Is Your 1997 GM Truck or Van Running Poorly?
If you’re dealing with frustrating issues like a persistent check engine light, stalling, poor fuel mileage, or a no-start condition in your 1997 Chevrolet Express 1500, the problem may lie with the heart of your vehicle’s electronics: the Powertrain Control Module (PCM). As the central computer, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting. When it begins to fail, it can cause a wide range of confusing and difficult-to-diagnose symptoms, leaving you stranded and spending money on parts you don’t need.
From the Diagnostic Bay
We recently had a 1997 GMC Yukon come into the shop with a classic intermittent no-start problem. The owner had already replaced the fuel pump and ignition control module, but the issue persisted. After confirming fuel pressure and spark were good when it *did* run, we connected a diagnostic scope. We found that the PCM was intermittently failing to send the command signal to the fuel injectors. It wasn’t a wiring issue; the computer itself was failing internally. We installed a VIN-programmed PCM, performed the security relearn, and the truck fired up perfectly every time. It’s a crucial reminder that the PCM is the master controller, and its failure can mimic many other component issues.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The light stays on, often with communication error codes (U-codes) or multiple, seemingly unrelated sensor codes.
- ✔ Engine Performance Problems: You may experience rough idling, hesitation during acceleration, reduced power, and a noticeable drop in fuel economy.
- ✔ No-Start or Intermittent Start: The engine cranks but refuses to start, or it may start fine one day and not the next. This is a classic sign of PCM failure.
- ✔ Erratic Transmission Shifting: The PCM also controls transmission functions. You might notice harsh shifts, delayed engagement, or the transmission getting stuck in one gear (limp mode).
- ✔ Failed Emissions Test: A faulty PCM can prevent the engine from running efficiently, leading to an automatic failure at the emissions station.
The Direct Solution: A VIN-Programmed 1997 Express 1500 PCM
Don’t settle for a used module from a salvage yard that won’t be compatible with your vehicle’s specific options and security system. This Powertrain Control Module is the definitive solution for your vehicle. We take the guesswork out of the repair by programming the unit specifically for your truck or van using the VIN you provide. This critical step ensures that the module is a 100% match for your factory settings and has the latest available software updates from General Motors. This isn’t just a replacement part; it’s a fully prepared component engineered to restore your vehicle’s original performance and reliability. By installing our pre-programmed 1997 Express 1500 PCM, you bypass the need for expensive dealership programming and complex diagnostic tools.
Guaranteed Compatibility
This module, part number 8162296840 (also compatible with 16229684), is the correct fit for a wide range of 1997 GM gasoline-powered trucks and vans, including:
- Chevrolet Express & GMC Savana (1500, 2500, 3500)
- Chevrolet & GMC Pickups (1500, 2500, 3500)
- Chevrolet Tahoe & GMC Yukon
- Chevrolet Suburban (1500, 2500)
- Chevrolet S10, GMC Sonoma, Isuzu Hombre (4.3L V6)
- Chevrolet Blazer, GMC Jimmy, Oldsmobile Bravada (4.3L V6)
- Chevrolet Astro & GMC Safari
Simple Installation Process
Replacing the PCM is a straightforward job. Simply disconnect the vehicle’s battery, locate the module in the engine compartment (typically on the driver’s side), disconnect the electrical harnesses, and unbolt the old unit. Install the new one in its place. After installation, you will need to perform a simple security relearn procedure to synchronize the new module with your keys. This process requires no special tools and typically involves a sequence of key turns that takes about 30 minutes to complete. Instructions are readily available online for the GM Passlock/VATS relearn procedure.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information, as the programming is essential for the module to function in your vehicle.
Is this part truly plug-and-play?
Almost. The module arrives programmed to your VIN and is ready to be installed. However, you must perform a security relearn procedure after installation to sync the module with your vehicle’s anti-theft system. This is a simple process that does not require a mechanic or special tools.
What is the security relearn procedure?
The GM security relearn (often for the Passlock or VATS system) involves a series of key-on/key-off cycles. A common method is to turn the key to the ‘ON’ position for 10-12 minutes until the security light goes out, turn it off for 30 seconds, and repeat the cycle two more times. This allows the new PCM to recognize your vehicle’s keys.
Where is the PCM located on my 1997 Express Van?
On most 1997 GM trucks and vans, including the Express and Savana, the PCM is located in the engine compartment on the driver’s side, often near the battery or firewall.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a failing PCM, this part is the correct solution. However, we always recommend a proper diagnosis to confirm the PCM is the root cause before ordering, as other faulty sensors or wiring issues can sometimes cause similar problems.