Is Your Chevy 2500 Running Rough?
If your 1998-1999 Chevrolet 2500 pickup is experiencing frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your truck’s engine and transmission, a faulty PCM can cause a wide range of problems that can be difficult to diagnose. Don’t let a bad module keep your reliable Chevy off the road. This replacement PCM is the definitive solution to restore your truck’s performance and reliability.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling or cutting out unexpectedly
- ✔ Rough or unstable idling
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel mileage
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass emissions testing
The Direct-Fit Solution: Your 1998-1999 Chevrolet 2500 PCM
This isn’t just a generic part off a shelf. This is a complete, ready-to-install solution for your truck. We take the guesswork out of the repair by pre-programming this Powertrain Control Module specifically for your vehicle using your VIN. This critical step ensures that the module has the correct factory software and calibrations for your truck’s engine, transmission, and options. We flash it with the latest updates available from GM, which can often resolve factory bugs and improve overall performance and drivability. When you receive the part, it’s ready for installation and a simple security relearn procedure.
Installation and Post-Install Procedures
Physically installing the module is straightforward. It is typically located in the engine bay on the driver’s side. Disconnect the negative battery terminal, unplug the wiring harnesses from the old PCM, unbolt it, and then install the new module in its place. After connecting the new PCM and reconnecting the battery, you MUST perform a Security Relearn Procedure (also known as Passlock Relearn) for the engine to start. This procedure syncs the new PCM with your vehicle’s anti-theft system.
Standard Security Relearn Procedure:
- Insert the key and turn it to the “ON” position (do not start the engine).
- Observe the “Security” or lock icon light on the dashboard. It will be flashing or solid.
- Leave the key in the “ON” position for approximately 10-11 minutes, until the security light turns off or stops flashing.
- Turn the key to the “OFF” position for 10 seconds.
- Repeat steps 1-4 two more times for a total of three 10-minute cycles.
- After the third cycle, the vehicle should start and run normally.
In some cases, a CASE (Crankshaft Angle Sensor Error) Relearn may be required using a capable scan tool to clear specific DTCs and ensure optimal ignition timing, but the security relearn is the essential first step.
Guaranteed Compatibility
This module is a direct replacement for service numbers 09355699, 16250279, and 09366810. By providing your VIN during checkout, we guarantee that the module you receive will be 100% compatible with your 1998-1999 Chevrolet 2500 Pickup and many other GM trucks and vans from that era. Please see the detailed fitment list for other compatible models.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We handle all the programming for you before shipment. We use your vehicle’s VIN to load the correct GM-certified software and calibrations, making it ready for installation right out of the box.
What is the security relearn procedure?
It’s a simple procedure you can do yourself to sync the new PCM to your truck’s anti-theft system. It involves a series of key-on/key-off cycles, typically taking about 30 minutes. Your truck will not start until this is completed. Instructions are provided above.
Is this part truly plug-and-play?
It is pre-programmed for your vehicle, so it’s very close. You can plug it in, but you must perform the security relearn procedure before the engine will run. This is a mandatory step for all replacement PCMs on these vehicles.
How do I provide my VIN number?
You can add your vehicle’s 17-digit VIN to the notes section during checkout. If you forget, we will contact you via email after your purchase to request it. We cannot ship your part until we have your VIN.
What if my original part number is not on your list?
The listed part numbers (09355699, 16250279, 09366810) are the most common, but GM used many different numbers. As long as your vehicle is on the compatibility list, our VIN programming ensures you get the correct module. If you are unsure, please contact us with your VIN before ordering.