Restore Your Van’s Core Performance and Reliability
As a technician with over two decades of experience, I know that when a workhorse like your 2005-2007 Savana 2500 Van starts acting up, it’s not just an inconvenience—it’s a threat to your schedule and your business. The Powertrain Control Module (PCM), often called the vehicle’s brain, is responsible for managing everything from fuel mixture and ignition timing to transmission shifting. When it fails, you’re often left chasing ghosts: random warning lights, stalling, no-start conditions, and terrible fuel economy. This isn’t just a part; it’s the central command for your van’s entire powertrain.
This replacement Savana 2500 Powertrain Control Module is the definitive solution to these frustrating and often misdiagnosed issues. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle using your VIN. This ensures that all factory settings and the latest GM software updates are loaded before it even ships. You’re not just getting a replacement part; you’re getting a fully integrated component ready to restore your van’s original performance and dependability.
Case Study: A Tricky Diagnosis
I remember a 2006 Express van (which uses the same PCM) that came into my shop. The owner had spent a small fortune replacing spark plugs, ignition coils, and even a mass airflow sensor trying to fix an intermittent stalling problem and a P0300 (Random/Multiple Misfire Detected) code. The engine would run fine for days, then suddenly die at a stoplight. After checking all the usual suspects, we hooked up a scope to the injector and coil control signals from the PCM. We saw the signals drop out randomly, just for a split second—enough to cause a stall but not long enough to consistently set a specific circuit code. A new, properly programmed PCM fixed it instantly. This highlights how a failing Savana 2500 Powertrain Control Module can mimic many other component failures, making a quality replacement essential.
Is Your Van’s Brain Failing? Common PCM Symptoms
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially after the vehicle has warmed up.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication issues with your diagnostic scan tool.
- ✔ Other modules on the vehicle setting ‘loss of communication with PCM’ codes (U-codes).
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. The key is to follow the steps carefully to ensure a smooth process. For the Savana and Express vans, the module is conveniently located in the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most 2005-2007 Savana/Express vans, you’ll find the PCM in the left-hand rear of the engine compartment. It’s a silver metal box with several large electrical connectors.
- Disconnect the Connectors: Carefully unlatch and remove all electrical harness connectors from the old PCM. These connectors have locking tabs or levers; do not force them. Inspect the terminals for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the mounting hardware, as you will need it for the new module.
- Install the New PCM: Mount the new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In many cases, you will need to perform a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service manual for the specific procedure.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following vehicles and options. Please verify your vehicle is on this list before ordering.
AVALANCHE 2500 05-06 (LH front under battery)
BLAZER S10/JIMMY S15 05 (RH front engine compartment)
CTS 04-05 V-Series (RH engine compartment, ID 12589462 or 12602801)
EXPRESS/SAVANA 1500 VAN 05-07 (LH rear engine compartment)
EXPRESS/SAVANA 2500 VAN 05-07 Gasoline (LH rear engine compartment)
EXPRESS/SAVANA 3500 VAN 05-07 Gasoline (LH rear engine compartment)
SAFARI (GMC) 05 (LH front by battery)
SIERRA/SILVERADO 1500 PICKUP 05-06 (LH front under battery, w/4.3L, w/o hybrid)
SIERRA/SILVERADO 1500 PICKUP 07 Classic Style (LH front under battery, w/4.3L, w/o hybrid)
SIERRA/SILVERADO 2500 PICKUP 05-06 Gasoline, 8.1L (LH front under battery)
SIERRA/SILVERADO 2500 PICKUP 07 Classic Style, Gasoline, 8.1L (LH front under battery)
SIERRA/SILVERADO 3500 PICKUP 05-06 Gasoline, 8.1L (LH front under battery)
SIERRA/SILVERADO 3500 PICKUP 07 Classic Style, Gasoline, 8.1L (LH front under battery)
SUBURBAN 2500 05-06 8.1L (LH front under battery)
YUKON XL 2500 05-06 8.1L (LH front under battery)
Frequently Asked Questions
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load the module with your vehicle’s specific Vehicle Identification Number (VIN) and the latest factory software from GM. This ensures the PCM works perfectly with your engine, transmission, and options, eliminating the need for an expensive trip to the dealership for programming.
Do I need to send my old PCM (core) back?
This listing does not require a core return. You can keep or dispose of your old module, saving you time and return shipping costs.
Will I need to perform any other procedures after installation?
In most GM vehicles of this era, you will need to perform a security relearn procedure, also known as the Passlock or Passkey relearn. It’s a simple process that syncs the new PCM to your vehicle’s anti-theft system and can be done without special tools.
My original part number is not 89017749, but it is on the compatible list. Will this work?
Yes. Manufacturers often supersede part numbers. This module, when programmed to your VIN, is a direct replacement for all part numbers listed in the description, including 12589462 and 12602801.
What information do you need from me?
After you complete your purchase, we will need the 17-digit VIN from your vehicle. You can typically find this on your dashboard (visible through the windshield) or on the driver’s side door jamb sticker.