Restore Your Van’s Reliability and Performance
As a technician with over two decades of experience, I know that a faulty Powertrain Control Module (PCM) can turn a dependable workhorse like your 2005-2007 GMC Savana 1500 into a source of constant frustration. If you’re dealing with baffling issues like random stalling, poor fuel mileage, erratic shifting, or a persistent Check Engine Light, the PCM is often the culprit. It’s the brain of your vehicle, and when it fails, it can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; for a work van, downtime means lost income.
This replacement PCM, part number 89017749, is the definitive solution. We take the guesswork and hassle out of the repair. Before we ship it, our specialists will program the module with the latest GM software updates, specifically matched to your van’s unique Vehicle Identification Number (VIN). This means it arrives at your door ready for a straightforward installation, with no need for an expensive trip to the dealership for programming. You get a reliable, plug-and-play fix that restores your engine’s efficiency and your transmission’s smooth operation.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 2006 Savana 2500 that came into my shop with a list of complaints that didn’t seem to connect. The owner, a plumber, said it would occasionally refuse to shift out of first gear, the A/C would cut out randomly, and the check engine light would flicker. He’d already replaced the alternator and a speed sensor at another shop with no luck. After hooking up my scan tool, I saw a handful of communication error codes (U-codes) alongside a P0601 (Internal Control Module Memory Check Sum Error). This combination is a classic sign of a failing PCM. The module wasn’t just failing internally; it was disrupting communication across the entire vehicle network, creating ‘ghost’ problems. We installed a VIN-programmed PCM just like this one, and every single issue disappeared. It’s a powerful reminder that starting with the vehicle’s ‘brain’ can save hundreds in unnecessary parts and labor.
Is Your Savana Exhibiting These PCM Failure Signs?
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:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100.
- ✔ 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 at idle.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Your 2005-2007 Savana 1500 PCM Installation
This module is designed for an easy swap. With basic hand tools, you can get your van back in service quickly. Always consult a repair manual for your specific vehicle, but here is a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the Module: On most Savana and Express vans, the PCM is located in the engine compartment, on the driver’s side (LH) towards the rear.
- Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old PCM: Unbolt the mounting hardware that secures the old PCM to its bracket or the firewall. Remove the old module from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and let it run for a few minutes. Check for a smooth idle and ensure the Check Engine Light is off. A security relearn procedure may be required on some models, which typically involves cycling the key.
Verified Fitment for Your GM Vehicle
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following vehicles. Please verify your specific model and options to ensure compatibility.
SAVANA/EXPRESS 1500 (2005-2007)
SAVANA/EXPRESS 2500 (2005-2007)
SAVANA/EXPRESS 3500 (2005-2007)
ASTRO/SAFARI (2005)
GMC/Chevrolet Trucks & SUVs:
SILVERADO/SIERRA 1500 (2005-2007 Classic, 4.3L)
SILVERADO/SIERRA 2500/3500 (2005-2007 Classic, 8.1L Gasoline)
SUBURBAN 2500 (2005-2006, 8.1L)
AVALANCHE 2500 (2005-2006)
YUKON XL 2500 (2005-2006, 8.1L)
BLAZER S10/JIMMY S15 (2005)
Cadillac:
CTS (2004-2005, V-Series, check ID)
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load the module with the specific software and calibrations for your exact vehicle using your VIN. This ensures perfect compatibility with your engine, transmission, and options, eliminating the need for dealer programming.
Do I need to send my old PCM back (core charge)?
This listing does not require a core return. You can keep or dispose of your old module, saving you the time and expense of a core shipment.
Is any other programming needed after I install it?
In most cases, no. This is a plug-and-play solution. However, some GM vehicles require a simple security relearn procedure (often called a CASE relearn or Passlock relearn) which can typically be done without special tools. Instructions are readily available online or in service manuals.
Where do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot program and ship the module without it.
Will this fix my specific problem?
This module will correct any issues directly caused by a faulty PCM. While the symptoms listed are common, it’s always best to have a proper diagnosis performed to confirm the PCM is the root cause of your vehicle’s issues.