Get Your Truck Back on the Road with a Reliable, Programmed PCM
Is your 1998-1999 GMC 1500 Pickup giving you headaches? If you’re dealing with frustrating issues like stalling, no-start conditions, erratic shifting, or a persistent check engine light that just won’t go away, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your truck, when the PCM starts to fail, it can cause a cascade of confusing and costly problems. This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. We offer a dependable and affordable solution: a tested, used OEM PCM that comes programmed specifically for your vehicle.
Case Study: A Tricky Diagnosis
I remember a ’99 Sierra that came into my shop a few years back. The owner was at his wit’s end. It would randomly stall at stoplights, the transmission would slam into gear, and he had a handful of seemingly unrelated trouble codes. He’d already replaced the throttle position sensor and the mass air flow sensor with no luck. After hooking up my high-end scan tool, I noticed the data stream from the PCM would intermittently drop out completely. That’s a classic sign of internal failure. We swapped in a pre-programmed PCM just like this one, and it was like a new truck. All the ghost-in-the-machine problems vanished. It’s a reminder that sometimes, the most complex symptoms point back to a single faulty component: the brain.
What Problems Does a Failing PCM Cause?
A faulty engine computer can manifest in many ways. As a technician, I’ve seen it all. If your truck is experiencing any of the following, it’s a strong indicator that you need a replacement 1998-1999 GMC 1500 PCM.
- ✔ Check Engine Light is on with codes for internal module failure (e.g., P0601, P0605, P0606).
- ✔ Vehicle refuses to start or stalls intermittently for no apparent reason.
- ✔ Poor fuel economy and engine performance.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ No communication with your OBD-II scan tool.
- ✔ Failure of one or more fuel injectors or ignition coils to fire.
A Straightforward Guide to Installation
One of the biggest benefits of our service is that this PCM arrives ready to install. No need for a trip to the dealership for expensive programming. You can do this right in your driveway.
- Safety First: Always disconnect the negative terminal from your truck’s battery before working on any electronic components.
- Locate the PCM: On most 98-99 GM trucks, the PCM is located in the engine compartment, typically on the driver’s side (LH) fender well or near the firewall.
- Disconnect the Old Unit: Carefully unplug the electrical harness connectors. They have locking tabs that need to be released. Note the color-coding of the connectors if present.
- Swap the Modules: Unbolt the old PCM from its bracket and set it aside. Mount your new, pre-programmed PCM in its place.
- Reconnect Everything: Firmly plug the harness connectors into the new PCM until they click into place. Reconnect your negative battery terminal.
- Final Steps: In some cases, a security relearn procedure may be required. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes. Turn the key off, then start the vehicle. Your truck is now ready to go!
Guaranteed Vehicle Compatibility
This OEM module, identified by part number 09355699, is a direct fit for a wide range of General Motors vehicles. We verify compatibility using your VIN, but please check the list below to ensure your model is included. This module interchanges with part numbers 16266645, 16250279, 16258815, and 09366810.
This 1998-1999 GMC 1500 PCM fits the following vehicles (and more):
- ✔ 1998-1999 Chevrolet & GMC 1500/2500/3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- ✔ 1998-1999 Chevrolet & GMC Suburban (Gasoline)
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Oldsmobile Bravada, GMC Envoy, S10/S15/Sonoma, Blazer/Jimmy (4.3L)
- ✔ 1998 Isuzu Hombre (4.3L)
Frequently Asked Questions
Why does this part need my VIN?
Your Vehicle Identification Number (VIN) contains critical information about your truck’s specific options, engine, transmission, and emissions. We use your VIN to load the exact GM-certified software onto the PCM, ensuring it works perfectly with your vehicle right out of the box.
Is this a used part?
Yes, this is a thoroughly tested, genuine OEM part recovered from a salvaged vehicle. This provides the reliability of an original factory component at a fraction of the cost of a new one from a dealer.
Will I have to do any additional programming?
No. The unit arrives programmed and ready for installation. In rare cases, a simple key-cycle security relearn may be needed, but no special tools or dealer visits are required.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your part until we receive this information.
What if my part number doesn’t match exactly?
This module (ID 09355699) is a direct replacement for several part numbers, including 16266645, 16250279, and others listed. As long as your vehicle is on the compatibility list, this unit will function correctly once programmed to your VIN.