Get Your GM Truck or SUV Back to Peak Performance
Is your 1998-1999 Chevy Tahoe, Suburban, or GMC Yukon running rough? Dealing with a persistent Check Engine Light, unpredictable stalling, or poor fuel mileage can be incredibly frustrating. As a technician with over two decades of experience under the hood, I’ve seen countless of these classic GM trucks sidelined by a failing Powertrain Control Module (PCM). The PCM is the brain of your vehicle, managing everything from fuel injection and spark timing to transmission shifting. When it starts to fail, the symptoms can be confusing and lead you down a rabbit hole of expensive, unnecessary repairs.
This isn’t just a replacement part; it’s a reliable, cost-effective solution. We offer a genuine, used OEM PCM, part number 9355699, that has been meticulously tested and is ready for a new life in your vehicle. The best part? We take care of the most critical step for you. Before this module ships, we will flash it with the latest official GM software updates, programmed specifically to your vehicle’s VIN. This ensures perfect compatibility and restores the performance and efficiency your truck had when it left the factory.
Case Study: A Tricky Diagnosis
I remember a ’99 Suburban that came into the shop with a classic complaint: intermittent stalling at stoplights and a P0300 (Random Misfire) code that wouldn’t go away. The owner had already replaced plugs, wires, the cap, and the rotor. We checked fuel pressure and scanned live data—everything looked normal until, suddenly, the fuel trims would go haywire just before it stalled. After ruling out mechanical issues, we swapped in a known-good PCM. The problem vanished instantly. The original PCM’s internal processor was failing under load, a common issue in these older units. This pre-programmed module would have saved that customer hundreds in diagnostic time and parts.
Is Your GM Truck or Van Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0604, or P0606 (Internal Module Failure).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass an emissions or smog test.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
Replacing the PCM in these GM trucks is a job most DIYers can handle in under an hour with basic hand tools. This pre-programmed module makes the process even simpler by eliminating the need for a trip to the dealer.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most trucks and SUVs like the Tahoe/Yukon, the PCM is located in the engine compartment, typically on the driver’s side fender well. On vans like the Express/Savana, it’s often in the rear of the engine compartment.
- Disconnect Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old PCM. There are typically multiple color-coded connectors.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will reuse it.
- Install the New Module: Mount your new, VIN-programmed PCM onto the bracket and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses back into the correct slots on the new PCM. Reconnect the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure (Passlock/VATS). This usually involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the new PCM to sync with your vehicle’s anti-theft system. After this, your truck should start and run correctly.
Will This Fit My Vehicle? Verified Compatibility
This module, identified by part number 9355699, is a direct replacement for a wide range of GM trucks, vans, and SUVs. It also interchanges with part numbers 16266645, 16250279, 16258815, 09366810, and 9366810. Please verify your vehicle is on the list below and that your original module carries one of these numbers for guaranteed compatibility.
- ✔ 1998-1999 Chevrolet & GMC C/K 1500/2500/3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- ✔ 1998-1999 Chevrolet & GMC Suburban 1500/2500 (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana 1500/2500/3500 Vans (Gasoline)
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Oldsmobile Bravada (4.3L)
- ✔ 1998 GMC Envoy (4.3L)
- ✔ 1998 Chevrolet S10 / GMC Sonoma (4.3L)
- ✔ 1998 Chevrolet Blazer / GMC Jimmy (4.3L)
- ✔ 1998 Isuzu Hombre (4.3L)
Frequently Asked Questions
Do I need to do any programming after I receive it?
No. We flash the module with the latest GM software and program it to your specific VIN before shipping. You will only need to perform the simple, tool-free security relearn procedure detailed in the installation guide.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically add it as a note during checkout or message us directly. We cannot ship the module until we receive your VIN.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new module.
What if my part number is slightly different?
This module (9355699) is a direct replacement for several other part numbers, including 16266645, 16250279, 16258815, and 09366810. As long as your original module has one of these numbers, this part will fit and function correctly.
What tools are needed for the security relearn?
No tools are needed! The VATS/Passlock relearn procedure only requires you to use your vehicle’s ignition key and wait for specific time intervals, typically 3 cycles of 10-15 minutes each.