Get Your Truck Back on the Road with a Reliable, Programmed PCM
Is your 1998-1999 GMC Yukon, Tahoe, or Suburban acting up? Dealing with a frustrating no-start condition, erratic shifting, or a persistent Check Engine Light can bring your day to a halt. As a technician with over two decades of experience, I’ve seen countless GMT400 platform trucks sidelined by a failing Powertrain Control Module (PCM). This isn’t just a part; it’s the brain of your vehicle, and when it falters, everything from fuel delivery to transmission control is affected. This reliable, tested OEM engine computer is your direct-fit solution, arriving at your door programmed and ready for installation.
We take the guesswork and high costs out of the equation. Forget expensive dealership visits or the need for specialized programming tools. Simply provide us with your vehicle’s VIN during checkout, and our experts will flash this PCM with the latest GM software updates specific to your truck. This ensures seamless communication between all modules and restores the performance and reliability you depend on. This is the most straightforward way to solve complex electronic issues and get your truck running right again.
Case Study: A Tricky Diagnosis
I remember a ’99 Chevy Suburban that came into the shop on a tow truck. The owner had replaced the fuel pump, crank sensor, and ignition coil, but it still had an intermittent no-start and would randomly stall. No clear trouble codes were stored, just a generic U1000 ‘Loss of Communication’ code that would pop up occasionally. After checking all the grounds and power feeds to the PCM, we connected a scope. We found the 5-volt reference signal, which powers most of the engine sensors, was dropping out randomly. This is a classic sign of internal PCM failure. We swapped in a VIN-programmed module just like this one, and the truck fired up instantly and ran perfectly. It saved the customer hundreds in further diagnostic time and parts.
Is Your GM Truck Showing These Signs of PCM Failure?
- ✔ Persistent Check Engine Light with codes that won’t clear, especially P0601 (Internal Control Module Memory Check Sum Error).
- ✔ Intermittent or complete no-start condition, even with a good battery and starter.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Poor fuel economy or a noticeable loss of engine power.
- ✔ Communication errors with a scan tool (U-codes).
- ✔ The engine stalls unexpectedly while driving or at idle.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle in under 30 minutes with basic hand tools. It’s typically located in the engine bay on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most models like the Yukon, Tahoe, and pickups, it’s mounted to a bracket on the driver’s side inner fender, near the firewall.
- Disconnect Connectors: Carefully unclip and remove all the electrical harness connectors from the old PCM. They are color-coded, making re-connection simple.
- Remove the Old Unit: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the color-coded harness connectors into the new module. You’ll hear a click when they are fully seated. Reconnect the negative battery terminal.
- Perform Security Relearn: In some cases, a simple security relearn procedure is needed. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this 3 times, and the vehicle should start.
Verified Compatibility for Your GM Vehicle
This PCM, identified by part number 16266645 or interchangeable number 09355699, is a guaranteed fit for a wide range of popular GM trucks and vans. Please match your part number or vehicle from the list below to ensure compatibility.
- GMC Yukon & Chevy Tahoe: 1998-1999
- GMC & Chevy Suburban (1500/2500): 1998-1999 (Gasoline)
- GMC Sierra & Chevy Silverado (1500/2500/3500): 1998-1999 (Gasoline)
- Cadillac Escalade: 1999
- GMC Savana & Chevy Express Vans (1500/2500/3500): 1998-1999 (Gasoline)
- GMC Jimmy, Chevy Blazer, Olds Bravada, GMC Sonoma, Chevy S10: 1998 (4.3L V6)
- And more… (Refer to the detailed fitment list for specific models like Astro, Safari, and Hombre)
Frequently Asked Questions
How do I provide my VIN?
After completing your purchase, simply reply to your order confirmation email with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information for programming.
Is this part difficult to install?
Not at all. For most DIY mechanics with basic tools, this is a simple, plug-and-play installation that takes less than an hour. Our step-by-step guide above walks you through the process.
What is the security relearn procedure?
It’s a simple process to sync the new PCM with your vehicle’s anti-theft system. It involves cycling the ignition key and waiting, requiring no special tools. We include instructions if this step is necessary for your vehicle.
This part is used. Is it reliable?
Absolutely. Every module is sourced from a salvaged vehicle and thoroughly inspected and tested to ensure it meets OEM functional standards. You get a genuine GM part, programmed with the latest software, at a fraction of the cost of a new one.
My old part number is different. Will this still work?
Yes, this PCM is a direct replacement for several part numbers, including 09355699, 16250279, 16258815, and more. As long as your vehicle is on our compatibility list, this module will function correctly once programmed to your VIN.