Restore Peak Performance to Your GM Workhorse
Is your 2005-2007 GMC Savana 2500 van suddenly unreliable? As a technician with over two decades of experience, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can bring a dependable work vehicle to a standstill. Erratic shifting, a persistent check engine light, or a no-start condition can cost you time and money. This isn’t just an inconvenience; it’s a hit to your bottom line. This replacement PCM is the reliable, straightforward solution to get your van back on the road and working as hard as you do.
This isn’t just a part in a box. We take the hassle out of the repair by programming this module specifically for your vehicle using your VIN. This critical step ensures it has the latest, most stable software updates from GM, which often resolve underlying issues the original factory software had. By providing your VIN at checkout, you receive a unit that is ready for installation, eliminating the need for an expensive trip to the dealership for programming. It’s a direct-fit solution designed to restore the precise engine and transmission control your vehicle had when it was new.
Is Your Van Showing These Signs of a Bad PCM?
A failing PCM can cause a wide range of confusing symptoms. If you’re experiencing any of the following, a faulty module could be the culprit. In my shop, these are the classic red flags I look for:
- ✔ Check Engine Light is on with codes like P0601, P0602, or P0606 (Internal Control Module errors).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling, especially after the engine has warmed up.
- ✔ Rough or erratic idling and poor engine performance.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Communication errors with your scan tool.
Case Study: A Tricky Diagnosis
A local contractor brought in his ’06 Savana 2500 with a frustrating problem: it would run perfectly for about 20 minutes, then stall and refuse to restart for an hour. There were no consistent trouble codes. After checking fuel pressure and ignition components, we suspected a heat-related failure. We carefully heated the original PCM with a heat gun, and within minutes, the engine stalled. After it cooled, it started right back up. We confirmed the internal circuitry of the old PCM was failing under thermal stress. Installing one of our VIN-programmed modules solved the problem permanently, getting him back to his job site the next day.
Your Straightforward PCM Installation Guide
Replacing the PCM on your Savana is a manageable job for a DIYer with basic tools. For the 2005-2007 Savana 2500, you’ll typically find the module in the left-hand rear of the engine compartment. Always consult a repair manual for your specific vehicle if you’re unsure.
- 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 your Savana van, it’s typically located in the engine bay on the driver’s side, near the firewall.
- Disconnect the 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 Module: Unbolt the PCM from its mounting bracket. There are usually a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the correct sockets on the new module until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn (If Needed): In many cases, you may need to perform a simple security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are readily available online for your specific model.
Verified Compatibility for Your GM Vehicle
This module is a direct replacement for original part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following vehicles and configurations:
- Chevrolet Express & GMC Savana Vans (1500, 2500, 3500): 2005, 2006, 2007
- Chevrolet Silverado & GMC Sierra Pickups (1500, 2500, 3500): 2005, 2006, 2007 (Classic Style)
- Chevrolet Avalanche, Suburban & GMC Yukon XL (2500): 2005-2006 (with 8.1L engine)
- Chevrolet Astro & GMC Safari Vans: 2005
- Chevrolet Blazer S10 & GMC Jimmy S15: 2005
- Cadillac CTS-V: 2004-2005
Please use the fitment chart and verify your part number to ensure you are ordering the correct component for your vehicle’s specific engine and options.
Frequently Asked Questions about this 2005-2007 Savana 2500 PCM
Do I need to do any programming after I install it?
No. This module arrives pre-programmed to your vehicle’s VIN with the latest GM software. In some cases, a simple key/security relearn procedure is required, which you can do yourself in about 15 minutes without any special tools.
What information do you need from me?
After you place your order, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it.
Is this a direct replacement for other part numbers?
Yes, this module is a fully compatible replacement for part numbers 12589462, 12602801, and 89017749.
Will this fix my transmission shifting problems?
The PCM controls both engine and transmission functions. If the shifting issues are caused by faulty electronic commands from a failing PCM, then yes, this part will resolve them. However, it will not fix internal mechanical failures in the transmission.
Where is the PCM located on my 2007 Savana 2500?
On most 2005-2007 Savana and Express vans, the PCM (or ECM) is located in the engine compartment on the driver’s side, near the firewall or brake master cylinder.