Restore Peak Performance to Your 1997 GM Vehicle
Is your 1997 Chevrolet Express 3500, GMC Savana, or another compatible GM truck or van running poorly? You might be dealing with a failing Powertrain Control Module (PCM), the central computer responsible for managing your engine and transmission. A faulty PCM can lead to a cascade of frustrating issues, from poor fuel economy and rough idling to a complete no-start condition. This replacement PCM, part number 16229684, is the definitive solution to restore your vehicle’s reliability and drivability.
The PCM acts as the brain of your vehicle’s powertrain. It constantly analyzes data from sensors throughout the engine and transmission to make real-time adjustments to fuel delivery, ignition timing, and shift points. When it begins to fail, the signals become erratic or stop altogether, leaving your vehicle struggling to perform as it should. Symptoms can appear intermittently at first, but they will inevitably worsen over time, potentially leaving you stranded.
From the Diagnostic Bay
We had a 1997 GMC Yukon come into the shop with a classic complaint: it would run fine for about 20 minutes, then start stumbling and eventually stall. The owner had already replaced the fuel pump and ignition coil with no luck. After connecting our scanner, we noticed the injector pulse width was all over the place right before it would stall. While this pointed towards the PCM, we did one last check. We inspected the main ground wire from the engine block to the chassis. Sure enough, it was corroded and barely making contact. After cleaning the connection points and installing a new ground strap, the Yukon ran perfectly. This is a crucial reminder: before condemning a PCM, always verify your main power and ground connections are clean and tight. It can save you time and money.
Diagnosing a Failing 1997 Express 3500 PCM
Identifying a failing PCM can be tricky, as its symptoms often mimic other component failures. However, if you’re experiencing several of the issues below, your PCM is the most likely culprit. This module is the key to resolving persistent, hard-to-diagnose electronic problems in your 1997 GM vehicle.
Common Symptoms of a Bad PCM
- ✔ Check Engine Light is on with various communication or sensor-related trouble codes (e.g., U-codes, P0601-P0606).
- ✔ Engine cranks but refuses to start.
- ✔ Rough or erratic idling and frequent stalling.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or unpredictable automatic transmission shifting.
- ✔ Intermittent loss of power or hesitation during acceleration.
- ✔ Failure to pass emissions testing due to readiness monitor issues.
A Plug-and-Play Solution Programmed for Your Vehicle
Don’t settle for a generic, unprogrammed module that will require an expensive trip to the dealership. We take the guesswork and hassle out of the process. When you order this 1997 Express 3500 PCM, we will flash it with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This ensures that the module communicates perfectly with your vehicle’s specific configuration, including its engine, transmission, and emissions equipment.
This VIN-specific programming makes installation straightforward. In most cases, once the new module is installed, you will only need to perform a simple security relearn procedure (often called a CASE relearn or anti-theft relearn), which can typically be done without special tools. This gets you back on the road quickly and confidently, knowing your vehicle’s computer is operating on the most stable and efficient software available.
Frequently Asked Questions
Do I need to send my old PCM in?
No, there is no core charge or need to send your original module to us. This is a direct replacement unit that you purchase outright.
Is this PCM difficult to install?
The physical installation is typically simple. It’s located in the engine bay, usually on the driver’s side. You’ll need to disconnect the battery, unplug the electrical connectors, and unbolt the module. After installing the new one, you may need to perform a security relearn procedure, which varies by model but instructions can be readily found online.
What happens if I don’t provide my VIN?
We cannot ship your PCM until we receive your VIN. The programming is essential for the module to function in your vehicle. Please provide your 17-digit VIN during or after checkout to avoid delays.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your original PCM, then yes, this replacement will resolve the issue. However, if the light is on due to a faulty sensor or other component, you will still need to address that separate problem.
Is this compatible with my 1997 Chevy S10 with the 4.3L V6?
Yes, this PCM is compatible with a wide range of 1997 GM trucks and vans, including the S10/Sonoma with the 4.3L engine. Please see the full compatibility list on this page to confirm your specific model.