Is Your Late 90s GM Truck or Van Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, harsh shifting, or even a frustrating no-start condition in your 1998-1999 Suburban 1500, the Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen countless of these GMT400 platform vehicles develop electronic gremlins that trace back to a failing engine computer. This isn’t just a part; it’s the brain of your engine and transmission, and when it falters, the whole vehicle suffers.
This is a reliable, tested, and VIN-programmed replacement PCM that directly replaces part number 09355699 and other compatible service numbers. We take the guesswork and hassle out of the repair by programming it specifically for your vehicle before it ever leaves our shop.
The Smart, Simple Solution for Your GM Vehicle
Forget expensive dealership visits and the risk of installing a blank computer. We make this process straightforward:
- ✔ VIN Programmed: We flash this module with the latest official GM software calibration for your specific Vehicle Identification Number. This ensures correct engine, transmission, and emissions performance.
- ✔ Cost-Effective Repair: Get a fully functional, programmed computer for a fraction of the cost of a new unit from a dealer.
- ✔ Broad Compatibility: This PCM is a direct fit for a wide range of popular GM trucks and vans from the 1998-1999 era, including the Tahoe, Yukon, Express, Savana, and various pickups (see full list below).
- ✔ Tested and Verified: Sourced from a salvaged vehicle, each unit is inspected and verified to be in good working condition before programming and shipment.
Expert Pro Tip: Don’t Mistake a Bad PCM for a Bad Fuel Pump
In my shop, a common misdiagnosis for these vehicles is a faulty fuel pump when the real issue is the PCM. A failing PCM can intermittently stop sending the signal to the fuel pump relay, causing the engine to stall or not start. A quick check is to listen for the fuel pump to prime for 2 seconds when you turn the key to the ‘ON’ position. If it’s silent sometimes but works others, the PCM’s fuel pump driver circuit could be the problem, not the pump itself. This simple check has saved my customers hundreds of dollars in unnecessary repairs.
Easy Installation for the DIYer
Installing your replacement 1998-1999 Suburban 1500 PCM is a job most home mechanics can handle in under an hour with basic tools. While this unit is plug-and-play, some vehicles may require a security relearn procedure, which is a simple process you can do in your driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most Suburbans, Tahoes, and Pickups, the PCM is located in the engine bay on the driver’s side, near the fender or firewall. On Express/Savana vans, it’s often in the LH rear of the engine compartment.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. Inspect the pins and connectors for any corrosion or damage and clean them with electrical contact cleaner if necessary.
- Swap the Modules: Unbolt the old PCM from its mounting bracket and install the new one in its place.
- Reconnect Everything: Securely plug the wiring harnesses into your new PCM and reconnect the negative battery terminal.
- Perform Security Relearn (if needed): If the truck starts and immediately stalls, a security relearn is necessary. Turn the key to ‘ON’ for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle 3 times. On the fourth try, the vehicle should start and run.
Will This Fit My Vehicle?
This module, identified by service number 09355699, is the correct replacement for units with any of the following part numbers:
Compatible Part Numbers: 09355699, 16266645, 16250279, 16258815, 09366810, 9366810
It is designed for a wide array of 1998-1999 GM models including, but not limited to: Chevrolet/GMC C/K 1500/2500/3500 Pickups, Suburban, Tahoe, Yukon, Escalade, Express/Savana Vans, Astro/Safari Vans, S10/Sonoma, Blazer/Jimmy, and more. Please verify your original part number or use the compatibility chart to ensure this is the correct part for your specific application.