Programmed 1998 S10 Sonoma PCM 09366810 | Plug & Play Replacement

Restore Peak Performance to Your GM Truck or Van

Is your trusty Chevrolet, GMC, or Isuzu suddenly giving you headaches? If you’re dealing with frustrating issues like a persistent Check Engine Light, rough idling, stalling, or a no-start condition, the problem often traces back to a failing Powertrain Control Module (PCM). As the electronic brain of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shifting. When it falters, the entire vehicle’s performance suffers. I’ve seen it hundreds of times in my shop: a great truck sidelined by a faulty computer.

This isn’t just a replacement part; it’s a complete solution. We provide a high-quality PCM, part number 09366810, that is professionally programmed with the latest official GM software updates. All we need is your vehicle’s VIN. This critical step ensures the module communicates perfectly with your truck’s specific systems, eliminating the need for an expensive trip to the dealership for programming. You get a reliable part that’s ready to install right out of the box, getting you back on the road with confidence.

Is Your Truck Showing These Telltale Signs?

A failing PCM can cause a wide range of confusing symptoms. If you’re experiencing any of the following, this module is the likely solution:

• ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0604, or P0606 (Internal Module Failure).
• ✔ Vehicle refuses to start or is very difficult to start.
• ✔ Rough or erratic engine idle.
• ✔ Unexplained stalling while driving or at a stop.
• ✔ Poor fuel economy.
• ✔ Harsh or incorrect automatic transmission shifting.
• ✔ Failure to pass an emissions/smog test.

Your Straightforward Installation Guide

Installing your new 1998 S10 Sonoma PCM is a manageable job for a DIYer. Follow these steps carefully for a smooth installation.

1. Safety First: Always 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 bay, either on the driver’s side inner fender or the passenger’s side firewall/fender area.
3. Disconnect Connectors: Carefully unclip and remove all wiring harness connectors from the old PCM. These connectors are color-coded, making reinstallation easy. Avoid forcing them.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
5. Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure the bolts.
6. Reconnect Everything: Plug the wiring harnesses back into the correct slots on the new PCM. Reconnect the negative battery terminal.
7. Perform Security Relearn (CRITICAL): Your vehicle’s anti-theft system (Passlock/VATS) needs to sync with the new PCM. Turn the key to the ‘ON’ position (don’t start) for 10-15 minutes, or until the ‘Security’ light stops flashing and turns off. Turn the key off for 10 seconds, then the vehicle should start normally.

Verified Fitment for Your GM Truck or Van

This module is a direct replacement for service part numbers 09366810, 16250279, 09355699, and 16258815. Please verify the part number on your original module before ordering. It is guaranteed to fit the following vehicles:

• ✔ 1999 Cadillac Escalade
• ✔ 1998-1999 Chevrolet & GMC 1500/2500/3500 Pickups (Gasoline)
• ✔ 1998-1999 Chevrolet Astro & GMC Safari Vans
• ✔ 1998-1999 Chevrolet & GMC Suburban (Gasoline)
• ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
• ✔ 1998 Chevrolet Express & GMC Savana 1500/2500/3500 Vans (Gasoline)
• ✔ 1998 Chevrolet S10 Blazer & GMC S15 Jimmy (4.3L)
• ✔ 1998 Chevrolet S10 & GMC Sonoma Pickup (4.3L)
• ✔ 1998 Oldsmobile Bravada (4.3L)
• ✔ 1998 GMC Envoy (4.3L)
• ✔ 1998 Isuzu Hombre (4.3L)

Note: For 1998 S-series trucks/SUVs (S10, Jimmy, Blazer, Sonoma, Bravada, Envoy, Hombre), fitment is for models without build date option ZN4.