Restore Peak Performance to Your GM Truck or SUV
Is your trusty 1998-1999 Suburban, Tahoe, or Yukon suddenly giving you headaches? If you’re dealing with a persistent Check Engine Light, rough idling, stalling, or erratic transmission shifting, a failing Powertrain Control Module (PCM) is often the culprit. As the electronic brain of your vehicle, the PCM controls everything from fuel mixture and spark timing to transmission shift points. When it falters, the entire vehicle’s performance suffers. This isn’t just an annoyance; it can affect fuel economy and leave you stranded.
This is a reliable, tested, and VIN-programmed replacement PCM that serves as a direct-fit solution for your vehicle. We take the guesswork and high cost out of the repair process. Forget expensive dealership visits and towing fees. We flash this module with the latest GM software updates specific to your vehicle’s VIN, ensuring it arrives at your door ready for a straightforward installation. It’s the most efficient way to get your truck back to running the way it should.
From the Diagnostic Bay: The Intermittent Gremlin
I once had a 1999 Tahoe in the shop with a problem that drove the owner crazy. It would run perfectly for days, then suddenly start stumbling and lose power, sometimes setting a random misfire code, other times a communication error. We checked grounds, sensors, and wiring harnesses—everything looked solid. The issue was so intermittent, it was nearly impossible to replicate on demand. After exhausting the usual suspects, we hooked up a scope to the PCM outputs. We finally caught it: one of the injector driver circuits inside the module was intermittently dropping out under heat. A replacement, programmed PCM like this one solved the issue permanently. It’s a classic example of how a failing computer can mimic a dozen other mechanical problems.
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:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or stumbling for no apparent reason
- ✔ Rough or inconsistent idle
- ✔ Poor fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Vehicle won’t start, but the battery and starter are good
- ✔ Stored diagnostic trouble codes (DTCs) such as P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault)
A Straightforward Guide to Installation
Installing your programmed 1998-1999 Suburban 1500 PCM is a job most DIYers can handle with basic tools. Follow these steps to get back on the road quickly.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. These connectors have locking tabs that need to be released before pulling. Avoid forcing them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. There are usually two or three bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original bolts.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: Your vehicle may require a security relearn procedure, which can often be done without special tools (instructions are widely available online or in service manuals). In some cases, a Crankshaft Position Sensor (CASE) relearn with a capable scan tool is recommended for optimal performance, though the vehicle will typically run without it.
Verified Vehicle Compatibility
This module is a direct replacement for service ID 9355699 and part number 9366810. It is guaranteed to fit the following vehicles. Please match your service ID to ensure compatibility.
CHEVROLET 2500 PICKUP 98-99 (Gasoline, LH engine compartment)
CHEVROLET 3500 PICKUP 98-99 (Gasoline, LH engine compartment)
EXPRESS 1500/2500/3500 VAN 98-99 (Gasoline)
SUBURBAN 1500/2500 98-99 (Gasoline, LH front engine compartment)
TAHOE 98-99 (Gasoline, LH front engine compartment)
GMC 1500/2500/3500 PICKUP 98-99 (Gasoline, LH engine compartment)
SAVANA 1500/2500/3500 VAN 98-99 (Gasoline)
YUKON 98-99 (LH engine compartment)
CADILLAC ESCALADE 99 (LH front engine compartment)
OLDSMOBILE BRAVADA 98 (4.3L, w/o build date opt ZN4)
CHEVROLET ASTRO 98 (LH front by battery)
GMC SAFARI 98 (LH front by battery)
CHEVROLET BLAZER S10 98 (RH front, w/o build date opt ZN4)
GMC JIMMY S15 98 (RH front, w/o build date opt ZN4)
GMC ENVOY 98 (RH front, w/o build date opt ZN4)
CHEVROLET S10/S15/SONOMA 98 (4.3L, w/o build date opt ZN4)
ISUZU HOMBRE 98 (4.3L, w/o extended build date opt ZN4)
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential because it allows us to program the PCM with the exact software and calibrations your vehicle requires from the factory. This includes details about your engine, transmission, and other options. This VIN-specific programming makes the module a true plug-and-play part, saving you a trip to the dealership.
Is this a new part?
No, this is a high-quality, tested used PCM recovered from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed with fresh GM software and shipped to you. This provides a reliable and cost-effective solution.
Will this fix my transmission problems?
In many cases, yes. The PCM controls the electronic functions of the automatic transmission, including when and how firmly it shifts. If your transmission issues are electronic in nature (and not caused by an internal mechanical failure), a new PCM can resolve symptoms like harsh shifting, delayed engagement, or being stuck in one gear.
What if my original part number doesn’t match 9366810?
This module is compatible with several part numbers, including 09355699, 16266645, 16250279, and more. The most important number to match is the service ID, which is typically 9355699 for this application. As long as your vehicle is on our compatibility list and has that service ID, this module will work once programmed to your VIN.
Do I need to do anything after installation?
After installing the PCM and reconnecting the battery, you will likely need to perform a simple security relearn procedure. This allows the PCM to recognize your vehicle’s anti-theft system and keys. The procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes and can be done without any special tools.