Restore Your Truck’s Brain and Get Back on the Road
Is your 1998-1999 GMC Yukon, Tahoe, or Suburban running rough, stalling unexpectedly, or throwing a stubborn Check Engine Light? You’re not just dealing with an annoyance; you’re likely facing a failing Powertrain Control Module (PCM), the central computer of your vehicle. In my 20+ years of diagnostics, I’ve seen countless GMT400-platform trucks sidelined by these exact issues. A faulty PCM can cause everything from poor fuel mileage and erratic transmission shifting to a complete no-start condition, leaving you stranded. This isn’t just a part; it’s the command center for your engine and transmission, and when it fails, your reliable truck becomes anything but.
This isn’t a generic, off-the-shelf computer. This is a dependable, tested, used OEM Powertrain Control Module that we program specifically for your vehicle using your VIN. We install the latest GM-certified software updates, ensuring your engine operates with the most current fuel maps, idle strategies, and transmission shift points. This crucial step, which often requires an expensive trip to a dealership, is done for you before we even ship the part. You get a component that is ready for installation right out of the box, saving you time, money, and the headache of coordinating with a programming service.
A Technician’s Notebook: The Phantom No-Start
I remember a ’99 Suburban that came into the shop on a tow truck. The owner had replaced the battery, alternator, and even the fuel pump, but it would still randomly refuse to start. No codes, no clear culprit. After confirming good fuel pressure and spark, I started checking the PCM’s power and ground circuits—they were solid. On a hunch, I connected my scope to the 5-volt reference line from the PCM. It was dropping out intermittently. The PCM was failing internally, but only when it warmed up. We swapped in a VIN-programmed PCM just like this one, and the truck fired up instantly. It’s a classic failure mode for these modules, and a direct replacement is the only reliable fix.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution for your 1998-1999 Yukon PCM issues:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601 (Internal Memory Error) or P0606 (PCM Processor Fault)
- ✔ Vehicle refuses to start or starts and immediately stalls
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel economy
- ✔ Engine misfires or runs rough with no other apparent cause
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Installing your pre-programmed PCM is a job most DIYers can handle in under an hour with basic hand tools. Following these steps ensures a smooth process.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine bay, typically on the driver’s side fender well or near the firewall.
- Disconnect the Connectors: Carefully unclip and remove the large wiring harness connectors from the old PCM. They are color-coded and can only fit in one way, so don’t worry about mixing them up.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into the mounting bracket.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle is equipped with a Passlock/VATS security system. You will need to perform a simple 10-30 minute key-cycle relearn procedure to sync the new PCM with your vehicle. Instructions are readily available online or we can provide them.
Verified Vehicle Compatibility
This PCM, identified by part number 09366810 or interchange ID 9355699, is a direct-fit replacement for a wide range of GM trucks, vans, and SUVs. Please verify your original part number or consult the list below. This module fits the following vehicles:
BLAZER S10/JIMMY S15 98 (RH front), w/o build date opt ZN4; ID 9355699
BRAVADA 98 (6-262, 4.3L), w/o build date opt ZN4; ID 9355699
CHEVROLET 1500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 9355699
CHEVROLET 2500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 9355699
CHEVROLET 3500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 9355699
ENVOY 98 (RH front), w/o build date opt ZN4; ID 9355699
ESCALADE 99 (LH front engine compartment), ID 9355699
EXPRESS 1500 VAN 98-99 (ID 9355699)
EXPRESS 2500 VAN 98-99 (Gasoline, ID 9355699)
EXPRESS 3500 VAN 98-99 (Gasoline, ID 9355699)
GMC 1500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 9355699
GMC 2500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 9355699
GMC 3500 PICKUP 98-99 (Gasoline, LH engine compartment), ID 9355699
ISUZU HOMBRE 98 (4.3L), w/o extended build date opt ZN4; ID 9355699
S10/S15/SONOMA 98 (6-262, 4.3L), w/o build date opt ZN4; ID 9355699
SAFARI (GMC) 98 (LH front by battery), ID 9355699
SAVANA 1500 VAN 98-99 (ID 9355699)
SAVANA 2500 VAN 98-99 (Gasoline, ID 9355699)
SAVANA 3500 VAN 98-99 (Gasoline, ID 9355699)
SUBURBAN 1500 98-99 (Gasoline, LH front), ID 9355699
SUBURBAN 2500 98-99 (Gasoline, LH front), ID 9355699
TAHOE 98-99 (Gasoline, LH front), ID 9355699
YUKON 98-99 (LH engine compartment), ID 9355699
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information.
Is this a new part?
No, this is a thoroughly tested, genuine OEM part sourced from a salvaged vehicle. This ensures OEM quality and fitment at a fraction of the cost of a new unit from the dealer.
Will I need to do anything else after installation?
Yes. Because the PCM is a core part of the vehicle’s anti-theft system (VATS/Passlock), you will need to perform a security relearn procedure. This typically involves a series of key cycles and takes about 30 minutes to complete.
What if my part number is slightly different?
This PCM, part number 09366810, is a direct replacement for several other part numbers, including 09355699, 16266645, 16250279, and more. As long as your vehicle is on the compatibility list, this module will work perfectly.
What is the benefit of getting the latest GM software?
Over the life of a vehicle, manufacturers release software updates to fix bugs and improve performance. These can correct issues with fuel efficiency, idle stability, and transmission behavior. Your programmed 1998-1999 Yukon PCM will have these updates already installed.