Restore Your Van’s Reliability and Performance
Is your Chevrolet Express van giving you headaches? Unpredictable stalling, rough idling, poor fuel economy, or a lit-up Check Engine light can turn a dependable workhorse into a source of constant worry. These frustrating issues often point to a failing Powertrain Control Module (PCM), the vital computer that manages your engine’s performance and transmission’s shifting. This isn’t just an inconvenience; it’s a matter of reliability and safety. Take back control and restore the smooth, powerful operation you depend on with this precisely programmed PCM, a direct-fit solution for service part number 16250279.
A Mechanic’s Note: The Van That Wouldn’t Quit Quitting
I remember a customer, a local contractor named Dave, who brought in his ’98 Express 2500. It was his mobile office and tool shed, and it was randomly stalling at traffic lights. He’d replaced sensors and checked wiring, but the ghost in the machine remained. After diagnostics, we traced it to an intermittent internal failure in the PCM. Swapping in a VIN-programmed module wasn’t just a repair; it was giving him his business back. The look of relief on his face when he picked up his van, running like it should, is why we do this. It’s about restoring that essential confidence in your vehicle.
Warning Signs Your PCM Needs Attention
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, this module is the definitive solution:
- ✔ Check Engine Light: Often with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication-related faults.
- ✔ Erratic Engine Behavior: Unexplained stalling, rough running, hesitation, or misfires that other parts can’t seem to fix.
- ✔ Poor Shifting: Harsh or delayed gear changes, or the transmission getting stuck in one gear (limp mode).
- ✔ No-Start Condition: The engine cranks but refuses to start, and you’ve ruled out fuel and spark issues.
- ✔ Decreased Fuel Efficiency: A sudden, noticeable drop in your miles per gallon as the engine struggles to run efficiently.
Guided Installation for a Confident Fix
Getting your van back in top shape is easier than you might think. This module is sent to you programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership programming. Follow these simple steps for a successful installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most 1998 Express vans, the PCM is located in the engine compartment on the driver’s side, near the battery.
- Disconnect the Harnesses: Carefully unplug the electrical connectors from the old module. They have locking tabs that may need to be gently pried up.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you’ll need it for the new one.
- Install the New PCM: Mount your new, pre-programmed module in place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Reconnect the Battery: Re-attach the negative battery terminal and tighten it.
- Perform Security Relearn: Your vehicle is equipped with a Passlock/VATS security system. You will need to perform a simple 10-minute security relearn procedure. Turn the key to the ‘ON’ position (don’t start the engine), wait 10 minutes until the security light goes out, turn the key off for 5 seconds, and then the vehicle will start.
Guaranteed Fit for Your 1998 Express 2500 PCM
This module is the correct replacement for a wide range of GM trucks and vans from the late 90s. It is a direct replacement for part numbers 16250279, 09366810, and 09355699. Please verify your part number and check the detailed fitment list below to ensure perfect compatibility with your vehicle.
GMC/CHEVROLET 1500/2500/3500 PICKUP 98-99 (Gasoline, ID 16250279)
SUBURBAN 1500/2500 98-99 (Gasoline, ID 16250279)
TAHOE/YUKON 98-99 (ID 16250279)
ASTRO/SAFARI VAN 98-99 (ID 16250279)
EXPRESS/SAVANA 1500/2500/3500 VAN 98 (Gasoline, ID 16250279)
BLAZER S10/JIMMY S15 98 (w/o build date opt ZN4; ID 16250279, 16258815)
S10/S15/SONOMA 98 (4.3L, w/o build date opt ZN4; ID 16250279, 16258815)
BRAVADA 98 (w/o build date opt ZN4; ID 16250279, 16258815)
ENVOY 98 (w/o build date opt ZN4; ID 16250279, 16258815)
ISUZU HOMBRE 98 (4.3L, w/o extended build date opt ZN4; ID 16250279, 16258815)
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. Because this PCM comes programmed to your VIN, the main step is performing the vehicle’s security relearn procedure (VATS/Passlock). This simple process syncs the new PCM with your vehicle’s anti-theft system and typically takes about 10-15 minutes. Instructions are included, and it requires no special tools.
What information do you need from me?
After you complete your purchase, we will need your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct, factory-approved software for your specific vehicle configuration, ensuring a perfect match and proper function.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the electronic portion of the transmission is sound, a faulty PCM is a very common cause of poor shifting, slipping, or being stuck in gear. This module restores those critical communication pathways.
Is this a plug-and-play part?
Essentially, yes. Because we handle the programming before shipping, you will not need to take the vehicle to a dealer for expensive flashing. You simply install the part and perform the security relearn procedure, making it a straightforward job for a DIYer or any professional mechanic.
How do I find my current PCM part number?
The part number is printed on a sticker on the PCM itself. You will need to locate the module on your vehicle and find the service number, which will match one of the compatible numbers listed (e.g., 16250279).