Restore Peak Performance to Your GM Truck or SUV
If you’re dealing with baffling engine problems in your 1998-1999 GMC Yukon or another classic GM vehicle, the root cause is often the Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing PCM can cause a host of issues that seem unrelated, from poor fuel economy to a complete no-start condition. This isn’t just a part; it’s the brain of your engine, and when it falters, your vehicle’s reliability disappears. We offer a dependable and cost-effective solution: a thoroughly tested, used OEM PCM that comes fully programmed to your vehicle’s specific VIN.
Is Your GM Truck Showing These Signs?
A faulty PCM can be tricky to diagnose, as its symptoms often mimic other failing components. Before you start replacing sensors and pumps, see if your vehicle is experiencing any of the following common indicators of PCM failure. In my shop, these are the red flags that point directly to the engine’s computer.
- ✔ Unexplained Check Engine Light with communication error codes (like U0100) or internal module failure codes (P0601, P0602, P0605).
- ✔ The engine cranks but refuses to start.
- ✔ Harsh, erratic, or delayed transmission shifting.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Rough idling, stalling, or stumbling during acceleration.
- ✔ Intermittent issues that come and go with temperature changes.
A Technician’s Notebook: The Intermittent Suburban
I remember a ’99 Suburban that drove its owner crazy. It would run perfectly for weeks, then suddenly refuse to start, only to fire right up an hour later. No codes were stored. After checking fuel pressure and spark, which were fine when it was running, I focused on the PCM. On these older GM trucks, I’ve seen the internal drivers for the fuel injectors or ignition system fail when they get hot. We swapped in a programmed PCM, and the problem vanished for good. It wasn’t the fuel pump or the ignition module; it was a hairline crack on a circuit board inside the original computer, a classic failure mode.
The Smart Solution: VIN-Programmed and Ready to Install
Forget about expensive dealership visits and the hassle of finding a shop that can program modules for older vehicles. Our process is simple and designed to get you back on the road quickly. When you order this 1998-1999 Yukon PCM, you provide us with your vehicle’s VIN. We then flash the module with the latest GM-certified software calibration for your exact vehicle. This ensures all components—from the engine and transmission to the emissions system—communicate and function precisely as the factory intended. This is a genuine, salvaged OEM part, meaning it offers the original fit and function without the new-part price tag.
A Straightforward Guide to Installation
Installing your programmed PCM is a job most DIYers can handle in under an hour with basic hand tools. This process is for a typical GM truck like a Yukon, Tahoe, or Silverado; van locations may differ slightly.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most trucks, it’s found in the engine compartment on the driver’s side, often near the fender or firewall. It’s a silver box with multiple large wiring harness connectors.
- Disconnect the Harnesses: Carefully unclip and remove all electrical connectors from the old PCM. These connectors are often color-coded to prevent mix-ups.
- Remove the Old Module: Unbolt the mounting bracket holding the PCM in place and remove the old unit from the vehicle.
- Install the New PCM: Mount your new, programmed PCM in the same location and securely fasten it. Reconnect all wiring harnesses, ensuring they click firmly into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (CRITICAL): Your vehicle’s anti-theft system (PassLock/VATS) needs to sync with the new PCM. Turn the key to the ‘ON’ position (don’t start) for 10-15 minutes, or until the ‘Security’ light on the dash stops flashing and turns off. Turn the key off for 10 seconds, then repeat the cycle two more times. After the third cycle, the vehicle should start and run normally.
Verified Vehicle Compatibility
This module, identified by service number 16258815 or interchange ID 09355699, is a direct-fit replacement for a wide range of GM vehicles. Please verify your part number or consult the list below. This part is compatible with, but not limited to, the following models:
- Cadillac Escalade: 1999
- Chevrolet/GMC Pickups (1500, 2500, 3500): 1998-1999 (Gasoline Engines)
- Chevrolet/GMC Suburban (1500, 2500): 1998-1999 (Gasoline Engines)
- Chevrolet Tahoe / GMC Yukon: 1998-1999 (Gasoline Engines)
- Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 1998-1999 (Gasoline Engines)
- Chevrolet Astro / GMC Safari: 1998
- Chevrolet S10 / GMC Sonoma: 1998 (4.3L V6)
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada / GMC Envoy: 1998 (4.3L V6)
- Isuzu Hombre: 1998 (4.3L V6)
Frequently Asked Questions
What do I need to do after I purchase?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN. We cannot program and ship your module without it. You can typically add this in the notes at checkout or reply to your order confirmation email.
Is any additional programming required after installation?
No, the module arrives fully programmed for your engine and transmission. However, you MUST perform the vehicle’s security relearn procedure as outlined in the installation guide. This syncs the PCM to your vehicle’s anti-theft system and is required for the engine to start.
Since this part is used, how do I know it works?
Every module is sourced from a salvaged vehicle and then put through a series of power-on and communication tests on a bench before being programmed and shipped. We guarantee it will accept programming and function correctly upon arrival.
Will this fix my specific problem?
This part will resolve issues directly caused by a faulty PCM. While the symptoms we’ve listed are common indicators, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the point of failure before ordering.
What if my original part number is different?
This module is a direct replacement for several part numbers, including 09355699, 16266645, 16250279, and others listed in the description. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.