Restore Your GM Truck’s Brain and Get Back on the Road
Is your 1998-2000 Blazer, Jimmy, or S10 feeling sluggish, shifting erratically, or showing a persistent Check Engine Light? You’re not just dealing with an annoyance; you’re facing a failure of the vehicle’s central command center: the Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty PCM can cause a cascade of frustrating issues, from poor fuel economy to a complete no-start condition. This isn’t just a part; it’s the solution to restoring your vehicle’s reliability and performance.
This isn’t a generic, one-size-fits-all module. We provide a fully programmed PCM, flashed with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This critical step ensures that when your part arrives, it’s a true plug-and-play fix. You’ll bypass the costly trip to the dealership for programming and avoid the compatibility headaches that come with un-programmed modules. Get the precise, reliable fix your truck or SUV deserves.
A Technician’s Notebook: The Phantom Misfire
A customer brought in a 2000 GMC Jimmy with the 4.3L V6, complaining of a random misfire (P0300) that three other shops couldn’t solve. They had replaced plugs, wires, the distributor cap, and even the fuel injector spider assembly. The engine would run fine for a while, then suddenly start sputtering. After checking all the usual suspects, I hooked up my scope to the PCM outputs. I noticed the injector pulse for cylinder #3 would occasionally drop out completely. It wasn’t the wiring or the injector; the driver circuit inside the original PCM was failing intermittently under heat. We installed a VIN-programmed 1998-2000 Blazer S10 PCM, and the problem was solved instantly. It’s a classic case where the root cause is electronic, not mechanical.
Common Signs of a Failing PCM
- ✔ Check Engine Light is on with codes like P0601, P0605, or other internal processor faults.
- ✔ Your vehicle fails to start or stalls unexpectedly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine performance issues like rough idling, hesitation, or misfires.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks and SUVs is a job most DIYers can handle in their own driveway. The module is typically located in the engine bay, making access relatively simple.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most S10/Blazer/Jimmy models, it’s on the passenger side (RH) front of the engine compartment. On full-size trucks and vans, it’s often on the driver’s side (LH).
- Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs, so be gentle to avoid damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-connect the wiring harnesses. You should hear a ‘click’ as they lock in place.
- Reconnect the Battery: Re-attach the negative battery terminal. Your vehicle is now ready to start. A security relearn procedure may be required on some models, which typically involves turning the key to ‘ON’ for 10-15 minutes.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. It is guaranteed to fit a wide range of GM trucks and vans. Please confirm your model and year from the list below. Providing your VIN ensures we send the correctly programmed unit for your specific application.
Fits select models of: Chevrolet Blazer, S10, Astro, Express, Silverado, Suburban, Tahoe; GMC Jimmy, Sonoma, Safari, Savana, Sierra, Yukon; Cadillac Escalade; Oldsmobile Bravada; and Isuzu Hombre from approximately 1998-2002. It is crucial to match your original part number or provide your VIN for a perfect match.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
No! This module comes pre-programmed to your vehicle’s VIN. In most cases, it’s a simple plug-and-play installation. Some vehicles may require a security relearn procedure (Case Anti-Theft), which can be done without special tools by following simple instructions included with your part.
Is this a used part?
This is a high-quality, inspected, and tested recycled OEM part. Each unit is verified for full functionality before being programmed with the latest GM software for your specific VIN, ensuring OEM-level performance and reliability.
Where do I provide my VIN?
Please enter your 17-digit Vehicle Identification Number (VIN) in the notes section during checkout or send it to us in a message after your purchase. We cannot ship your order until we receive your VIN.
Will this fix my check engine light?
If your check engine light is caused by a faulty PCM (e.g., codes P0601-P0606), then yes, this part is the correct fix. However, it’s essential to properly diagnose your vehicle, as other failing sensors or components can also trigger a check engine light.
How is this different from one from a junkyard?
A junkyard module will not be programmed for your vehicle’s specific VIN and options, leading to running issues, feature malfunctions, or a no-start condition. Our service includes flashing the module with your vehicle’s data and the newest GM updates, making it ready for installation right out of the box.