Get Your Workhorse Back on the Road: The Right PCM, Programmed and Ready.
Is your 1998 or 1999 GMC 2500 letting you down? If you’re dealing with frustrating engine issues, a failing Powertrain Control Module (PCM) is often the culprit. In my 20+ years in the shop, I’ve seen these exact symptoms hundreds of times on these otherwise bulletproof GM trucks. The PCM is the brain of your engine and transmission, and when it starts to go, it can cause a cascade of problems that seem unrelated.
Is Your Truck Showing Signs of a Bad PCM?
A faulty PCM can manifest in ways that are easy to misdiagnose. Before you start throwing expensive sensors at the problem, see if these symptoms sound familiar:
- โ Unexplained Check Engine Light that won’t go away.
- โ Rough, inconsistent idle or stalling at stops.
- โ Harsh or erratic automatic transmission shifting.
- โ A complete no-start condition where the engine cranks but won’t fire.
- โ Poor fuel economy that has gotten noticeably worse.
- โ Communication errors with your scan tool.
The Plug-and-Play Solution for Your 1998-1999 GMC 2500 PCM
This isn’t just a used part pulled from a yard. This is a tested, reliable OEM Powertrain Control Module that we program specifically for YOUR truck using the VIN you provide. We flash it with the latest GM software updates, ensuring it communicates perfectly with your vehicle’s systems. This critical programming step means you can avoid a costly trip to the dealership for setup. Itโs designed to restore your truck’s original performance and reliability.
A Mechanic’s Real-World Experience
“A customer’s 1999 Chevy Suburban came in last week with a classic no-start after a new PCM was installed from another supplier. The engine would crank but never fire, and the ‘Security’ light was flashing. The problem wasn’t the PCM itself, but that it hadn’t been synched with the truck’s Passlock anti-theft system. After installing our correctly programmed module, we performed the simple 30-minute security relearn procedure right in the bay, and it fired up on the first try. This step is crucial and something many people overlook.”
Easy Installation: Get it Done in Your Driveway
You don’t need to be a master mechanic to replace this module. With basic hand tools, you can get your truck running right again. Follow these steps for a smooth installation:
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the PCM: On most of these trucks and vans, it’s found in the engine compartment, typically on the driver’s side fender.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. Inspect the pins for any corrosion and clean them with contact cleaner if necessary.
- Swap the Modules: Unbolt the old PCM from its mounting bracket and secure the new one in its place.
- Reconnect & Power Up: Firmly plug the wiring harnesses into your new PCM. Reconnect the negative battery terminal.
- Perform Security Relearn: Turn the key to the ‘ON’ position (without starting) and wait 10-15 minutes until the ‘Security’ light stops flashing and turns off. Turn the key off for 10 seconds. Repeat this cycle two more times (for a total of 3 cycles / ~30 minutes). After the third cycle, the vehicle will be synched with the new PCM and should start.
Guaranteed Compatibility
This module is a direct replacement for several part numbers. If your original module has one of the following numbers, this unit will work for you: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810. Please verify the part number on your current module before ordering.