Restore Peak Performance to Your GM Truck or SUV
Is your 1998-2000 Chevy Blazer, GMC Jimmy, or S10 suffering from frustrating issues like a persistent Check Engine Light, erratic idling, stalling, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as your vehicle’s brain. A faulty PCM can disrupt everything from fuel delivery and spark timing to transmission shifting. This replacement PCM is the reliable, straightforward solution to bring your truck back to life.
We take the guesswork and extra cost out of the repair. Unlike getting a module from a junkyard or parts store, this unit arrives at your door fully programmed with the latest official GM software updates. All we need is your vehicle’s 17-digit VIN during checkout. This ensures the module is a perfect match for your engine, transmission, and factory options, making installation a true plug-and-play process. Get your 1998-2000 Blazer S10 PCM and restore the smooth, dependable operation you expect from your vehicle.
From the Diagnostic Bay: The Case of the Confused Jimmy
A few months back, a 1999 GMC Jimmy S15 was towed to my shop with a confusing set of symptoms. The owner complained of intermittent stalling at red lights and harsh, unpredictable transmission shifts. He’d already replaced the fuel filter and spark plugs with no luck. My initial scan showed no hard codes, just a history of lost communication faults (U-codes). After verifying solid power and ground connections to the PCM—a critical first step I always perform—I hooked up my scope. The 5-volt reference signal was fluctuating wildly. This told me the internal voltage regulator in the original PCM was failing. We installed one of these VIN-programmed modules, performed the quick security relearn, and the Jimmy ran like it just rolled off the factory floor. The problem wasn’t a dozen different sensors; it was the one computer controlling them all.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) illuminated on your dash.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling, especially when coming to a stop or at idle.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine runs rough, misfires, or hesitates during acceleration.
- ✔ Diagnostic trouble codes (DTCs) are present, such as P0601, P0605 (Internal Module Failure), or various communication errors.
A Straightforward Guide to Installation
Replacing the 1998-2000 Blazer S10 PCM is a job most DIYers can handle with basic tools. Since we program it beforehand, you won’t need a trip to the dealership. Follow these general steps for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most S10/Blazer/Jimmy models, the PCM is located in the engine bay on the passenger’s side (RH front). For vans and full-size trucks, it may be on the driver’s side or near the battery. Consult your owner’s manual if you’re unsure.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs that need to be released before pulling. Never force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure (often called PASSLOCK or Passkey). This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. This syncs the new PCM with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is confirmed to fit a wide range of GM vehicles. Please verify your model and year from the list below. Providing your VIN is essential to guarantee a perfect match.
CHEVROLET/GMC ASTRO/SAFARI (99-01)
CHEVROLET/GMC 1500/2500/3500 PICKUPS (99-00)
CHEVROLET/GMC SILVERADO/SIERRA 1500 (99-00)
CHEVROLET/GMC EXPRESS/SAVANA VANS (99-02)
CHEVROLET/GMC SUBURBAN (99)
CHEVROLET/GMC TAHOE/YUKON (99-00)
OLDSMOBILE BRAVADA (98-00)
GMC ENVOY (98-00)
CADILLAC ESCALADE (99-00)
ISUZU HOMBRE (98-00)
Note: Some 1998 models require build date option ZN4. Please check your vehicle’s service parts sticker.
Frequently Asked Questions
Do I need to do any programming after I receive this module?
No. We program the module with your vehicle’s specific VIN before shipping. It arrives ready for installation. You may need to perform a simple security relearn procedure, which requires no special tools.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) is located on a tag on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
What happens if I don’t provide my VIN?
Providing your VIN is required for this purchase. We cannot program or ship the module without it, as the software is specific to each vehicle. This step ensures compatibility and proper function.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (e.g., code P0601), then yes, this part will resolve the issue. However, you should always ensure that the root cause of the problem is the PCM and not a faulty sensor or wiring issue.
Is this a brand new part?
This is a high-quality, tested replacement part that has been professionally prepared and programmed to meet or exceed original factory specifications. It is guaranteed to restore your vehicle’s functionality.