Restore Peak Performance to Your GM Truck or Van
Is your trusty 1998-1999 Chevrolet 1500 Pickup running rough, shifting erratically, or refusing to start? A failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM manages everything from fuel mixture and ignition timing to transmission shift points. When it fails, it can cause a cascade of frustrating and hard-to-diagnose problems. This isn’t just a replacement part; it’s a direct solution, delivered ready to install.
We take the guesswork and expense out of the repair. Unlike a generic module from a parts store, this PCM is professionally flashed with the latest official GM software updates specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our experts will program the module. This ensures it communicates perfectly with your truck’s systems right out of the box, restoring the performance and reliability you depend on.
A Technician’s Notebook: The Intermittent Gremlin
I once had a ’98 Suburban in the bay with a problem that was driving the owner crazy. It would run perfectly for days, then suddenly start stumbling and stalling at idle. No consistent codes, just random misfires that would disappear. We checked fuel pressure, ignition components, everything. On a hunch, I tapped the PCM with a screwdriver handle while the engine was running, and it stalled instantly. The culprit was a hairline crack in a solder joint on the main board, causing an intermittent connection. A replacement, programmed PCM like this one solved the issue permanently. Sometimes, the simplest fix is the right one.
Is Your Truck Showing These Telltale Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention. A faulty 1999 Chevy 1500 PCM can be the root cause of many headaches.
- ✔ Check Engine Light is on with codes like P0601, P0605, or other communication errors.
- ✔ Engine cranks but refuses to start.
- ✔ Rough or unstable idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ The vehicle stalls for no apparent reason.
- ✔ Failure to pass an emissions test.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle with basic tools. Our pre-programming service eliminates the most difficult step, so you can get back on the road without a trip to the dealer.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system to fully discharge.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender or near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old module. They are color-coded and keyed, so you can’t mix them up.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into the bracket.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click. Reconnect your vehicle’s battery.
- Final Step: Turn the key to the ‘On’ position (without starting) for 10-15 seconds, then turn it off. This allows the system to recognize the new module. Your truck is now ready to start.
Verified Fitment For These GM Models
This module is a direct replacement for service number 09355699 and is also compatible with part numbers 16250279 and 09366810. It fits a wide range of popular GM vehicles. Please match your vehicle and options below to ensure compatibility.
- ✔ 1998-1999 Chevrolet & GMC 1500/2500/3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- ✔ 1998-1999 Chevrolet & GMC Suburban (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Astro & GMC Safari Vans
- ✔ 1998 Chevrolet Express & GMC Savana 1500/2500/3500 Vans (Gasoline)
- ✔ 1998 Chevrolet S10 Blazer, GMC S15 Jimmy, Oldsmobile Bravada, GMC Envoy (4.3L V6)
- ✔ 1998 Chevrolet S10/S15 Sonoma & Isuzu Hombre (4.3L V6)
Note: For 1998 S-series/mid-size models, please verify your vehicle does not have build date option ZN4.
Do I need to do anything after I install this PCM?
Do I need to do anything after I install this PCM?
No! Because we program the module to your VIN before shipping, it is a true plug-and-play installation. No dealer visit or special tools are required. In some cases, a security relearn procedure may be needed, which can be done without tools and takes about 30 minutes. Instructions are readily available online or can be provided.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit serial number. You can find it on a metal plate on the driver’s side of the dashboard (visible through the windshield), on your vehicle’s registration, or on your insurance card.
Will this fix my hard shifting transmission?
In many cases, yes. The PCM controls the transmission’s electronic solenoids and shift logic. If the module is failing, it can cause erratic shifting, delayed engagement, or harshness. Replacing a faulty 1999 Chevy 1500 PCM often resolves these powertrain communication issues.
My original part number is 16250279. Will this work?
Yes, absolutely. This module is a fully compatible replacement for part numbers 16250279, 09366810, and 09355699. We program it to function identically for your specific vehicle based on your VIN.
How long does the programming process take?
We program and ship your module promptly, typically within 1-2 business days of receiving your VIN. Our goal is to get your truck back on the road as quickly as possible.