Restore Your Truck’s Brain and Get Back on the Road
Is your reliable GMC or Chevy truck suddenly giving you headaches? Stalling at stoplights, hard starting, or a persistent Check Engine Light can often point to one culprit: a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its health is critical. This isn’t just a part; it’s the command center. We offer a dependable, cost-effective solution with this quality used PCM, professionally programmed to your truck’s specific Vehicle Identification Number (VIN).
Case Study: A Tricky Diagnosis
I remember a ’99 Silverado 2500 that came into my shop. The owner was frustrated. He’d replaced the fuel pump and spark plugs, but it still had an intermittent no-start condition and would sometimes stall while driving. The scan tool showed a P0601 ‘Internal Control Module Memory Check Sum Error.’ This code is a dead giveaway. Instead of a costly trip to the dealer for a new module and programming fees, we installed one of our VIN-programmed used PCMs. After a quick security relearn, the truck fired right up and ran perfectly. This is the exact fix we provide, saving you time, money, and diagnostic guesswork.
Why a Pre-Programmed PCM is the Smart Choice
Replacing a PCM isn’t just about swapping a box. A new, unprogrammed module is a blank slate; it won’t work until it’s been initialized by a dealership or a shop with expensive tools. Our process eliminates that entire step. By providing your VIN during checkout, you receive a 1998-1999 GMC 2500 PCM that is ready for installation right out of the box. We flash it with the latest official GM software updates, which can often resolve factory bugs and improve performance and efficiency. It’s the most direct path to getting your truck running right again.
Is Your Truck Showing These Symptoms?
A failing PCM can cause a wide range of confusing issues. If you’re experiencing any of the following, your engine computer is a likely suspect:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0605, or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough or erratic idling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ The vehicle stalls unexpectedly while driving or at idle.
A Straightforward Guide to Installation
You don’t need to be a master mechanic to install this part. With basic hand tools, you can get the job done in your own driveway. After installation, you will need to perform a simple security relearn procedure, which takes about 30 minutes and requires only your key.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- 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.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs, so be gentle. Then, unbolt the module from its bracket.
- Install the New Module: Bolt the replacement PCM into place and securely reconnect all wiring harnesses. Make sure they click into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. On the fourth try, the vehicle should start and run, with the security system synced to the new PCM.
This simple process for your 1998-1999 GMC 2500 PCM saves you a tow to the shop and expensive labor charges.
Verified Vehicle Compatibility
This module is a direct replacement for several part numbers and fits a wide range of General Motors vehicles. Please verify your original part number or match your vehicle from the list below. This unit is compatible with service numbers 09355699, 16266645, 16250279, 16258815, and 09366810.
This ECM fits the following vehicles (all with ID 9355699):
- ✔ 1998-1999 Chevrolet & GMC 1500, 2500, 3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Suburban & Tahoe (Gasoline)
- ✔ 1998-1999 GMC Yukon
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Oldsmobile Bravada, Chevrolet S10, GMC Sonoma, Isuzu Hombre (4.3L)
- ✔ 1998 Chevrolet Blazer & GMC Jimmy (4.3L)
Frequently Asked Questions
1998-1999 GMC 2500 PCM
Will this fix my specific problem?
This will correct issues directly caused by a faulty computer, such as internal memory errors (P0601), no-start conditions, or erratic engine behavior. While it solves many common problems, you should always ensure your vehicle has been properly diagnosed.