Get Your GMT400 Truck Back to Peak Performance
Is your reliable 1998-1999 GMC 2500 Pickup suddenly giving you headaches? If you’re dealing with a persistent check engine light, poor engine performance, erratic shifting, or a frustrating no-start condition, the Powertrain Control Module (PCM) is a likely culprit. As the central computer for your engine and transmission, its proper function is critical. This isn’t just a replacement part; it’s a direct solution, a tested, used PCM that arrives at your door programmed with the latest GM software updates specifically for your truck’s Vehicle Identification Number (VIN).
Over my 20 years in the bay, I’ve seen countless owners and shops waste time and money chasing phantom issues when the root cause was a failing computer. A faulty PCM can mimic a bad fuel pump, failing sensors, or transmission problems. Our process eliminates the guesswork. By providing us with your VIN upon purchase, we flash this module to your vehicle’s exact specifications. This ensures seamless communication between all systems and resolves many of the software-related bugs that were common on original factory calibrations. This is the most efficient way to restore your truck’s original power, fuel economy, and reliability.
A Technician’s Notebook: The Intermittent Stall
I remember a ’98 Chevy K2500 with the 5.7L that came into the shop on a tow hook. The owner had already replaced the fuel pump and filter, convinced it was a fuel delivery issue. The truck would start cold, run for 10 minutes, then stall and refuse to restart for an hour. No fuel pressure codes, no sensor codes—just a dead engine. After hooking up the scan tool and monitoring live data, I noticed the injector pulse width would drop to zero right before it stalled. The PCM was simply shutting off the fuel injectors as it warmed up. We swapped in a pre-programmed PCM just like this one, and the truck fired up and ran perfectly for over an hour. It was a classic case of thermal failure inside the module, something a simple code reader can’t always pinpoint.
Is Your Truck Showing These Symptoms?
A failing PCM can cause a wide range of issues. If you’re experiencing any of the following, this module is your likely solution:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Stalling, stumbling, or rough idling
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ No-start or intermittent starting problems
- ✔ Communication error codes, such as U0100
- ✔ Internal module fault codes, like P0601 or P0606
A Straightforward Guide to Installation
Getting your truck back on the road is easier than you think. With our pre-programmed module, you can avoid a costly trip to the dealership. Follow these general steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your truck’s battery before starting any electrical work.
- Locate the PCM: On most 1998-1999 GM trucks, the PCM is located in the engine compartment on the driver’s side, often near the fender or firewall. It’s a silver metal box with multiple large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. There are typically release tabs you’ll need to press. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, programmed PCM into place. Firmly reconnect the electrical harnesses, ensuring they click and lock securely.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new PCM. This usually involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual or a reliable online resource for the specific steps for your vehicle.
Verified Vehicle Compatibility
This module is a direct replacement for service number 16250279 and interchanges with several other part numbers. It is guaranteed to fit a wide range of GM vehicles. Please verify your vehicle is on this list and that the service ID on your original module is 09355699.
CHEVROLET 2500 PICKUP 98-99 (Gasoline)
CHEVROLET 3500 PICKUP 98-99 (Gasoline)
GMC 1500 PICKUP 98-99 (Gasoline)
GMC 2500 PICKUP 98-99 (Gasoline)
GMC 3500 PICKUP 98-99 (Gasoline)
SUBURBAN 1500/2500 98-99 (Gasoline)
TAHOE/YUKON 98-99 (Gasoline)
ESCALADE 99
ASTRO/SAFARI VAN 98
BLAZER S10/JIMMY S15 98 (w/o build date opt ZN4)
BRAVADA 98 (w/o build date opt ZN4)
ENVOY 98 (w/o build date opt ZN4)
EXPRESS/SAVANA VAN 1500/2500/3500 98-99 (Gasoline)
ISUZU HOMBRE 98 (4.3L, w/o extended build date opt ZN4)
S10/S15/SONOMA 98 (4.3L, w/o build date opt ZN4)
Frequently Asked Questions
Do I need to do any programming myself?
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We program the PCM to your vehicle’s specific VIN before we ship it. This makes the installation process much simpler and saves you a trip to a mechanic or dealer for expensive programming.
What is the ‘Security Relearn Procedure’?
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We program the PCM to your vehicle’s specific VIN before we ship it. This makes the installation process much simpler and saves you a trip to a mechanic or dealer for expensive programming.
Is this a new part?
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We program the PCM to your vehicle’s specific VIN before we ship it. This makes the installation process much simpler and saves you a trip to a mechanic or dealer for expensive programming.
How do I provide my VIN?
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We program the PCM to your vehicle’s specific VIN before we ship it. This makes the installation process much simpler and saves you a trip to a mechanic or dealer for expensive programming.
Will this fix my check engine light?
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We program the PCM to your vehicle’s specific VIN before we ship it. This makes the installation process much simpler and saves you a trip to a mechanic or dealer for expensive programming.