Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Chevrolet, GMC, or Cadillac truck suffering from erratic behavior? Issues like stalling, poor fuel economy, harsh shifting, or a persistent check engine light can often be traced back to a failing Powertrain Control Module (PCM), the central computer of your vehicle. This genuine, used OEM PCM, part number 9366810, is the reliable and cost-effective solution to get your vehicle running smoothly again. It serves as the brain for your engine and transmission, precisely managing fuel delivery, ignition timing, and shift points to ensure optimal power, efficiency, and emissions control.
From the Diagnostic Bay
We had a 1999 GMC Yukon come into the shop with a complaint of intermittent stalling and a check engine light that previous shops couldn’t solve. They had replaced the fuel pump, crank sensor, and multiple O2 sensors. After hooking up our professional scan tool, we noticed the data stream for the throttle position sensor was dropping out, but the sensor itself tested fine. The issue was internal to the PCM; the driver circuit for that sensor was failing. We installed one of these VIN-programmed modules, performed the security relearn, and the Yukon ran like new. It’s a classic case where throwing parts at a problem costs more than correctly diagnosing a faulty computer.
Your Direct Replacement 1998-1999 Chevrolet 2500 PCM
Don’t let a faulty engine computer keep you off the road. This unit is a direct-fit replacement for a wide range of GM vehicles from that era. We take the guesswork out of the repair by programming the module specifically for your vehicle using the VIN you provide. This process loads the correct factory software and the latest GM updates, ensuring that the computer is ready for installation right out of the box. This eliminates the need for expensive trips to the dealership for programming.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light with communication or sensor circuit codes.
- ✔ Unexplained drops in fuel economy.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start (no-start condition).
- ✔ Failure to pass state emissions testing.
- ✔ Seemingly unrelated electrical issues or warning lights.
This module is a tested, functional component sourced from a salvaged vehicle. By choosing this part, you are getting an original factory component designed for your truck’s specific needs. Simply provide us with your vehicle’s 17-digit VIN upon purchase, and our technicians will handle the programming, ensuring a seamless installation process.
Compatible Part Numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810
Frequently Asked Questions
Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) contains critical information about your truck’s engine, transmission, emissions systems, and other options. We use the VIN to load the exact, correct GM factory software onto the PCM, ensuring it communicates perfectly with your vehicle’s systems upon installation.
Is any additional programming required after I install it?
No dealership programming is needed. The module arrives flashed and ready to go. However, on most 1998-1999 GM vehicles, you will need to perform a simple security relearn procedure (often called a CASE relearn or Passlock relearn) which can typically be done in your driveway with just the ignition key. This procedure syncs the new PCM to your vehicle’s anti-theft system.
Is this a new computer?
No, this is a high-quality, used OEM (Original Equipment Manufacturer) computer that has been carefully removed from a salvaged vehicle and thoroughly tested to ensure full functionality. It is then programmed to your specific vehicle.
How do I know for sure that my PCM is the problem?
While the symptoms listed are common indicators of PCM failure, it’s essential to perform a proper diagnosis. This includes checking all power and ground connections to the PCM, testing relevant sensors, and using a scan tool to check for communication codes (U-codes). If all other components in a failing circuit test good, the PCM is the likely culprit.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. For most vehicles like yours, the PCM is a single unit that controls both the engine and the automatic transmission, making it the more accurate term.