Is Your 1998-1999 Chevy Truck Experiencing Engine Problems?
If your Chevrolet 2500 Pickup is stalling, running rough, shifting erratically, or simply won’t start, a failing Powertrain Control Module (PCM) could be the culprit. The PCM is the central computer of your truck, managing everything from fuel injection and spark timing to transmission shifting and emissions controls. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose issues, often leaving you stranded with a check engine light glaring from the dashboard.
From the Diagnostic Bay
We had a 1999 Suburban come into the shop that had its owner chasing ghosts for weeks. The truck would randomly stall at stoplights and had a persistent P0300 (Random Misfire) code. The owner had already replaced the spark plugs, wires, cap, and rotor. He even replaced the fuel pump. The problem persisted. After hooking up our diagnostic scanner and monitoring live data, we noticed the fuel trim and ignition timing values were jumping erratically just before a stall. This pointed us away from the mechanical parts and straight to the brain – the PCM. A quick swap with one of our programmed modules confirmed the diagnosis. The new PCM stabilized all the readings, the misfire code vanished, and the truck ran perfectly. It’s a classic case where the symptoms point everywhere, but the root cause lies within the vehicle’s central computer.
Common Symptoms of a Failing GM PCM
- ✔ Check Engine Light is on with various trouble codes (DTCs)
- ✔ Engine cranks but refuses to start
- ✔ Rough idling, stalling, or hesitation during acceleration
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ Intermittent issues that are difficult to replicate
The Direct-Fit Solution for Your Truck
Don’t let a faulty computer keep your reliable GM truck off the road. This is a tested, genuine OEM Powertrain Control Module that offers a reliable and cost-effective solution. The real value is in our service: we flash the module with the latest GM-certified software updates and program it specifically to your truck’s Vehicle Identification Number (VIN) before it ships. This critical step ensures that the computer communicates perfectly with your truck’s specific engine, transmission, and options package, making the installation process as simple as possible.
Why a VIN-Programmed 1998-1999 Chevy 2500 PCM is Essential
Installing a generic, non-programmed module from a salvage yard will almost certainly result in a no-start condition due to the vehicle’s anti-theft system (PassLock/VATS). Our pre-programming service handles the complex part for you. By matching the software to your VIN, we ensure the module is ready to integrate with your vehicle’s systems. While the physical installation is straightforward, please be aware that a security relearn procedure and a Crankshaft Variation Relearn (CASE relearn) may be necessary after installation for optimal performance. This can often be done without special tools, and procedures are widely available online.
This module is a direct replacement for part number 16250279 and is also compatible with a wide range of other service numbers, including 09355699, 16266645, 9355699, 16258815, and 09366810. It fits a huge variety of 1998-1999 GM trucks, vans, and SUVs, such as the Chevrolet and GMC 1500/2500/3500 Pickups, Suburban, Tahoe, Yukon, Express, Savana, and more. Please verify your part number or consult the detailed fitment list to confirm compatibility.
Frequently Asked Questions
Do I need to program this computer?
No. We handle the programming for you. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the correct software for your specific vehicle before we ship it.
Is this a plug-and-play installation?
Mostly, yes. Because we program it to your VIN, it will be ready to communicate with your truck. However, on these GM vehicles, you will likely need to perform a simple security relearn procedure to sync the module with your keys. A CASE (Crankshaft Position System Variation) relearn may also be required, which can sometimes be done without a scan tool.
Where is the PCM located on my truck?
On most 1998-1999 GM trucks and SUVs like the Chevy 2500, Tahoe, and Suburban, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
What happens if I don’t provide my VIN?
We cannot ship the module without your VIN. The programming is essential for the part to function correctly in your vehicle. We will hold your order and contact you to get the VIN before proceeding.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. This ensures OEM-level fit and reliability without the high cost of a new module from the dealer.