Programmed 1998-1999 Suburban 2500 PCM 16258815 | VIN Matched ECU

Restore Your Truck’s Performance and Reliability

Is your 1998-1999 Suburban 2500 acting up? If you’re dealing with frustrating issues like a no-start condition, a persistent Check Engine Light, erratic transmission shifting, or poor fuel economy, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty PCM can cripple these otherwise dependable GM trucks. This isn’t just a part; it’s the brain of your engine, and when it fails, nothing works right. This replacement PCM is your direct, cost-effective solution to get your truck back on the road and running strong.

We take the guesswork and hassle out of the repair. This is a quality, used OEM PCM that we flash with the latest official GM software updates specifically for your vehicle. All you have to do is provide us with your Vehicle Identification Number (VIN) after purchase, and we handle the programming. This means it arrives at your door ready to install, saving you a costly trip to the dealership for programming services. It’s the most efficient way to solve complex electronic issues and restore your vehicle’s factory performance.

Is Your Truck Showing These Symptoms?

A failing PCM can cause a wide range of problems. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs replacement. Look out for:

• ✔ No-start or hard-starting conditions.
• ✔ A persistent Check Engine Light.
• ✔ Diagnostic Trouble Codes (DTCs) stored, especially P0601, P0602, or P0605 (Internal Control Module Memory Errors).
• ✔ Poor or erratic automatic transmission shifting.
• ✔ A noticeable drop in fuel economy.
• ✔ Engine stalling, stumbling, or misfiring.
• ✔ Failure to communicate with a scan tool.

A Straightforward Guide to Installation

Installing your pre-programmed 1998-1999 Suburban 2500 PCM is a job most DIYers can handle with basic tools. Following these steps will ensure a smooth process.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
2. 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 fender well or near the battery.
3. Disconnect the Connectors: Carefully unplug the electrical harness connectors from the old PCM. There are usually release tabs that need to be pressed or lifted. Avoid pulling on the wires themselves.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s usually held in place by a few small bolts or nuts.
5. Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it.
6. Reconnect Everything: Plug the harness connectors firmly into the new PCM until they click into place. Reconnect your negative battery terminal.
7. Security Relearn Procedure: In many cases, you will need to perform a security relearn (often called a CASE relearn or Passlock relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Consult a service manual for your specific vehicle’s procedure.

Will This Fit My Vehicle?

This Electronic Control Module is a direct replacement for service number 16258815 and interchanges with several other part numbers. It is guaranteed to fit the following gasoline-engine models, provided the service ID on your original module is 9355699:

• 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickup
• 1998-1999 Chevrolet Suburban 1500 & 2500
• 1998-1999 Chevrolet Tahoe & GMC Yukon
• 1999 Cadillac Escalade
• 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Van
• 1998 Chevrolet Astro & GMC Safari Van
• 1998 Oldsmobile Bravada
• 1998 Chevrolet S10 & GMC Sonoma
• 1998 Chevrolet Blazer & GMC Jimmy
• 1998 Isuzu Hombre (4.3L V6)