Is Your GM Truck or Van Experiencing Critical Performance Issues?
If your late 90s or early 2000s Chevrolet, GMC, or Isuzu is suffering from erratic behavior like stalling, harsh shifting, a persistent check engine light, or a complete no-start condition, a failing Powertrain Control Module (PCM) is a very likely culprit. The PCM is the central computer of your vehicle, orchestrating everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, it can cause a cascade of frustrating and seemingly unrelated problems, leaving your reliable workhorse dead in the driveway.
The Direct-Fit Solution for Your 1998-2000 Blazer PCM
This Powertrain Control Module is a reliable, direct-fit replacement for a wide range of GM trucks and vans, including the popular S10 Blazer, S15 Jimmy, Silverado, Sierra, and Express/Savana vans. The most significant benefit of this module is that it arrives at your door pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). We handle the complex flashing process for you, loading the latest GM-certified software onto the module before it ships. This eliminates the need for expensive trips to the dealership or specialized tools, making the repair process faster and more straightforward for both DIY mechanics and professional technicians.
From the Diagnostic Bay
We had a ’99 GMC Jimmy with the 4.3L V6 come in on a tow truck. The customer said it would crank but never start, and he’d already replaced the fuel pump and ignition coil. We scanned it and got no communication with the PCM. After checking powers and grounds to the module connectors, which were all good, we knew the computer itself was the issue. A common failure on these units is an internal short in the driver circuit. We installed one of our VIN-programmed modules, performed the quick security relearn, and the Jimmy fired right up and ran perfectly. It saved the customer from chasing down more phantom issues and got his truck back on the road the same day.
Common Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light: The most common indicator, often with codes related to internal module failure, sensor circuits, or communication errors.
- ✔ No-Start Condition: The engine cranks but will not fire up due to a lack of fuel injector or ignition coil command from the PCM.
- ✔ Poor Engine Performance: You may experience rough idling, stalling, hesitation during acceleration, or a noticeable drop in power.
- ✔ Reduced Fuel Economy: An improperly functioning PCM cannot efficiently manage the engine’s fuel delivery, leading to wasted gas.
- ✔ Harsh or Erratic Shifting: The PCM also controls the automatic transmission. A faulty module can cause delayed shifts, banging into gear, or getting stuck in one gear.
- ✔ Failure to Communicate: A scan tool may be unable to connect with the PCM, indicating a complete internal failure.
Replacing your failing computer with this pre-programmed unit is the most effective way to resolve these issues and restore your vehicle’s original performance and reliability. By providing us with your VIN during checkout, you ensure that the module you receive is perfectly matched to your vehicle’s factory specifications, including engine size, transmission type, and emissions equipment.
Frequently Asked Questions
Do I need to program this module?
No. This module comes fully programmed to your vehicle’s VIN before we ship it. You just need to provide your VIN to us after purchase. This saves you a trip to the dealership and the cost of programming.
Where is the PCM located on my 1999 S10 Blazer?
On most 1998-2000 S10 Blazers, Jimmy S15s, and Sonomas, the Powertrain Control Module is located in the engine compartment on the right-hand (passenger) side, near the firewall or inner fender.
Will I need to perform any other steps after installation?
In many cases, you may need to perform a security relearn procedure (often called Passlock or VATS relearn) to allow the vehicle to start. This is a simple procedure that typically involves turning the key on and off in a specific sequence and can be done without special tools. Instructions are readily available online for your specific model.
Is this compatible with part number 16263494?
Yes, this module is a direct replacement for several original equipment part numbers, including 16263494, 16265035, and 8162634940. It is designed to function identically to the original part once programmed for your vehicle.
What happens if I don’t provide my VIN?
We cannot ship the module until we have your VIN. The programming is essential for the part to work correctly in your vehicle. Please provide your VIN promptly after your purchase to avoid delays in shipping.