Is Your Late 90s GM Truck Giving You Headaches?
If you’re dealing with a 1998 or 1999 Chevrolet, GMC, or Cadillac truck or van that’s suddenly stalling, running rough, refusing to start, or throwing a cascade of confusing check engine light codes, the problem is often the very brain of the operation: the Powertrain Control Module (PCM). After 20+ years on the road, these original modules are a common failure point. I’ve seen it hundreds of times in my shopโa customer comes in after replacing sensors and chasing electrical gremlins, only to find the PCM itself was the root cause.
This isn’t just a replacement part; it’s a direct, hassle-free solution. We are offering a reliable, tested used PCM that is professionally programmed to your specific vehicle using your VIN. This critical step ensures that when you receive the part, it’s ready to install and communicate perfectly with your truck’s engine, transmission, and security system.
The “Plug & Play” Solution You’ve Been Looking For
Forget about towing your truck to a dealership and paying hundreds for diagnostics and programming. This module restores your vehicle’s original performance and functionality with a simple installation you can do in your own driveway.
- โ VIN Programmed for You: We flash this module with the latest GM software updates using your vehicle’s VIN. This ensures 100% compatibility.
- โ Solves Common Issues: Directly addresses symptoms like harsh shifting, no-start conditions, random stalling, and persistent diagnostic trouble codes (DTCs).
- โ Cost-Effective Repair: Get a fully functional, programmed module for a fraction of the cost of a new unit and dealer programming fees.
- โ Broad Compatibility: This unit, identified by service number 09355699, replaces a wide range of original part numbers for vehicles like the Tahoe, Yukon, Suburban, Express/Savana vans, and S10/Blazer platforms.
Expert Diagnostics: A Real-World Scenario
“A customer’s ’99 Tahoe came in last week with these exact symptoms: it would crank but not start, and when it did run, it shifted hard between 1st and 2nd gear. The owner had already replaced the crank sensor and fuel filter. After a quick scan, I found no communication with the PCM. That’s the classic sign. We swapped in one of our pre-programmed modules, and the truck fired right up and shifted smoothly. It’s a repair I’ve done countless times, and it highlights how a faulty PCM can mimic other component failures.”
Easy Installation Guide: Get Back on the Road Fast
Installing your replacement 1999 Chevrolet 1500 PCM is straightforward. While locations vary slightly (e.g., LH engine compartment on a pickup, by the battery on an Astro van), the process is generally the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the existing module in your engine bay. It’s a silver metal box with several large multi-pin connectors.
- Disconnect Connectors: Carefully unlatch and remove all electrical harness connectors from the old PCM. Before you install the new module, take a moment to inspect the harness connectors. I use a small pick and some electrical contact cleaner to gently scrub any green or white corrosion from the pins. A clean connection is critical for these older trucks.
- Remove Old Module: Unbolt the old PCM from its mounting bracket.
- Install New Module: Bolt the new, pre-programmed module into place.
- Reconnect Everything: Firmly re-seat all electrical connectors until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In most cases, our programming handles the security. However, on rare occasions, a simple 10-30 minute key-cycle relearn procedure may be needed. Instructions are readily available online for your specific model.
Important: After placing your order, you MUST provide us with your 17-digit VIN to ensure we can program the module correctly before shipment. This step is essential for a successful, plug-and-play repair.