Restore Peak Performance to Your GM Truck or Van
Is your trusty 1997 Chevrolet Express 3500 Van, or another GM vehicle from that era, suddenly giving you headaches? If you’re dealing with frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shifting. When it falters, the entire vehicle’s performance suffers.
This isn’t just a replacement part; it’s a complete, hassle-free solution. We take the guesswork and dealership expense out of the equation by pre-programming this module specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our technicians will flash the unit with the latest factory software from General Motors. This ensures your new 1997 Express 3500 PCM integrates seamlessly with your vehicle’s systems, restoring its original drivability and efficiency right out of the box.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I remember a 1997 GMC Savana that came into the shop with a ghost of a problem. The owner, a contractor, said it would randomly refuse to start—no crank, no click, nothing. Then, an hour later, it would fire right up. He’d already replaced the battery and starter. We checked grounds, relays, and the ignition switch, but everything tested fine. On a hunch, I tapped the PCM housing with a screwdriver handle while trying to start it, and it immediately cranked. The internal circuits of the original PCM were failing from years of heat cycles and vibration, causing an intermittent open circuit. A new, properly programmed PCM like this one solved the problem for good and got him back to his job sites without worry.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Stalling or cutting out while driving
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel mileage
- ✔ The engine cranks but refuses to start
- ✔ Failure to pass an emissions or smog test
- ✔ Diagnostic Trouble Codes (DTCs) stored, especially P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module Read Only Memory (ROM) Error)
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle in their own driveway. Our VIN programming makes it a true plug-and-play process. Here’s a general guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment on the driver’s side, often near the battery or firewall.
- Disconnect Wiring: Carefully unclip and remove the electrical connectors. These connectors have locking tabs; be gentle to avoid breaking them. Note their color and position if they are different.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in by a few small bolts.
- Install the New PCM: Mount your new, pre-programmed module in place and securely fasten the bolts.
- Reconnect Wiring: Firmly plug the electrical connectors back into their correct sockets until you hear a click.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Relearn (If Needed): While not always required, some vehicles may need a security or Crankshaft Position Sensor (CASE) relearn procedure. A capable scan tool is typically needed for a CASE relearn.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16229684 and 8162296840. It is guaranteed to fit the following 1997 gasoline-engine models:
- Chevrolet/GMC 1500, 2500, & 3500 Pickups
- Chevrolet Express 1500, 2500, & 3500 Vans
- GMC Savana 1500, 2500, & 3500 Vans
- Chevrolet Suburban 1500 & 2500
- Chevrolet Tahoe & GMC Yukon
- Chevrolet S10 / GMC Sonoma (4.3L V6)
- Chevrolet Blazer / GMC Jimmy (4.3L V6)
- Oldsmobile Bravada (4.3L V6)
- Chevrolet Astro / GMC Safari Vans
- Isuzu Hombre (4.3L V6)
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) allows us to program the PCM with the exact software calibration your vehicle requires. This includes specifications for the engine, transmission, emissions equipment, and even tire size. This step is critical for ensuring your vehicle runs correctly and is the main reason our modules are a direct-fit solution.
Is this a plug-and-play part?
Yes! Because we pre-program the module to your VIN, it arrives ready to install. In most cases, you can simply swap the part and start your vehicle. Some vehicles may require a security relearn procedure, which can often be done without special tools by cycling the key.
Will this fix my transmission shifting problems?
If your shifting issues are caused by faulty electronic commands from the PCM, then yes, this will resolve them. The PCM controls transmission line pressure and shift points. A failing module often sends incorrect signals, leading to harsh or delayed shifts.
Do I need to return my old PCM?
This purchase does not require you to send back your old part. There is no core charge associated with this item, saving you the time and expense of return shipping.
What if my part number is slightly different?
This module is a direct replacement for part numbers 16229684 and 8162296840. If your module has a different number, please contact us with your VIN and original part number to ensure we find the correct match for your vehicle.