Programmed 1998 S10 Sonoma PCM 16250279 | Engine Computer

Restore Your Truck’s Brain and Get Back on the Road

Is your trusty 1998 Chevy S10, GMC Sonoma, or another GM truck giving you headaches? If you’re dealing with frustrating issues like stalling, a no-start condition, erratic shifting, or a persistent Check Engine Light, the problem often traces back to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shift points. When it fails, your vehicle’s performance and reliability suffer dramatically.

This isn’t just a replacement part; it’s a complete, ready-to-install solution. We are offering a genuine, used OEM PCM that has been thoroughly inspected and is ready for service. The real value comes from our in-house programming service. Before we ship it, we flash the module with the latest GM-certified software updates and program it specifically to your vehicle’s VIN. This ensures perfect compatibility and function, eliminating the need for an expensive trip to the dealership for programming. This is the most direct and cost-effective way to fix complex electronic issues and restore your truck’s original performance.

Is Your GM Truck Showing These Symptoms?

• ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module ROM Error).
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained stalling, especially when the engine is warm.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Noticeable decrease in fuel economy.
• ✔ Communication errors with diagnostic scan tools.
• ✔ Misfires or rough idling that can’t be traced to spark plugs or coils.

A Straightforward Guide to Installation

1. ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
2. ✔ Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s or passenger’s side fender well or near the battery.
3. ✔ Disconnect Connectors: Carefully unlatch and remove the electrical wiring harnesses from the old PCM. Inspect the connectors for any corrosion or damage.
4. ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held in by a few 10mm bolts.
5. ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
6. ✔ Reconnect Everything: Plug the wiring harnesses back into the new module until they click firmly into place. Reconnect the negative battery terminal.
7. ✔ Perform Security Relearn (If Necessary): For many GM vehicles of this era, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the vehicle’s anti-theft system to recognize the new PCM. Your truck should then start normally.

Verified Vehicle Compatibility

This module, identified by service number 16250279 or 09355699, is a direct-fit replacement for a wide range of GM vehicles. It is compatible with the following part numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Please verify your part number and check the list below to ensure a perfect match for your truck or van. This programmed 1998 S10 Sonoma PCM is a versatile solution for many models.

Fits select 1998-1999 models including: Chevrolet/GMC C/K 1500/2500/3500 Pickups, Suburban, Tahoe, Yukon, Express/Savana Vans, Astro/Safari Vans, S10/S15/Sonoma, Blazer/Jimmy, Oldsmobile Bravada, Cadillac Escalade, and Isuzu Hombre. Crucially, your original module must have the hardware ID 9355699.