Is Your Late 90s GM Truck or Van Giving You Headaches?
If you’re dealing with frustrating issues on your 1998-1999 GMC 2500โlike a persistent check engine light, erratic shifting, a rough idle, or even a no-start condition that leaves you strandedโthe problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM starts to fail, it can create a cascade of baffling problems that are difficult to diagnose. You’re not just buying a part; you’re buying a solution to get your reliable truck back on the road.
This is a genuine, used OEM PCM that has been meticulously tested and is ready for a new life in your vehicle. The best part? We handle the most critical step for you. Before this module ever leaves our shop, we program it with the latest GM software updates, specifically matched to your truckโs Vehicle Identification Number (VIN). This means no expensive trips to the dealership and no need for special scan tools. Itโs a direct-fit, plug-and-play solution.
A Story From My Shop
“A customer’s ’99 Suburban came in last week with these exact symptoms. It would die at stoplights and had a transmission that shifted harshly between first and second gear. They had already replaced the fuel pump and multiple sensors with no luck. We hooked up our scope and saw the 5-volt reference signal from the PCM was dropping out intermittently. We installed one of these VIN-programmed modules, and it ran perfectly. Itโs a classic failure on these GMT400 platform vehicles, and a programmed PCM is almost always the fix.”
Common Symptoms of a Failing 1998-1999 GMC 2500 PCM
If you’re experiencing any of the following, a faulty engine computer is a likely cause:
- โ Check Engine Light is on with various communication or sensor codes.
- โ The engine cranks but refuses to start.
- โ Poor fuel economy and loss of power.
- โ Harsh or erratic automatic transmission shifting.
- โ Intermittent stalling, especially when the engine is warm.
- โ The anti-theft or security light stays on, preventing startup.
Simple, Straightforward Installation
You don’t need to be a master technician to replace this module. With a few basic hand tools, you can get the job done in your own driveway. This module may require a security relearn procedure, which is a simple process that does not require any special tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most trucks and SUVs, the PCM is located in the engine compartment, typically on the driver’s side fender. On vans, it’s often in the LH rear of the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the electrical connectors, ensuring they click securely into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Needed): Turn the key to the ‘ON’ position for 10-15 minutes, then turn it ‘OFF’ for 10 seconds. Repeat this cycle 3 times. On the final cycle, the vehicle should start.
Guaranteed Compatibility
This PCM is a direct replacement for a wide range of GM trucks, vans, and SUVs from 1998-1999. It is compatible with multiple service numbers. To ensure a perfect match, please verify your original part has one of the following numbers printed on the label: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810. This part fits models like the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Suburban, Express, Savana, and more, as long as the service ID number is 9355699.
IMPORTANT: After you complete your purchase, you must send us your 17-digit VIN. We cannot ship your order until we have this information to program the module correctly.