Restore Peak Performance to Your GM Truck or SUV
Is your 1998-1999 GMC Yukon, Chevrolet Tahoe, or Suburban running rough, shifting erratically, or failing to start? These are classic signs of a failing Powertrain Control Module (PCM), the central computer responsible for managing your vehicle’s engine and transmission. A faulty PCM can lead to a cascade of frustrating issues, from poor fuel economy and failed emissions tests to leaving you stranded. This direct-fit replacement PCM, part number 09355699, is the definitive solution to restore your vehicle’s reliability and drivability.
The Brain of Your Vehicle’s Operation
The PCM in your late-90s GM truck is a critical component. It constantly analyzes data from sensors throughout the engine and transmission to make real-time adjustments to fuel delivery, spark timing, and transmission shift points. When it begins to fail, the signals it sends become erratic or stop altogether, leading to a wide range of performance problems. Replacing a failing module isn’t just about fixing a single issue; it’s about restoring the entire integrated system to its original factory specifications.
From the Diagnostic Bay
We had a ’99 Suburban come in that was driving the owner crazy. It would randomly stall at stoplights, and the transmission would sometimes refuse to shift out of second gear. He had already replaced the fuel pump and a handful of sensors with no luck. The check engine light was intermittent, throwing different codes each time. After hours of chasing electrical ghosts, we finally traced the issue to an internally failing PCM. The module was sending corrupt data, causing all the downstream components to behave erratically. We installed a VIN-programmed PCM like this one, and the truck immediately ran like it just rolled off the assembly line. It’s a reminder that sometimes the most confusing problems lead back to the central computer.
Diagnosing and Replacing Your 1998-1999 Yukon PCM
Identifying a bad PCM can be tricky, as its symptoms often mimic other failing parts. However, if you’re experiencing multiple issues from the list below, the PCM is a primary suspect. This replacement 1998-1999 Yukon PCM is engineered to resolve these very problems, providing a stable and reliable foundation for your vehicle’s powertrain management.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine stumbling, misfiring, or running rough.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle fails to start or stalls intermittently.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
Plug-and-Play Solution with VIN Programming
One of the biggest hurdles in replacing an engine computer is the required programming. This module eliminates that step for you. Before we ship your part, we flash it with the latest GM-certified software specifically for your vehicle using the VIN you provide. This ensures that all factory parameters, including engine and transmission calibrations, are perfectly matched to your truck. The result is a simple, plug-and-play installation that doesn’t require an expensive trip to a dealership. Simply provide your VIN at checkout, and we handle the rest.
This module is a direct replacement for part numbers 09355699, 16250279, and 09366810. Please verify the part number on your original module to ensure compatibility. This unit fits a wide range of GM trucks and vans from 1998-1999, including the Chevrolet/GMC pickups, Suburban, Tahoe, Yukon, Astro/Safari, and Express/Savana vans. Refer to the detailed fitment list to confirm this is the correct part for your specific vehicle and options.
Frequently Asked Questions
What exactly does the Powertrain Control Module (PCM) do?
The PCM, also known as the ECU or ECM, is your vehicle’s main computer. It controls all aspects of engine performance, including air-fuel mixture, ignition timing, and idle speed, as well as managing the automatic transmission’s shifting patterns. It’s essential for performance, fuel efficiency, and emissions control.
Do I need to program this module after I receive it?
No. This is the key benefit of our service. We program the module with your vehicle’s specific VIN before it ships. This makes the installation a simple plug-and-play process, saving you the time and expense of a dealership visit.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, your insurance card, or on the driver’s side of the dashboard, visible through the windshield.
Is any other procedure required after installation?
After installing the new PCM, you may need to perform a security relearn procedure (often called a CASE relearn or Passlock relearn) for the vehicle to start. This is a simple procedure that can typically be done without special tools and instructions can be found online for your specific model.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then yes, this part will resolve the issue. However, if the codes are for other failing components (like an oxygen sensor or ignition coil), those parts will still need to be addressed.
How can I be sure this part fits my vehicle?
The best way is to match the part number from your old PCM to one of the compatible numbers listed: 09355699, 16250279, or 09366810. You can also use the detailed fitment list on this page to confirm your make, model, year, and engine size.