Restore Peak Performance to Your GM Truck or SUV
Is your 1998 Chevy Blazer, GMC Jimmy, or another trusty GM vehicle acting up? If you’re dealing with frustrating issues like a persistent check engine light, erratic shifting, stalling, or a no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, a faulty PCM can cause a cascade of problems that are difficult to diagnose. This replacement PCM, part number 09366810, is the reliable, straightforward solution to get your vehicle running right again.
The biggest headache with replacing a PCM is usually the programming. Dealerships charge a premium for this service, and it means extra downtime for your vehicle. We eliminate that step completely. When you purchase this module, we flash it with the latest official GM software updates, specifically matched to your vehicle’s VIN. It arrives at your door ready for installation, saving you time, money, and a trip to the dealer. This isn’t just a part; it’s a complete solution designed to restore your engine’s efficiency and reliability.
Common Signs of a Failing PCM
If you’re experiencing any of the following, a faulty module could be the culprit. I’ve seen these symptoms countless times in my 20+ years in the shop, and a quality replacement PCM is often the definitive fix.
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Fault) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Failure to pass an emissions or smog test.
- ✔ Communication errors with your scan tool.
A Technician’s Notebook: The Intermittent Stall
I once had a ’98 GMC Jimmy S15 in the bay that was driving its owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. The owner had already replaced the fuel pump and ignition control module. After checking fuel pressure and spark during a no-start event (both were good), I hooked up my professional scan tool. I noticed that when the engine was hot and the fault occurred, I would lose all communication with the PCM. This is a classic sign of internal board failure, where heat causes a micro-fracture in a solder joint to expand and break the connection. We installed a VIN-programmed PCM, and the truck never had the issue again. It’s a textbook example of how a failing computer can mimic other component failures.
DIY-Friendly Installation Guide
Replacing the PCM on these GM trucks is a job most DIYers can handle in under an hour with basic hand tools. Just follow these steps carefully.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the Module: On the ’98 Blazer/Jimmy, the PCM is typically located in the engine bay on the right-hand (passenger) side, often near the firewall or inner fender. On full-size trucks and vans, it’s usually on the left-hand (driver) side.
- Disconnect the Connectors: These PCMs have several large multi-pin connectors. They have locking levers or tabs. Carefully release the locks and gently pull the connectors straight out. Never force them. Inspect the pins for any corrosion or damage.
- Remove the Old PCM: The module is held in place by a few bolts or nuts. Remove them and carefully lift the old PCM out of its mounting bracket.
- Install the New PCM: Place your new, pre-programmed PCM into the bracket and secure it with the original hardware. Reconnect the electrical harnesses, ensuring they click securely into place and the locking levers are fully engaged.
- Reconnect the Battery: Reattach the negative battery terminal and tighten it.
- Perform Security Relearn: Your vehicle is equipped with a Passlock/VATS security system. You will need to perform a simple 10-minute or 30-minute relearn procedure so the new PCM recognizes your key. This procedure involves turning the key to the ‘ON’ position and waiting for the security light to turn off. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 09366810, 16250279, and 09355699. It fits a wide range of GM vehicles. Please match your part number or vehicle from the list below to ensure compatibility. Note the specific engine and options where applicable.
- Chevrolet Astro Van: 1998-1999
- Chevrolet Blazer S10 / GMC Jimmy S15 / Oldsmobile Bravada: 1998 (w/o build date opt ZN4)
- Chevrolet/GMC C/K 1500, 2500, 3500 Pickups: 1998-1999 (Gasoline engines)
- Chevrolet/GMC Suburban 1500, 2500: 1998-1999 (Gasoline engines)
- Chevrolet Tahoe / GMC Yukon: 1998-1999 (Gasoline engines)
- Chevrolet Express / GMC Savana 1500, 2500, 3500 Vans: 1998 (Gasoline engines)
- Cadillac Escalade: 1999
- GMC Envoy: 1998 (w/o build date opt ZN4)
- Isuzu Hombre: 1998 (4.3L V6, w/o extended build date opt ZN4)
- Chevrolet S10 / GMC Sonoma: 1998 (4.3L V6, w/o build date opt ZN4)
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your vehicle’s 17-digit VIN. We use this number to access the latest official GM software for your exact vehicle configuration and flash it onto the module before shipping. This ensures it works correctly right out of the box.
Is this a simple plug-and-play installation?
Almost. The module is pre-programmed for your engine and transmission, but you will need to perform a standard security relearn procedure after installation. This is a simple process that takes 10-30 minutes and requires only your ignition key. It syncs the new PCM with your vehicle’s anti-theft system.
Do I need to send my old PCM back (core charge)?
No, there is no core charge for this part. You can keep or responsibly dispose of your old module.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also functions as the transmission control module (TCM) in these vehicles. If your shifting issues are caused by electronic faults, a new PCM is often the solution. However, it will not fix internal mechanical problems with the transmission.
How do I find my original part number?
The part number is printed on a sticker on your original PCM. You can cross-reference it with the compatible numbers listed here: 09366810, 16250279, or 09355699. However, our VIN programming makes matching the part number less critical, as we ensure the software is correct for your truck.