Restore Your Truck’s Brain and Get Back on the Road
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, or a no-start condition in your GMC Sierra or other GM truck, a failing Powertrain Control Module (PCM) is often the culprit. 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 truck’s reliability and performance suffer. This isn’t just an inconvenience; it can leave you stranded. This replacement PCM is the dependable, straightforward solution to get your workhorse running like it should.
From the Diagnostic Bay
I remember a 1999 Chevy Suburban that came into my shop. The owner was at his wit’s end. It had an intermittent stalling problem that no one could pin down. It would run fine for days, then die at a stoplight without warning. The scan tool showed a P0601 (Internal Control Module Memory Check Sum Error) but only sporadically. After checking all the wiring and grounds—which is always the first step—we swapped in a known-good PCM. The problem vanished instantly. Those internal board failures can be tricky, causing ghost-like issues. A quality, correctly programmed module isn’t just a part; it’s peace of mind.
The Simple, Reliable Solution for Your GM Truck
Forget expensive dealership visits and the hassle of finding a shop that can program a new module. We handle the critical step for you. When you purchase this module, we will flash it with the latest official GM software updates, specifically matched to your vehicle’s VIN. This ensures that all factory parameters for your engine and transmission are perfectly calibrated. This isn’t a generic, one-size-fits-all part; it’s a precise component prepared for your exact 1998-1999 GMC 2500 PCM requirements, restoring original performance and efficiency.
Is Your Truck Showing These Signs?
- ✔ Persistent Check Engine Light (CEL) with codes like P0601, P0605, or other communication errors.
- ✔ Engine cranks but refuses to start.
- ✔ Rough or unstable idling.
- ✔ Poor acceleration and overall loss of power.
- ✔ Decreased fuel economy for no apparent reason.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Intermittent stalling or cutting out while driving.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the PCM: On most of these GM trucks and SUVs, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- ✔ Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old module. They have locking tabs that may need to be gently pried up.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few small bolts.
- ✔ Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely re-fasten the bolts.
- ✔ Reconnect Everything: Firmly plug the wiring harness connectors into the new PCM 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. Your truck is now ready to go!
Verified Vehicle Compatibility
This module, identified by part number 16250279 (and interchangeable with 09366810, 09355699, and 16258815 in some applications), is a direct-fit replacement for a wide range of GM vehicles. Please match your original part number or verify fitment by your vehicle’s make, model, and year. It fits gasoline models including:
- Cadillac Escalade (1999)
- Chevrolet/GMC Pickups (1500, 2500, 3500) (1998-1999)
- Chevrolet/GMC Suburban & Tahoe/Yukon (1998-1999)
- Chevrolet Astro & GMC Safari Vans (1998-1999)
- Chevrolet Express & GMC Savana Vans (1998)
- Chevrolet S10 Blazer / GMC S15 Jimmy / Oldsmobile Bravada / GMC Envoy (1998)
- Chevrolet S10 / GMC Sonoma / Isuzu Hombre Pickups (1998)
Frequently Asked Questions
What do I need to do after I install this PCM?
In most cases, no further action is needed. Because we program the module to your VIN before shipping, it is ready for installation. On some models, a security relearn procedure (often called CASE relearn) may be required, which can typically be done without special tools. Instructions are readily available online for this simple process.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
How do I provide my VIN after purchase?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot program and ship your module until we receive this information, so please provide it promptly to avoid delays.
Will this fix my transmission shifting problems?
Yes, in many cases it can. The PCM controls the transmission’s electronic solenoids and shift logic. If the module is failing, it can cause hard shifting, slipping, or delayed engagement. This part can resolve those issues if the PCM is the root cause.
Is this a guaranteed fix for my vehicle’s problem?
This module will fix your issue if the PCM has been correctly diagnosed as the faulty component. It is essential to rule out other potential causes like bad sensors, damaged wiring, or fuel delivery problems before replacing the PCM.