Bring Your GM Truck Back to Life with a Reliable, Programmed PCM
Is your trusty 1998 Chevy S10, GMC Sonoma, or another GM truck from that era suddenly giving you headaches? If you’re dealing with a persistent check engine light, rough idling, stalling, or erratic transmission shifting, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle’s engine and transmission, when the PCM falters, the entire vehicle’s performance suffers. This isn’t just an annoyance; it can be a safety issue and will certainly cause you to fail an emissions test.
This isn’t just a replacement part; it’s a complete solution. We take the guesswork and high dealership costs out of the equation. By providing us with your vehicle’s VIN, you receive a PCM that is professionally flashed with the latest, most stable software updates from General Motors. This ensures your engine and transmission operate exactly as the manufacturer intended, restoring lost power, fuel economy, and reliability. It’s the definitive fix for a wide range of electronic issues plaguing these otherwise dependable trucks and vans.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 1998 GMC Jimmy that came into my shop a few years back. The owner was at his wit’s end. He’d replaced the fuel pump, spark plugs, and wires, but the truck still had this intermittent, terrifying issue where it would completely die at a stoplight. No codes, no warning. After checking all the grounds and power feeds to the PCM, I noticed that wiggling the main connector would sometimes cause the engine to stumble. We swapped in one of these VIN-programmed PCMs, and the problem vanished instantly. The original unit had a hairline crack in an internal solder joint that only opened up under specific temperatures—a classic failure mode for these modules. This simple swap saved the customer hundreds in further diagnostic fees and gave him his reliable daily driver back.
Is Your Truck or Van Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, a faulty engine computer is a likely culprit:
- ✔ Check Engine Light is illuminated with communication-related codes (like P0601, P0605) or multiple, unrelated sensor codes.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling, especially when the engine is warm.
- ✔ Poor fuel economy and a noticeable loss of power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle with basic hand tools. Our VIN-specific programming makes it a true plug-and-play process with no additional security relearn procedures typically needed for these models.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most S10/Sonoma/Blazer models, the PCM is located on the passenger side of the engine compartment, near the firewall or inner fender. On full-size trucks and vans, it’s typically on the driver’s side inner fender.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors. They have locking tabs, so be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a couple of small bolts.
- Install the New Module: Bolt your new, pre-programmed PCM into the mounting bracket.
- Reconnect Everything: Firmly plug the harness connectors back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Turn the key to the ‘On’ position for 10-15 seconds before starting the engine. This allows the system to initialize. Start your vehicle and enjoy its restored performance!
Verified Vehicle Compatibility
This module, identified by part number 16250279 (and interchangeable with 09366810, 09355699), is a direct-fit replacement for a wide range of GM vehicles. Please match your part number or vehicle from the list below to ensure compatibility. Remember, providing your VIN is essential for correct programming.
ASTRO (98-99), BLAZER S10 (98), C/K PICKUP 1500/2500/3500 (98-99), EXPRESS VAN 1500/2500/3500 (98), S10 PICKUP (98), SUBURBAN (98-99), TAHOE (98-99)
GMC:
ENVOY (98), JIMMY S15 (98), C/K PICKUP 1500/2500/3500 (98-99), SAFARI (98-99), SAVANA VAN 1500/2500/3500 (98), SONOMA S15 (98), YUKON (98-99)
CADILLAC:
ESCALADE (99)
OLDSMOBILE:
BRAVADA (98)
ISUZU:
HOMBRE (98)
Note: Specific options like engine size or build dates may apply. Cross-referencing the ID number on your original module is the best way to confirm fitment.
Frequently Asked Questions
How do I provide my VIN number?
After completing your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it.
Is this truly a plug-and-play part?
Yes. For the vehicles listed, once we program the module with your VIN, it is ready to be installed without requiring a trip to the dealer for additional programming or security procedures.
What if the part number on my old module is 09366810?
That’s no problem. This module, part number 16250279, is the correct, interchangeable service replacement for 09366810 and 09355699. It will function identically.
What happens if I don’t replace a failing PCM?
Continuing to drive with a faulty PCM can lead to severe engine or transmission damage, catalytic converter failure from unburnt fuel, and leave you stranded. It’s a critical component that should be replaced promptly.
Does this 1998 S10 Powertrain Control Module come with a warranty?
Yes, all our modules come with a warranty. Please see the warranty tab on this listing for complete details and duration. We stand behind the quality of our parts and programming service.