Restore Your Van’s Brain and Get Back to Work
Is your 2005-2007 Chevy Express 1500 Van giving you headaches? Unexplained stalling, a persistent Check Engine Light, or rough performance can bring your work or travels to a grinding halt. Often, the culprit is a failing Powertrain Control Module (PCM), the central computer managing your engine’s performance, fuel delivery, and emissions. This isn’t just a part; it’s the command center for your vehicle’s reliability. A faulty one can cause endless frustration and lead to failed emissions tests.
This replacement PCM is your direct, reliable solution. We take the guesswork and high dealership costs out of the equation. Before we ship it, we program the module with the very latest GM-certified software, tailored specifically to your van using its unique Vehicle Identification Number (VIN). This ensures seamless communication with your vehicle’s other systems and often corrects underlying software issues the original module may have had from the factory. Getting a reliable 2005-2007 Express 1500 PCM has never been easier.
A Technician’s Notebook
I remember a call from a local delivery service. Their 2006 Express 1500 would randomly die at stoplights, with no codes stored initially. After a few weeks, it finally threw a P0601 (Internal Control Module Memory Check Sum Error). They had already replaced the battery and checked the grounds, common first steps. We installed one of our pre-programmed PCMs, performed the quick security relearn, and that van was back in service the same afternoon. It’s a classic failure mode I’ve seen dozens of times; the internal processors fail, causing intermittent and unpredictable problems that are impossible to fix without replacing the unit.
Is Your Van Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution you need. In my shop, these are the tell-tale signs I look for:
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ The transmission shifts erratically or harshly.
- ✔ Your vehicle fails an emissions or smog test.
- ✔ Intermittent stalling or rough idling for no apparent reason.
A Straightforward Guide to Installation
Installing your new 2005-2007 Express 1500 PCM is a manageable job for a confident DIYer. The key is the security relearn procedure, which is required to sync the new module with your vehicle’s anti-theft system. No advanced scan tool is needed for this step.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On the Express/Savana vans, the PCM is typically located in the engine compartment on the driver’s side, near the back.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new PCM into place and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (Crucial Step): Attempt to start the engine; it will crank but not run. Leave the key in the ‘ON’ position for 10-12 minutes, or until the ‘Security’ light on the dash stops flashing and turns off. Turn the key off for 10 seconds, then repeat this cycle two more times (for a total of three 10-minute cycles). The vehicle should now start and run.
- CASE Relearn (Recommended): For optimal performance and to prevent a P1336 code, a Crankshaft Variation (CASE) relearn is recommended. This requires a bi-directional scan tool and is a quick procedure for any professional mechanic.
Will This Fit My Vehicle?
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following models, but please provide your VIN to ensure perfect programming.
SILVERADO & SIERRA 1500 05-07 Classic (LH front under battery), 4.3L
SILVERADO & SIERRA 2500/3500 05-07 Classic (LH front under battery), gasoline, 8.1L
EXPRESS & SAVANA 1500/2500/3500 05-07 (LH rear engine compartment), gasoline engines
SUBURBAN 2500 & YUKON XL 2500 05-06 (LH front under battery), 8.1L
AVALANCHE 2500 05-06 (LH front under battery)
BLAZER S10/JIMMY S15 05 (RH front engine compartment)
ASTRO 05 (LH front by battery)
CTS 04-05 V-Series (RH engine compartment), ID 12589462 or 12602801
…and more. Providing your VIN is the best way to confirm compatibility.
Frequently Asked Questions about this 2005-2007 Express 1500 PCM
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is essential for us to program the PCM with the correct, latest GM software for your van’s specific engine, transmission, and options. This ensures a perfect match and proper function right out of the box.
Is this a difficult part to install myself?
The physical replacement is straightforward for most DIYers with basic tools. The most important part is performing the security relearn procedure correctly, which we outline in our installation guide. It takes about 30 minutes and requires no special tools.
Will this fix my ‘No Start’ problem?
If your no-start issue is caused by a failed PCM (a very common reason), then yes, this part will resolve it. Symptoms like the engine cranking but not firing, especially with PCM-related trouble codes, point to this being the correct fix.
Do I need to have the dealership do anything after installation?
No! Our programming service eliminates the need for a trip to the dealer. Once you perform the security relearn, your vehicle will be ready to drive. A CASE relearn with a scan tool is recommended for optimal performance but is not always required to get the vehicle running.
What if my original part number is 12589462 or 12602801?
This module, part number 89017749, is a fully compatible and updated replacement for those earlier part numbers. It will function identically once programmed to your vehicle’s VIN.