Is Your Truck Experiencing Engine Problems?
The Powertrain Control Module, or PCM, is the electronic brain of your 1997-2000 Chevrolet S10, GMC Sonoma, or Isuzu Hombre. It controls everything from fuel mixture and ignition timing to transmission shift points and emissions equipment. When this critical component begins to fail, it can cause a wide range of confusing and frustrating issues that can make your vehicle unreliable or even undrivable. A failing PCM doesn’t just trigger a check engine light; it degrades performance, hurts fuel economy, and can leave you stranded.
From the Diagnostic Bay
We once had a ’99 Sonoma with the 2.2L that would randomly stall at stoplights. There were no codes and no warning. Fuel pressure was solid, the ignition components were new, and all sensor data looked normal on the scan tool. After hours of chasing wires and testing components, we swapped in a known-good PCM from another truck. The problem vanished instantly. The original module had an internal thermal fault that only acted up when it reached operating temperature—a classic, hard-to-diagnose failure mode for these units.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) that won’t clear
- ✔ Engine stalling for no apparent reason, especially when warm
- ✔ Rough or erratic idling
- ✔ Noticeable decrease in fuel mileage
- ✔ Engine cranks but refuses to start (no-start condition)
- ✔ Harsh or delayed automatic transmission shifting
- ✔ Failure to communicate with diagnostic scan tools
- ✔ Misfire codes (like P0300) even after replacing plugs and wires
The Direct-Fit, Programmed Solution for Your Vehicle
Don’t let a faulty computer keep your truck off the road. This Powertrain Control Module is the definitive solution for the issues listed above. We take the guesswork out of the repair by pre-programming the module specifically for your vehicle using the VIN you provide. This ensures that all factory settings, engine parameters, and security information are correct right out of the box. We load the latest available GM software updates, which can often resolve underlying drivability concerns that were present even before your original module failed. This is not a generic, one-size-fits-all part; it’s a component prepared for your specific 1997-2000 S10 PCM requirements.
This module is a direct replacement for service numbers 16228016, 8162280160, and 16245305, and fits a wide range of GM vehicles from that era, including the Chevrolet Cavalier, Pontiac Sunfire, Oldsmobile Achieva, and Buick Skylark. Please verify the fitment list to ensure compatibility. Installation is straightforward, and once the security relearn procedure is completed, your vehicle will be back to its reliable, factory-specified operation.
Frequently Asked Questions
Do I need to program this module?
No. We program the module to the VIN you provide before shipping. It arrives ready for installation and a security relearn procedure, which you can typically do yourself without special tools.
Where is the PCM located on my S10/Sonoma?
On the 1997-2000 S10, Sonoma, and Hombre, the PCM is typically located in the engine compartment on the right-hand (passenger) side, often near the firewall or inner fender.
What is a security or CASE relearn, and will I need one?
After installation, you will need to perform a security relearn (also known as a Passlock or VATS relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle three times. A CASE (Crankshaft Angle Sensor Error) relearn may be required to prevent a P1336 code, which requires a capable scan tool.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information.
Is this part difficult to install?
Installation is generally simple for someone with basic mechanical skills. It involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and then installing the new one in the reverse order. The most important part is the security relearn procedure afterward.
Does this part fit vehicles other than the S10?
Yes. This PCM is compatible with a wide range of GM vehicles from the late 90s, including the Isuzu Hombre, Chevy Cavalier, Pontiac Sunfire, Pontiac Grand Am, Chevy Malibu, Buick Skylark, and Oldsmobile Achieva with the 2.2L or 2.4L engine. Please check the detailed fitment list on this page to confirm for your specific model and year.