Restore Your Van’s Heartbeat and Get Back on the Road
Is your 1998 Chevy Express 3500 feeling sluggish, unpredictable, or refusing to start? A failing Powertrain Control Module (PCM) can be the hidden culprit behind a host of frustrating issues, turning your reliable workhorse into a source of daily stress. From a persistent Check Engine Light to erratic shifting and poor fuel economy, a faulty engine computer can disrupt every aspect of your drive. This isn’t just an inconvenience; it’s a matter of reliability and peace of mind. We’re here to provide the definitive solution: a professionally programmed PCM, tailored specifically to your vehicle’s VIN, that restores factory performance and lets you drive with confidence again.
Warning Signs Your PCM Needs Attention
If you’re noticing any of the following symptoms, it’s a strong indicator that your vehicle’s central computer may be failing. Replacing it with our pre-programmed unit can resolve these issues and prevent further complications.
- ✔ Check Engine Light: The light stays on, often with communication-related diagnostic trouble codes (DTCs) like P0601, P0602, P0605, or P0606.
- ✔ No-Start Condition: The engine cranks but won’t start, even with a good battery and fuel supply.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, or rough idling.
- ✔ Reduced Fuel Economy: Your van is suddenly consuming more fuel than usual without any change in driving habits.
- ✔ Erratic Transmission Shifting: The automatic transmission may shift harshly, at the wrong times, or get stuck in one gear.
- ✔ Intermittent Stalling: The engine shuts off unexpectedly while driving or at a stop.
A Pro’s Diagnostic Tip
“Before you’re certain the PCM is the problem, take 15 minutes to check your basics. I’ve seen countless cases where a corroded ground wire or a loose battery terminal caused symptoms that perfectly mimicked a failed computer. Specifically, check the main engine-to-chassis ground strap. A solid connection is critical for the PCM’s health. Verifying you have clean power and ground at the PCM connector can save you a lot of guesswork and confirm you’re replacing the right part.”
Guided Installation for a Confident Repair
Installing your new 1998 Express 3500 PCM is a straightforward process. Because we program the module to your VIN before shipping, you can avoid a costly trip to the dealership. Follow these steps for a smooth installation.
- Safety First: Always begin by disconnecting the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On most 1998 GM vans and trucks, the PCM is located in the engine compartment, typically on the driver’s side near the battery or firewall.
- Disconnect the Harnesses: Carefully unclip the electrical wiring harnesses from the old module. These connectors have locking tabs that need to be released before they can be pulled away. Avoid forcing them.
- Remove the Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need it for the new unit.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect and Secure: Firmly plug the wiring harnesses into the new module until they click into place, ensuring a solid connection.
- Power Up: Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure (often called a Passlock or VATS relearn) to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Instructions are readily available online for your specific model.
Tailored Fit for Your Ride
This module is a direct-fit replacement, ensuring seamless integration with your vehicle. It is compatible with part numbers 09355699, 16250279, and 09366810. Please verify compatibility with your specific make, model, and engine below:
- 1998-1999 Chevrolet & GMC C/K 1500/2500/3500 Pickups (Gasoline)
- 1998 Chevrolet Express 1500/2500/3500 Vans (Gasoline)
- 1998 GMC Savana 1500/2500/3500 Vans (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- 1998-1999 Chevrolet & GMC Suburban (Gasoline)
- 1999 Cadillac Escalade
- 1998-1999 Chevrolet Astro & GMC Safari
- 1998 S10/Sonoma, Blazer/Jimmy, Bravada, Envoy, Hombre (4.3L)
By providing your VIN upon purchase, you guarantee that the 1998 Express 3500 PCM you receive has the correct software and calibration files, making this a true plug-and-play solution for your vehicle’s specific configuration.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you. Simply provide us with your vehicle’s 17-digit VIN after you place your order, and we will flash the module with the latest GM-certified software for your exact vehicle before it ships.
Where do I find my VIN?
Your VIN can be found on a metal plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
What is the security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. For most GM vehicles of this era, it involves cycling the ignition key on and off in a specific 30-minute sequence. This procedure does not require any special tools and can be done in your driveway.
Is this a new or a used part?
This is a high-quality, inspected, and tested OEM component that has been professionally prepared for your vehicle. Each unit undergoes a rigorous process to ensure it meets or exceeds original factory specifications for performance and longevity.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is faulty, it can cause poor shift quality, delayed engagement, or incorrect gear selection. A properly functioning PCM is essential for smooth transmission operation.