Restore Your Truck’s Heartbeat and Drive with Confidence
Is your reliable GMC 1500 suddenly acting up? A persistent check engine light, rough idling, hesitation, or strange shifting behavior can be incredibly frustrating. These aren’t just annoyances; they’re signs that your truck’s brain—the Powertrain Control Module (PCM)—may be failing. This isn’t just a part; it’s the central command unit for your engine and transmission. When it falters, the entire vehicle suffers. Our pre-programmed PCM is the definitive solution, designed to restore the crisp performance and unwavering reliability you depend on, getting you back on the road with peace of mind.
Warning Signs and How to Overcome Them
A failing PCM can manifest in numerous ways, often mimicking other mechanical issues. Here’s what to look for and how this module provides the solution:
- ✔ Erratic Engine Performance: Solves issues like stalling, misfiring (DTC P0300-P0308), and poor acceleration by restoring precise fuel and spark control.
- ✔ Poor Fuel Economy: By correcting air/fuel mixture calculations, it helps you regain the MPG your truck was designed for, saving you money at the pump.
- ✔ Harsh or Failed Shifting: Eliminates communication errors with the transmission, correcting hard shifts, slipping, or failure to shift (DTCs P0700, P0753, etc.).
- ✔ Persistent Check Engine Light: Clears stubborn codes related to module communication, lean/rich conditions (P0171, P0174), or catalyst inefficiency (P0420) that other repairs can’t fix.
- ✔ No-Start or Intermittent Start: A dead PCM can prevent the engine from starting at all. This module restores the critical signals needed for ignition and fuel delivery.
An Expert’s Diagnostic Tale
“I once had a ’99 Suburban in the shop that had been to three other mechanics for a random misfire and harsh 1-2 shift. They had replaced plugs, wires, injectors, and even the transmission solenoids. The problem persisted. The owner was at his wit’s end. I hooked up my scope and saw the injector pulse width was all over the place, a classic sign of a struggling processor in the PCM. We installed a VIN-programmed module just like this one, performed the security relearn, and it ran like it just rolled off the assembly line. It’s a powerful reminder that sometimes the ‘brain’ is the simplest, most direct solution to a complex problem.”
Guided Installation for a 1998-1999 GMC 1500 PCM
Replacing the PCM on these classic GM trucks is a straightforward job you can tackle with basic hand tools. Our module is programmed to your VIN, making the process as close to plug-and-play as possible. Follow these steps for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental power surges.
- Locate the Old Module: On most 1998-1999 GMC/Chevy trucks, the PCM is located in the engine bay, on the driver’s side, near the fender or firewall. It’s a silver metal box with several large wire harness connectors.
- Disconnect the Harnesses: Carefully unplug all electrical connectors from the old PCM. These connectors have locking tabs that may need to be squeezed or lifted to release. Avoid pulling on the wires themselves.
- Remove the Old PCM: Unbolt the mounting bracket holding the old module in place. Once the bolts are removed, the old PCM will be free.
- Install the New Module: Seat your new, pre-programmed PCM into the mounting bracket and secure it with the bolts. Do not overtighten.
- Reconnect Everything: Firmly plug the wire harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): Your truck may require a simple security relearn procedure. Typically, this involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your truck should then start normally.
Tailored Fit for Your Ride
This module is a direct replacement for service number 09355699 and is also compatible with 16250279 and 09366810. It is guaranteed to fit the following vehicles:
- 1999 Cadillac Escalade
- 1998-1999 Chevrolet/GMC 1500, 2500, 3500 Pickups (Gasoline)
- 1998-1999 Chevrolet/GMC Suburban 1500 & 2500 (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- 1998-1999 Chevrolet Express & GMC Savana Vans (1500/2500/3500, Gasoline)
- 1998-1999 Chevrolet Astro & GMC Safari
- 1998 Chevrolet S10/Blazer & GMC Sonoma/Jimmy (4.3L)
- 1998 Oldsmobile Bravada (4.3L)
- 1998 Isuzu Hombre (4.3L)
- 1998 GMC Envoy
Note: After purchase, please provide your VIN. This is essential for us to load the correct, updated software for your specific vehicle configuration, ensuring a seamless installation.
Do I need to do anything after installing this PCM?
Because we program the module to your vehicle’s VIN, it is ready for installation. However, you will need to perform a security relearn procedure, often called a CASE relearn or Passlock relearn. This simple process syncs the new PCM with your vehicle’s anti-theft system and can be done without special tools.
Is this a brand new part?
This is a professionally reconditioned original equipment (OE) unit. Each module undergoes rigorous testing and is restored to meet or exceed factory specifications. We then flash it with the latest GM-certified software for your VIN, ensuring optimal performance and longevity.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both the engine and the transmission. Communication failures or faulty logic within the module are common causes of erratic shifting, slipping, and other transmission issues. Replacing a faulty PCM often resolves these problems without needing costly transmission work.
What does ‘VIN Programmed’ mean for me?
It means convenience and accuracy. By programming the module with your vehicle’s unique VIN, we ensure it has the correct software for your engine size, transmission type, and other factory options. This eliminates compatibility issues and makes the installation process much smoother for you.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as it’s crucial for the programming process.