Restore Your Van’s Core Performance and Reliability
If your 2005-2007 GMC Savana 3500 is experiencing baffling issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition, the root cause is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can create a cascade of problems that are frustrating to diagnose and costly to ignore. This isn’t just a replacement part; it’s a direct solution to restore your van’s operational integrity, fuel efficiency, and dependability.
We take the guesswork and hassle out of the repair. This PCM, compatible with part numbers 12589462, 12602801, and 89017749, arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle’s VIN. This crucial step means you can bypass expensive dealership programming fees and lengthy service appointments. It’s a straightforward, effective fix designed for both professional technicians and savvy DIYers.
From the Diagnostic Bay: The Case of the Unreliable Work Van
A local contractor brought in his ’06 Savana 3500 work van, complaining of intermittent stalling at stoplights and a transmission that would sometimes refuse to shift out of first gear. He’d already replaced the throttle body and a speed sensor with no luck. The check engine light was on, but the codes were inconsistent. In my shop, I’ve seen this exact pattern hundreds of times. After verifying power and ground to the module, a quick scan confirmed internal communication errors—a classic sign of PCM failure. The constant heat and vibration in the engine bay of these workhorses can take a toll on the delicate internal circuits over the years. We installed one of our VIN-programmed PCMs, and the van ran perfectly. It’s a reminder that sometimes the most complex symptoms point back to the vehicle’s central brain.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, your engine computer is a likely culprit:
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0606 (Internal Control Module Memory Check Sum Error) or U-series communication codes.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle stalls unexpectedly while driving or idling.
- ✔ Failure to pass an emissions test.
A Straightforward Guide to Installation
Installing your new 2005-2007 Savana 3500 PCM is a simple process that requires basic hand tools. Because we program it beforehand, no further computer work is needed in most cases.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment, typically on the driver’s side towards the rear.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old module. These connectors have locking tabs that may need to be gently pried up.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-attach the wiring harnesses. Ensure they click into place.
- Reconnect and Start: Reconnect the negative battery terminal. The vehicle is now ready to start. It may run slightly differently for the first few miles as it completes its internal relearn cycle.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM trucks and vans. Please verify your vehicle and options below. Your original part number should be 12589462, 12602801, or 89017749.
- ✔ Chevrolet Express & GMC Savana Vans (1500, 2500, 3500): 2005, 2006, 2007
- ✔ Chevrolet Silverado & GMC Sierra Pickups (1500, 2500, 3500): 2005, 2006, 2007 (Classic Style) – Fits 4.3L and 8.1L gasoline engines.
- ✔ Chevrolet Suburban & GMC Yukon XL (2500): 2005-2006 with 8.1L engine.
- ✔ Chevrolet Avalanche (2500): 2005-2006
- ✔ GMC Safari & Chevrolet Astro: 2005
- ✔ Chevrolet S10 Blazer & GMC S15 Jimmy: 2005
- ✔ Cadillac CTS-V: 2004-2005 (ID 12589462 or 12602801)
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming after I install this PCM?
No. We program the module to your specific VIN before shipping. In most vehicles, this is a plug-and-play installation. Some vehicles may require a security or crankshaft position sensor (CASE) relearn, which can be done with a capable scan tool or by a local shop.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
How do I provide my VIN to you?
After you complete your purchase, you will receive instructions on how to send us your VIN. We cannot ship your part until we receive this information.
Does my old part number have to match exactly?
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. As long as your original module carries one of these numbers, this part will be compatible.
Is this a brand new part?
This is a high-quality, tested, and verified OEM component that has been professionally prepared and programmed with the latest software for your vehicle, ensuring reliable performance.