module) typically controls both the engine and transmission, while an ECM (Engine Control Module) controls only the engine. For most vehicles on the fitment list, this part functions as the PCM.
Does this part fix bad fuel mileage?
If your poor fuel economy is caused by a faulty PCM sending incorrect data for fuel mixture or ignition timing, then yes, replacing it with this properly functioning module can restore your vehicle’s efficiency.