Restore Your Truck’s Brainpower and Performance
Is your 1998 or 1999 Chevrolet Suburban, Tahoe, or GMC truck plagued by frustrating issues like a persistent Check Engine Light, erratic shifting, or a no-start condition that leaves you stranded? As a technician with over two decades of experience, I’ve seen these symptoms countless times. Often, the root cause isn’t a faulty sensor or bad wiring—it’s the Powertrain Control Module (PCM), the central computer managing your engine and transmission.
This isn’t just a used part pulled from a shelf. This is a dependable, OEM PCM that we meticulously program to your vehicle’s specific Vehicle Identification Number (VIN). By flashing it with the latest official GM software updates, we ensure it communicates flawlessly with your truck’s systems right out of the box. This critical step eliminates the need for an expensive trip to the dealership for programming, saving you time and money and getting your reliable GM workhorse back on the road where it belongs.
A Technician’s Notebook
I recall a ’99 Yukon that came into my bay with a complaint of random stalling and a transmission that shifted hard into second gear. The owner had already replaced the throttle position sensor and the mass airflow sensor with no improvement. After hooking up my scan tool, I found no communication with the PCM. We tested power and ground to the module—all good. It was a classic case of internal PCM failure. We installed a VIN-programmed module just like this one, performed the quick security relearn, and the truck ran like it was new again. It’s a textbook fix for these tough, reliable vehicles.
Common Signs of a Failing GM PCM
A failing computer can cause a wide range of problems that can be mistaken for other issues. If you’re experiencing any of the following, your PCM is a likely suspect:
- ✔ Check Engine Light is on with communication error codes (like U0100) or internal module failure codes (P0601, P0602, P0605).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ The transmission shifts harshly, gets stuck in one gear, or shifts at the wrong times.
- ✔ Noticeable loss of engine power or rough idling.
- ✔ Your scan tool cannot communicate with the computer.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle in their own driveway with basic hand tools. Our pre-programming makes it even simpler.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
- Locate the PCM: On most of these trucks and vans (like the Suburban, Tahoe, and pickups), you’ll find the PCM in the engine compartment on the driver’s side, near the fender or firewall.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. The levers can be stiff, so be gentle to avoid damaging them.
- Swap the Modules: Unbolt the old PCM from its mounting bracket and set it aside. Mount your new, pre-programmed PCM in its place.
- Reconnect Everything: Firmly plug the harness connectors into the new module until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn (If Required): In some cases, you may need to perform a simple security relearn procedure so the vehicle recognizes the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service information for the exact steps.
Verified Vehicle Compatibility
This module is a direct replacement for service number 16266645 and is compatible with other part numbers such as 09355699, 16250279, 16258815, and 09366810. It fits a wide range of GM vehicles. Please verify your vehicle is on this list and that your original module carries one of the compatible part numbers.
- Cadillac Escalade: 1999
- Chevrolet/GMC Pickups (1500, 2500, 3500): 1998-1999 (Gasoline)
- Chevrolet/GMC Suburban (1500, 2500): 1998-1999 (Gasoline)
- Chevrolet Tahoe / GMC Yukon: 1998-1999 (Gasoline)
- Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 1998-1999 (Gasoline)
- Chevrolet Astro / GMC Safari: 1998
- Chevrolet S10 / GMC Sonoma: 1998 (4.3L)
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada: 1998 (4.3L)
- GMC Envoy: 1998
- Isuzu Hombre: 1998 (4.3L)
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your truck was built with. This ensures proper engine, transmission, and emissions control, making the installation process as smooth as possible.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. Each unit is inspected and then programmed to your VIN to ensure full functionality and reliability, offering a dependable fix at a great value.
Will I need to do a security relearn procedure?
It’s possible. Many GM vehicles of this era use a Passlock or Passkey security system that may need to be synchronized with the new PCM. The procedure is simple and typically involves leaving the ignition key in the ‘ON’ position for about 10-15 minutes. No special tools are required.
Is this part difficult to install for a DIYer?
Not at all. With basic hand tools and our pre-programming service, this is a very straightforward job. The most important parts are safely disconnecting the battery and carefully handling the electrical connectors. Most customers complete the swap in under an hour.
How can I be sure the PCM is my problem?
While the symptoms listed are very common for PCM failure, it’s always best to have a proper diagnosis performed. Key indicators are internal fault codes (like P0601), a no-communication status with a scan tool, or having ruled out all other potential causes like sensors, wiring, and fuel delivery.