Restore Peak Performance to Your GM Truck or Van
Is your trusty 1998-1999 GMC 2500 Pickup suddenly running rough, refusing to start, or showing a persistent Check Engine Light? Before you start throwing expensive parts at the problem, the issue could be the very brain of your engine: the Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen countless GM vehicles from this era sidelined by a failing PCM. This isn’t just a part; it’s the central command center for your engine’s fuel delivery, ignition timing, and transmission shifts. When it fails, your reliable workhorse can become a frustrating puzzle.
We offer a straightforward, reliable solution. This is a quality-tested, used OEM PCM that we program specifically for your vehicle using your VIN. This critical step ensures that all factory settings and the latest GM software updates are loaded, making the installation process as simple as possible. You get a dependable part that restores original functionality without the high cost and hassle of a dealership visit for programming. This is the smart, efficient way to get your truck back on the road and running strong.
Case Study: A Tricky Diagnosis
I remember a ’99 Chevy Suburban that came into the shop with a list of complaints: intermittent stalling at stoplights, hard shifting from first to second, and a check engine light that would come and go. The owner had already replaced the fuel pump and a few sensors. Our initial scan showed a handful of seemingly unrelated communication codes. After checking the wiring harness for a solid 90 minutes, we decided to test the PCM. We hooked up a known-good unit, and like magic, all the problems vanished. The original PCM had internal circuit failure, causing it to send faulty signals across the vehicle’s network. A pre-programmed replacement like this one had the Suburban running perfectly in under 15 minutes—a fix that saved the customer hundreds in further diagnostic guesswork.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, your engine’s computer may be the culprit. This is especially true if you’ve scanned for codes and found internal processor faults.
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drop in fuel economy.
- ✔ Rough idling or stalling for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ Loss of communication with your diagnostic scan tool.
A Straightforward Guide to Installation
One of the biggest benefits of our pre-programmed 1998-1999 GMC 2500 PCM is the ease of installation. Since the programming is done before we ship, you can avoid a trip to the dealer. While some vehicles may require a simple security relearn procedure (which you can do yourself), the physical swap is very direct.
- 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 GM trucks and vans, 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 PCM. Inspect the pins for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely re-attach the wiring harness connectors. You should hear a ‘click’ as they lock in place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position for 10 seconds before starting the engine to allow the system to initialize. Start your vehicle and check for proper operation.
Will This Fit My Vehicle?
This PCM is a direct fit for a wide range of GM vehicles. Please verify your part number (located on the PCM’s sticker) matches one of the numbers below. This module, identified by service ID 9355699, is compatible with the following models:
Compatible Vehicles:
- 1998-1999 Chevrolet/GMC 1500, 2500, & 3500 Pickups (Gasoline)
- 1998-1999 Chevrolet/GMC Suburban 1500 & 2500 (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon
- 1999 Cadillac Escalade
- 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, & 3500 Vans (Gasoline)
- 1998 Chevrolet Astro & GMC Safari
- 1998 Oldsmobile Bravada
- 1998 GMC Envoy
- 1998 Chevrolet S10 / GMC S15/Sonoma (4.3L V6)
- 1998 Chevrolet Blazer S10 / GMC Jimmy S15
- 1998 Isuzu Hombre (4.3L V6)
Note: Please match the ID number 9355699 from your original module to ensure perfect compatibility.
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship the module until we receive this information, as the programming is essential for it to function in your truck.
Is this part new?
No, this is a high-quality, tested computer that has been sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
Will I need to do anything else after installation?
In most cases, the module is plug-and-play. However, some GM vehicles of this era have a Passlock/Passkey anti-theft system that may require a simple security relearn procedure. This can typically be done in your driveway in about 30 minutes with just the ignition key—no special tools are needed.
What if my part number is slightly different?
This PCM, identified by service ID 9355699, replaces several part numbers. Please check the list of interchangeable numbers provided. If your number is on that list, this module will work for your vehicle once programmed to your VIN.
Why is a programmed 1998-1999 GMC 2500 PCM a better choice?
Buying a pre-programmed module saves you significant time and money. An unprogrammed unit from a dealer or parts store would require towing your vehicle to a shop with expensive scan tools for flashing, often costing hundreds of dollars extra.