Is Your 1997 GM Truck or Van Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, or a no-start condition in your 1997 GMC Safari, Chevy Astro, S10, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shifting and emissions controls. When it fails, it can cause a cascade of problems that are difficult to diagnose and can leave you stranded.
This replacement PCM, part number 8162296840 (also compatible with 16229684), is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This ensures that it arrives ready for installation, loaded with the latest factory software updates from GM for optimal engine and transmission function.
From the Diagnostic Bay
I remember a 1997 Chevy S10 with the 4.3L V6 that came into the shop on a tow truck. It would crank but wouldn’t start, and there was no communication with the scan tool. The owner had already replaced the fuel pump and ignition module, convinced the PCM was the last resort. Before condemning the module, we did a voltage drop test on the main power and ground circuits at the PCM connectors. We found a heavily corroded ground wire on the frame rail right below the battery tray. After cleaning the connection point to bare metal, the truck fired right up. While a faulty PCM was a strong possibility, this case was a classic reminder: always verify the PCM has good power and clean grounds before replacement. It can save you hundreds of dollars and a lot of frustration.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh, erratic, or delayed transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire.
- ✔ Drastically reduced fuel economy.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Inability to pass state emissions testing due to readiness monitor issues.
The Plug-and-Play Solution for Your 1997 GMC Safari PCM
Don’t settle for a generic, unprogrammed module that will require an expensive trip to the dealership. Our process is simple and designed for the DIY mechanic or professional shop. Once you place your order, we will contact you for your VIN. Our technicians then use this number to flash the module with the precise operational software for your truck’s engine, transmission, and factory options. This VIN-matching service ensures seamless integration and restores the original performance and efficiency of your vehicle. In most cases, the only additional step is a simple security relearn procedure that you can do yourself in your driveway with just the ignition key.
Simple Installation Process
- ✔ Locate the Module: On most of these 1997 models, the PCM is located in the engine compartment on the driver’s side, near the battery or firewall.
- ✔ Disconnect Power: Always disconnect the negative battery terminal before beginning work.
- ✔ Swap the Modules: Carefully unplug the wiring harness connectors and unbolt the old module. Install the new module in its place and securely reconnect the harnesses.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Security Relearn (if needed): For vehicles with GM’s VATS or Passlock security systems, a relearn is necessary. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. We provide clear instructions for this simple procedure.
Guaranteed Fitment
This module is a direct replacement for a wide range of popular 1997 GM trucks, vans, and SUVs. Please verify your part number (16229684 or 8162296840) and check the compatibility list below:
- 1997 Astro / Safari (GMC)
- 1997 Blazer S10 / Jimmy S15 (4.3L)
- 1997 Bravada (4.3L)
- 1997 Chevrolet & GMC 1500/2500/3500 Pickups (Gasoline)
- 1997 Express & Savana 1500/2500/3500 Vans (Gasoline)
- 1997 Isuzu Hombre (4.3L)
- 1997 S10/S15/Sonoma (4.3L)
- 1997 Suburban 1500/2500 (Gasoline)
- 1997 Tahoe / Yukon (Gasoline)
Frequently Asked Questions
What happens after I place my order?
After you purchase the PCM, we will require your vehicle’s 17-digit VIN. You can provide this during checkout or we will contact you for it. Once we have your VIN, we will program the module with the latest GM software specific to your vehicle and ship it out to you.
Is this module truly plug-and-play?
Yes, it is delivered fully programmed to your VIN. However, many 1997 GM vehicles have an anti-theft system (VATS/Passlock) that requires a simple ‘relearn’ procedure to sync the new PCM to your key. We provide easy-to-follow instructions for this process, which does not require any special tools.
How can I be sure my old PCM is faulty?
The symptoms listed on this page are strong indicators of a failing PCM. However, we always recommend a full diagnosis by a qualified technician. Be sure to check all power and ground connections to the module and rule out sensor or wiring issues before ordering a replacement.
Do I need to send my old computer back?
No, there is no core charge for this part. You can keep your old module or recycle it locally.
Will this fix my check engine light for emissions?
If the check engine light and emissions failure are caused by an internal fault in the old PCM, this replacement will resolve the issue. After installation, you will need to complete a drive cycle to allow the vehicle’s readiness monitors to reset before it can pass an emissions test.