Restore Your Truck’s Brain and Brawn
Is your dependable 1998-1999 Chevrolet 2500 Pickup suddenly giving you headaches? Unexplained stalling, a persistent check engine light, or erratic transmission shifting can sideline even the toughest truck. Often, the culprit isn’t a major mechanical failure but a faulty Powertrain Control Module (PCM)—the central computer that manages everything from fuel injection to gear changes. This replacement PCM, part number 09355699, is the definitive solution to get your workhorse running reliably again.
Unlike generic modules from a parts store, this unit arrives at your door fully programmed to your truck’s specific Vehicle Identification Number (VIN). We flash it with the latest official GM software updates, which often correct drivability issues and improve performance beyond the original factory settings. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix for the competent DIYer or professional technician.
Case Study: The Ghost in the Machine
A few months back, a customer brought in his ’99 Silverado 2500 with a 5.7L. The truck would randomly die at stoplights and had a harsh 1-2 shift. He’d already replaced the fuel pump and a handful of sensors with no luck. The scanner showed a mix of communication codes (U-codes) and a P0601 (Internal Control Module Memory Check Sum Error). In my 20+ years of diagnostics, this combination almost always points to a failing PCM. The internal processors were failing, causing phantom signals and commands. We installed one of our VIN-programmed modules, performed a quick security relearn, and the truck ran perfectly. It’s a classic example of how a single component can mimic a dozen other problems.
Is Your Truck Showing These Symptoms?
A failing PCM can cause a wide range of frustrating issues. If you’re experiencing any of the following, this module is likely the solution you need.
- ✔ Check Engine Light is on with codes like P0601, P0602, or other communication errors.
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy for no apparent reason.
- ✔ Intermittent stalling or engine stumbling while driving.
- ✔ Failure to pass state emissions testing.
- ✔ Inconsistent or non-functioning gauges on the instrument cluster.
The Advantage of a Pre-Programmed 1998-1999 Chevrolet 2500 Pickup PCM
Ordering this module is the most efficient way to solve your truck’s electronic issues. We handle the complex part for you. Simply provide us with your vehicle’s VIN during checkout, and our technicians will load the correct, updated GM calibration file onto the module. This ensures that it communicates flawlessly with your engine, transmission, and all other onboard systems right out of the box. You’re not just getting a replacement part; you’re getting a reliable, fully integrated solution that restores your vehicle’s factory performance and dependability.
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. Follow these steps carefully to ensure a smooth process.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most 1998-1999 Chevy/GMC trucks, the PCM is located in the engine bay on the driver’s side, near the firewall or inner fender.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old module. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need it for the new installation.
- Install the New PCM: Mount your new, pre-programmed module onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical harnesses into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: You may need to perform a simple security or anti-theft relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual or a reliable online resource for the specific steps for your truck.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 09355699, 16250279, and 09366810. It is guaranteed to fit the following gasoline-engine GM vehicles, provided the ID on your original module matches:
- ✔ 1998-1999 Chevrolet/GMC 1500, 2500, & 3500 Pickups
- ✔ 1998-1999 Chevrolet/GMC Suburban 1500 & 2500
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans
- ✔ 1998-1999 Chevrolet Astro & GMC Safari Vans
- ✔ 1998 Chevrolet S10 / GMC Sonoma / Isuzu Hombre (4.3L)
- ✔ 1998 Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada
Note: Always match your original part number or the ID 16250279 or 16258815 to ensure perfect fitment. Please provide your VIN upon purchase for programming.
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you’ll provide us with your 17-digit VIN. Our technicians use this number to access the latest GM database and flash the module with the exact software calibration your truck needs. This ensures perfect compatibility and performance.
Is this a simple plug-and-play installation?
Yes, for the most part. Because we program it to your VIN, you will not need a dealership scan tool for programming. However, on these GM vehicles, you will almost always need to perform a simple ‘Security Relearn’ procedure, which can be done without any special tools.
Will this fix my transmission shifting problems?
If the shifting problems are caused by the PCM, then yes. The PCM controls transmission line pressure and shift points. A faulty module is a very common cause of harsh or erratic shifting in these trucks, and this replacement part is designed to correct that.
Do I need to send my old PCM back?
This listing does not require a core return. You can keep your old module, though we always recommend recycling old electronics responsibly.
What is the warranty on this part?
This module comes with our standard warranty, guaranteeing it to be free from defects in materials and workmanship. Please see our warranty page for full details and duration.
The part number on my module is 16250279. Will this work?
Absolutely. This PCM is a direct, compatible replacement for several part numbers, including 16250279, 09366810, and 09355699. As long as you have one of these numbers, this module will work perfectly once programmed for your vehicle.