Restore Your Truck’s Heartbeat with a Plug-and-Play PCM
Is your reliable GMC or Chevy truck suddenly giving you headaches? If you’re dealing with a persistent check engine light, erratic engine behavior, harsh shifting, or even a frustrating no-start condition, the culprit is often the Powertrain Control Module (PCM). As the brain of your vehicle’s engine and transmission, when it fails, it can cause a cascade of problems. This isn’t just an inconvenience; it affects your fuel economy, emissions, and overall drivability. We offer a dependable and straightforward solution: a genuine, used OEM PCM, professionally programmed to your truck’s specific Vehicle Identification Number (VIN).
From the Diagnostic Bay
I remember a 1999 Chevy Suburban that came into my shop. The owner had replaced plugs, wires, and even the fuel pump chasing an intermittent no-start and a random stalling issue. No codes were stored consistently. After hooking up my scope, I saw the 5-volt reference signal to the sensors dropping out randomly. This is a classic sign of a failing PCM capacitor. Instead of a costly new unit from the dealer, we installed one of these VIN-programmed modules. The truck fired up instantly and ran perfectly. It’s a fix I’ve performed hundreds of times on these GMT400 platform vehicles; it’s reliable, effective, and saves the customer a fortune.
Is Your Truck or Van Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s highly likely your engine computer is the root cause. Keep an eye out for these common diagnostic trouble codes (DTCs) as well.
- ✔ Check Engine Light is on with codes like P0601, P0605, or P0606 (Internal Module Failure).
- ✔ Vehicle refuses to start or starts intermittently.
- ✔ Poor or declining fuel economy.
- ✔ The transmission shifts harshly, late, or gets stuck in one gear (limp mode).
- ✔ Noticeable loss of engine power and performance.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
One of the biggest benefits of our service is that this 1998-1999 GMC 3500 PCM arrives ready to install. No dealership visit is required for programming. While professional installation is always an option, a confident DIYer can handle this job in under an hour.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the replacement PCM into place and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: 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. Turn the key off for 10 seconds, then the vehicle should start.
Verified Vehicle Compatibility
This module is a direct replacement for service number 9366810 and interchanges with several other part numbers. It is guaranteed to fit the following gasoline-engine vehicles with matching ID 09355699 or 16266645. Please verify the part number on your original module to ensure a perfect match.
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon
- ✔ 1998-1999 Chevrolet & GMC Suburban
- ✔ 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans
- ✔ 1999 Cadillac Escalade
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Oldsmobile Bravada
- ✔ 1998 Oldsmobile Envoy
- ✔ 1998 Chevrolet S10 & GMC Sonoma (4.3L)
- ✔ 1998 Chevrolet Blazer & GMC Jimmy (4.3L)
- ✔ 1998 Isuzu Hombre (4.3L)
This used 1998-1999 GMC 3500 PCM is a reliable and cost-effective way to get your workhorse back on the road. By providing us with your VIN, you receive a part that is not only physically compatible but also electronically matched to your vehicle’s specific configuration and equipped with the latest GM software updates.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific vehicle requires. This ensures proper engine, transmission, and emissions system operation, making the installation truly plug-and-play.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM (Original Equipment Manufacturer) computer sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new unit.
Will I need to do anything after I install it?
After physical installation, you will need to perform a simple security relearn procedure, which takes about 10-15 minutes and requires only your ignition key. We include instructions for this easy process.
Does this fix transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions, including shift points and line pressure. If your shifting issues are caused by a faulty computer, this part will correct them.
What if my part number is slightly different?
This module replaces several part numbers, including 09355699, 16266645, 16250279, 16258815, and 9366810. As long as your original module carries one of these numbers, this part is a compatible replacement.