Restore Your GM Truck’s Performance and Reliability
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, or a no-start condition in your 2003 Chevy Blazer S10 or GMC Jimmy S15, the heart of the problem is often the Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing PCM can create a cascade of baffling symptoms. This isn’t just a component; it’s the brain of your vehicle, and when it falters, everything from fuel delivery to transmission shifting can be affected.
This replacement PCM, part number 89017733, is the definitive solution. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This means it arrives at your door loaded with the latest factory software from GM, addressing common drivability issues and ensuring optimal performance. You get a reliable part that’s ready for installation right out of the box, saving you a costly trip to the dealership and the expense of their programming services.
A Technician’s Notebook: The Intermittent Stall
I remember a 2003 GMC Jimmy that came into the shop with a problem that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a history of random communication errors. After checking all the usual suspects—fuel pressure, ignition system, crank sensor—we focused on the PCM. On these models, heat and vibration can cause microscopic cracks in the circuit board’s solder joints. We swapped in a pre-programmed PCM, and the problem vanished instantly. It’s a classic example of how a faulty 2003 Blazer S10 PCM can mimic a dozen other issues.
Is Your Vehicle Showing These Signs of PCM Failure?
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error), P0602, P0604, or P0606.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine runs rough, misfires, or stalls unexpectedly.
- ✔ Failure to pass an emissions or smog test.
- ✔ Loss of communication with the scan tool.
A Straightforward Guide to Installation
- ✔ Safety First: Always begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the Module: On the 2003 Blazer, Jimmy, and S-10/Sonoma, the PCM is typically found in the engine compartment on the right-hand (passenger) side, often near the firewall or inner fender. For vans and larger trucks, check the locations noted in the fitment list below.
- ✔ Disconnect Connectors: Carefully unlatch and remove the electrical wiring harnesses from the old PCM. The levers can be stiff, so apply steady, even pressure. Inspect the connectors for any corrosion or bent pins.
- ✔ Swap the PCM: Unbolt the old module from its mounting bracket and set it aside. Mount your new, pre-programmed PCM in its place and secure it with the original hardware.
- ✔ Reconnect and Power Up: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Security Relearn Procedure: In some cases, you may need to perform a simple security relearn. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. Your vehicle should then start and run normally with its new 2003 Blazer S10 PCM.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles. Please confirm your model and options below. This part is compatible with service numbers including 12581565, 12570557, 12576106, 89017733, and more.
- Astro / Safari (GMC) 2003: Electronic Control Module; (LH front by battery)
- Avalanche 2500 2003: Electronic Control Module; (LH front under battery)
- Blazer S10 / Jimmy S15 2003: Electronic Control Module; (RH front engine compartment)
- CTS 2004: Electronic Control Module; (RH engine compartment), Base, ID 12581565
- Corvette 2004: Electronic Control Module; (RH engine compartment), ID 12581565
- Express / Savana Vans (1500, 2500, 3500) 2003: Electronic Control Module; (LH rear engine compartment)
- S10 / S15 / Sonoma 2003: Electronic Control Module; (RH front engine compartment), 4.3L
- Sierra / Silverado Pickups (1500) 2003: Electronic Control Module; (LH front under battery), w/4.3L
- Sierra / Silverado Pickups (2500, 3500) 2003: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- Suburban 2500 2003: Electronic Control Module; (LH front under battery), 8.1L
- Yukon XL 2500 2003: Electronic Control Module; (LH front under battery), 8.1L
Solving your vehicle’s electronic issues shouldn’t be a complicated ordeal. By providing us with your VIN, you’re getting a fully updated and correctly configured 2003 Blazer S10 PCM that restores function and gives you peace of mind. Place your order today to get your truck back on the road where it belongs.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s specific VIN before we ship it. It arrives ready for installation, with no extra programming required.
Where do I find my vehicle’s 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.
Is this a guaranteed fix for my vehicle’s problems?
This module will correct any issues directly caused by a faulty PCM. However, it’s crucial to ensure your vehicle has been properly diagnosed, as other failing sensors or wiring issues can sometimes mimic PCM failure.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. It typically involves cycling the ignition key and waiting, as described in the installation steps. No special tools are needed.
What information do you need from me after I order?
After you complete your purchase, you will need to provide us with your full 17-digit VIN. We cannot program and ship your module without it.
Are all the part numbers listed compatible with each other?
Yes. The listed service numbers (e.g., 12581565, 12576106, 89017733) are all interchangeable for the applications listed. This module is the correct replacement for any of them.