1997 GMC 3500 PCM 16229684 | Programmed to Your VIN

Is Your 1997 GM Truck or Van Stalling, Shifting Erratically, or Refusing to Start?

If you’re behind the wheel of a classic 1997 GM workhorse like a GMC 3500, Chevy Suburban, or an S10 Blazer, you know they’re built to last. But when the central computer—the Powertrain Control Module (PCM)—starts to fail, it can cause some of the most frustrating and difficult-to-diagnose problems I see in my shop. Your dependable truck can quickly become an unreliable mystery, leaving you stranded or chasing phantom issues with a parts cannon.

Common Signs of a Failing 1997 GM PCM

Over my 20+ years turning wrenches, I’ve learned to spot the signature symptoms of a bad PCM in these specific GM models. The issues often seem random, which can mislead even experienced mechanics. Look out for:

• ✔ An engine that cranks but won’t start, with no clear reason.
• ✔ Sudden stalling while driving, especially after the engine warms up.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ The check engine light is on with communication error codes (like U-codes) or multiple, unrelated sensor codes.
• ✔ Poor fuel economy or a noticeable loss of engine power.
• ✔ The anti-theft or security light stays on, preventing the engine from starting.

“A customer’s 1997 Chevy C1500 came in last week with these exact symptoms. It had a persistent no-start condition that two other shops couldn’t solve. They had replaced the fuel pump and ignition module. After hooking up my scan tool, I found there was no communication with the PCM. A quick voltage check at the PCM connectors confirmed it had power and ground, but the module itself was dead. The internal processors, after nearly three decades of heat cycles in the engine bay, had finally given up. This is a textbook failure for these units.”

The Technician’s Perspective: Why These PCMs Fail

The PCM in your 1997 GM vehicle is essentially the brain of the operation. It’s a metal box, usually mounted on the driver’s side of the engine compartment, that constantly processes information to control fuel injection, spark timing, and transmission behavior. After decades of service, the electronic components inside—capacitors, resistors, and processors—are susceptible to failure from constant vibration and extreme temperature swings. This degradation can lead to short circuits, open circuits, or complete processor failure, causing the confusing symptoms you’re experiencing.

Your Direct-Fit, Programmed Solution: Part Number 16229684

This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a reliable PCM, part number 16229684 (or compatible alternate 8162296840), and flash it with the latest GM-certified software specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) after you place your order.

Why is VIN Programming Essential?

• ✔ Guaranteed Functionality: Programming ensures the PCM has the correct information about your truck’s engine, transmission, and options, allowing it to work seamlessly.
• ✔ No Dealer Visit Needed: You avoid the hassle and high cost of having a dealership program a blank module. This saves you time and hundreds of dollars.
• ✔ Plug-and-Play Installation: Once it arrives, you can install it directly. In most cases, no complicated relearn procedures are required.

Simple Installation to Get You Back on the Road

Replacing the PCM on these trucks is a job most DIYers can handle with basic tools.

1. Disconnect the Battery: Always disconnect the negative battery terminal first for safety.
2. Locate the PCM: It’s typically in the engine compartment on the driver’s side, near the battery or firewall.
3. Swap the Modules: Carefully unplug the large electrical connectors (they have locking tabs) and unbolt the old module. Bolt the new one in its place and securely reconnect the harnesses.
4. Reconnect Battery: Reattach the negative battery terminal.

Start the vehicle and let it idle for a few minutes to allow the systems to sync. Your check engine light should be off, and the performance issues should be resolved.

Guaranteed To Fit Your 1997 GM Vehicle

This module is the correct replacement for a wide range of 1997 gasoline-powered Chevrolet and GMC trucks, vans, and SUVs. Please verify your part number or match your vehicle from the list below to ensure compatibility.

• ✔ Astro / Safari (GMC) Van: 1997 (Located LH front by battery)
• ✔ Blazer S10 / Jimmy S15: 1997 (with 4.3L V6)
• ✔ Bravada: 1997 (with 4.3L V6)
• ✔ Chevrolet / GMC 1500, 2500, 3500 Pickup: 1997 (Gasoline, LH front engine compartment)
• ✔ Express / Savana 1500, 2500, 3500 Van: 1997 (Gasoline)
• ✔ Isuzu Hombre: 1997 (with 4.3L V6)
• ✔ S10 / S15 / Sonoma Pickup: 1997 (with 4.3L V6)
• ✔ Suburban 1500 / 2500: 1997 (Gasoline, LH front engine compartment)
• ✔ Tahoe / Yukon: 1997 (Gasoline, LH front engine compartment)