Restore Your Van’s Core Performance and Reliability
Is your 2005-2007 Chevy Express 1500 Van suddenly giving you headaches? Unexplained stalling, poor fuel mileage, or a persistent Check Engine Light can bring your work or travels to a grinding halt. The Powertrain Control Module (PCM) is the central computer of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it fails, the symptoms can be frustrating and difficult to diagnose. This isn’t just a part; it’s the solution to getting your dependable GM vehicle back in top form.
We take the guesswork and hassle out of the repair. This replacement PCM, compatible with part numbers 12602801, 12589462, and 89017749, arrives at your door programmed specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our technicians will flash the module with the latest, most stable software updates from GM. This ensures optimal performance and resolves many issues caused by outdated factory programming.
Case Study: A Tricky Diagnosis
I once had a 2006 Savana work van in my bay that was a real puzzle. The owner reported intermittent stalling at stoplights, but with no consistent Check Engine codes. We checked the fuel pressure, ignition system, and sensors—everything looked perfect. The problem was so random it was nearly impossible to replicate. On a hunch, after monitoring live data, I noticed a momentary drop in communication from the PCM right before a stall. We swapped in a VIN-programmed module like this one. The van never stalled again. It’s a classic example of how internal PCM degradation can cause ghost-like issues that defy standard diagnostic procedures.
Is Your GM Van or Truck Showing These Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty module could be the culprit:
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error), P0606 (ECM/PCM Processor Fault), or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
Replacing the 2005-2007 Express 1500 PCM is a job most DIYers can handle. Our pre-programming eliminates the need for expensive dealer-only tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On Express and Savana vans, the PCM is typically found in the left-hand (driver’s side) rear of the engine compartment. On trucks like the Silverado or Sierra, it’s usually under the battery tray on the driver’s side.
- 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, programmed PCM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Reconnect Battery: Re-attach the negative battery terminal and tighten it.
- Perform Security Relearn: This final, critical step syncs the new PCM with your vehicle’s anti-theft system. The procedure is simple and requires no tools (see our FAQ below).
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your specific model and options below.
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 1500 VAN 05-07 (LH rear engine compartment)
EXPRESS 2500 VAN 05-07 (LH rear engine compartment, gasoline)
EXPRESS 3500 VAN 05-07 (LH rear engine compartment, gasoline)
SAFARI (GMC) 05 (LH front by battery)
SAVANA 1500 VAN 05-07 (LH rear engine compartment)
SAVANA 2500 VAN 05-07 (LH rear engine compartment, gasoline)
SAVANA 3500 VAN 05-07 (LH rear engine compartment, gasoline)
SIERRA 1500 PICKUP 05-07 Classic (LH front under battery, 4.3L, w/o hybrid)
SIERRA 2500 PICKUP 05-07 Classic (LH front under battery, 8.1L, gasoline)
SIERRA 3500 PICKUP 05-07 Classic (LH front under battery, 8.1L, gasoline)
SILVERADO 1500 PICKUP 05-07 Classic (LH front under battery, 4.3L, w/o hybrid)
SILVERADO 2500 PICKUP 05-07 Classic (LH front under battery, 8.1L, gasoline)
SILVERADO 3500 PICKUP 05-07 Classic (LH front under battery, 8.1L, gasoline)
SUBURBAN 2500 05-06 (LH front under battery, 8.1L)
YUKON XL 2500 05-06 (LH front under battery, 8.1L)
Frequently Asked Questions
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We handle the programming for you before we ship the part. Just provide your vehicle’s VIN at checkout, and it will arrive ready for installation and the security relearn procedure.
What is the security relearn procedure?
It’s a simple process to sync the new PCM to your key. After installation, turn the key to the ‘ON’ position for 10-12 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. On the fourth try, the vehicle should start, indicating the new module is synced.
Will this fix my transmission shifting problems?
If the erratic shifting is caused by faulty signals from the PCM, then yes. The PCM controls transmission line pressure and shift points, so a new, correctly programmed module often resolves these electronic-based shifting issues.
Is this a direct replacement for part number 12589462?
Yes, this module is a fully compatible replacement for part numbers 12602801, 12589462, and 89017749. We ensure the software loaded matches your vehicle’s original requirements.
What information do you need from me?
We only need your 17-digit Vehicle Identification Number (VIN). This allows us to access the correct GM software and flash the module specifically for your vehicle’s engine, transmission, and options.