Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 GMC Yukon, Tahoe, or Suburban running rough, stalling unexpectedly, or throwing confusing check engine light codes? You’re not alone. The Powertrain Control Module (PCM) is the brain of your vehicle, and when it starts to fail, it can cause a host of frustrating and hard-to-diagnose problems. This isn’t just an inconvenience; it’s a matter of reliability. Instead of paying a fortune at the dealership for a new module and separate programming fees, get back on the road with this reliable, fully programmed replacement PCM.
This is a quality, tested used ECM that we flash with the latest official GM software updates specific to your vehicle. All we need is your Vehicle Identification Number (VIN) after your purchase. This critical step ensures that when the module arrives, it’s a true plug-and-play solution, ready to restore proper engine management, transmission shifting, and fuel economy. This is the straightforward, cost-effective fix you’ve been searching for to get your trusted GM truck running like it should.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I once had a ’99 Suburban in my shop that was giving the owner fits. It would start and run perfectly for weeks, then suddenly refuse to start. No crank, no communication with the scan tool. After checking all the usual suspects—battery, starter, ignition switch—I noticed the security light was flashing erratically during the no-start events. All signs pointed to a communication breakdown. After hooking up a scope, I confirmed the PCM was intermittently failing to power up and communicate on the data bus. We swapped in a quality, pre-programmed PCM like this one, performed the quick security relearn, and the truck fired up every single time. It’s a classic failure mode for these modules, and this replacement 1998-1999 Yukon PCM is the exact solution that solves it.
Is Your GM Truck Showing These Signs of a Bad PCM?
- ✔ Check Engine Light is on with codes pointing to internal module failure (like P0601, P0605).
- ✔ The engine cranks but refuses to start for no apparent reason.
- ✔ Unexplained stalling, either while driving or at idle.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Poor fuel economy and a noticeable loss of engine power.
- ✔ Communication errors with your scan tool (U-codes).
- ✔ Gauges on the instrument cluster behaving erratically or not working at all.
A Straightforward Guide to Your PCM Installation
Replacing the PCM is a job most DIYers can handle in under an hour. Follow these steps for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these trucks and vans (like the Yukon, Tahoe, and C/K Pickups), the PCM is located in the engine compartment on the driver’s side, often near the fender or firewall.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harness connectors from the old PCM. These connectors have locking tabs, so be gentle to avoid damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Seat your replacement 1998-1999 Yukon PCM into the mounting bracket and secure it. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: For many of these GM vehicles, a simple security relearn procedure is required. This typically involves turning the key to the ‘ON’ position for 10-15 minutes until the security light stops flashing. Repeat this process two more times. Your vehicle should then start and run correctly.
Verified Fitment for Your GM Truck or Van
This module is a direct replacement for service number 9366810 and is compatible with several other part numbers including 09355699, 16266645, 16250279, and 16258815. It is guaranteed to fit a wide range of 1998-1999 General Motors vehicles that use the service ID 09355699. This includes, but is not limited to:
- ✔ 1998-1999 GMC Yukon / Chevrolet Tahoe / Cadillac Escalade
- ✔ 1998-1999 GMC Suburban / Chevrolet Suburban
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- ✔ 1998 Chevrolet Astro / GMC Safari
- ✔ 1998 Chevrolet S10 / GMC Sonoma / Isuzu Hombre (4.3L)
- ✔ 1998 Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada
By providing your VIN, we ensure this 1998-1999 Yukon PCM is programmed correctly for your specific model, engine, and options, guaranteeing compatibility.
Frequently Asked Questions
What exactly is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls critical functions of the engine and transmission, such as fuel injection, ignition timing, and automatic gear shifts, to ensure optimal performance and efficiency.
Is any additional programming needed after I install it?
No! We program the module to your vehicle’s VIN before shipping. The only step you may need to perform is a simple security relearn procedure, which can be done at home without any special tools.
How do I provide my VIN number?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information.
Is this a new part?
This is a high-quality, fully tested used PCM sourced from a salvaged vehicle. Each unit is inspected and then professionally programmed with the latest GM software to ensure it functions correctly.
Will this fix my specific problem?
This module is a direct solution for failures within the PCM itself. While it resolves many common issues like stalling, no-start conditions, and certain check engine lights, it’s always best to have a proper diagnosis to confirm the PCM is the root cause of your vehicle’s problem.
Where is the PCM located on my 1999 Yukon?
On a 1999 GMC Yukon, the PCM is typically found in the engine bay, mounted on the driver’s side inner fender, near the battery and fuse box.