Is Your GM Truck or Van Running Rough?
If your late-90s Chevrolet, GMC, or Isuzu is suffering from mysterious engine problems like stalling, erratic shifting, poor fuel economy, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) could be the culprit. As the central computer for your engine and transmission, a faulty PCM can cause a cascade of frustrating issues that are often difficult to diagnose. This replacement PCM, part number 9366810, is the reliable solution to restore your vehicle’s performance and drivability.
From the Diagnostic Bay
We had a 1999 Chevy Tahoe in the shop that was driving the owner crazy. It would randomly stall at stoplights and had a rough, hunting idle. He had already replaced the spark plugs, wires, and even the fuel pump, with no improvement. After hooking up our scanner, we noticed intermittent communication drops with the PCM. Instead of chasing more sensors, we swapped in a known-good, correctly programmed module. The truck immediately smoothed out and the stalling issue was gone. It’s a classic case where the “brain” was the problem, not the parts it was controlling.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or inconsistent idle.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to communicate with a diagnostic scan tool.
The Solution: A VIN-Programmed 1998 S10 PCM
Don’t let a bad computer keep your reliable truck off the road. This is a tested, used PCM that is a direct replacement for a wide range of GM vehicles. The most critical part of the replacement process is the programming, and we handle that for you. Before we ship your part, our technicians will flash it with the latest official GM software updates specific to your vehicle’s Vehicle Identification Number (VIN). This ensures seamless integration, correct engine and transmission parameters, and proper function of all related systems. It’s a plug-and-play solution designed to get you back on the road quickly and affordably.
This module is a direct replacement for several part numbers, including: 09355699, 16266645, 9355699, 16250279, 16258815, and 09366810. It fits dozens of models from 1998-1999, including the Chevrolet S10, Blazer, Tahoe, Suburban, Express Van, and GMC Sonoma, Jimmy, Yukon, Savana Van, and more. Please verify your original part number to ensure compatibility.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission function, including fuel injection, ignition timing, emissions systems, and shift points, to ensure optimal performance and efficiency.
Is this PCM ready to install when I receive it?
Yes! This module is pre-programmed to your vehicle’s specific VIN before shipping. This means it is ready for installation upon arrival. In some cases, a security relearn procedure may be necessary, which can typically be done without special tools.
Where do I find my vehicle’s VIN?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on the driver’s side of the dashboard visible through the windshield. Please provide this number to us after purchase.
How can I be sure my old PCM is the problem?
While the symptoms listed are common indicators of PCM failure, it’s always best to have a proper diagnosis performed by a qualified mechanic. Key indicators are communication errors with a scan tool or having ruled out all other possible sensor or wiring failures.
Will this part fit other vehicles besides the 1998 S10?
Absolutely. This PCM fits a very wide range of 1998-1999 GM trucks, vans, and SUVs. Please check the extensive fitment list and match your original part number to one of the compatible numbers listed (e.g., 09355699) to confirm it is the correct part for your vehicle.