We’re Hiring! Seeking Junior Engineers, Electronic Technicians, and Automotive Programmers for immediate hire due to company expansion. Interested? Visit our Careers Page or Call 818-798-5558.
Due to an influx of orders, ECM repairs are delayed. We apologize for the inconvenience and working diligently to get orders out in a timely manner - Mak’s Team

Search by Vehicle


Search by VIN

Search by part

Important: You MUST know your correct part number BEFORE placing your order!


REBUILT ECM for 1998 – 1999 GMC Suburban 1500 / 2500 5.7L 16266635, 09355699

Mak’s ECM Rebuilders is a premium supplier of new and rebuilt GMC PCM. We provide only the best new and rebuilt Powertrain Control Modules for your 1998 – 1999 GMC Suburban 1500 / 2500, that are available on the internet. Our PCM technicians have years of experience building, repairing, and rebuilding automotive computers. Combine this with our state-of-the-art PCM testing and rebuilding equipment and you have a final product that is second to none.

This REBUILT OEM PCM fits the following vehicles:

  • 1998 – 1999 GMC Suburban 1500 / 2500 – 5.7L

Supported Trims: Base, LS, LT, Z71


SKU 09355699-79-REBUILT Categories , , , Tags , , , , , , ,



Final total


Providing a more detailed information about the issues you're having expedites our repair process, ensuring swift resolution for your needs.

Validating Order Number, Please wait.
Searching Part Number, Please wait.
  • Enter Your 17-digit VIN

    VIN is required for programming, if you do not provide your VIN, the part cannot be programmed and may not be suitable for your vehicle.

Convert your purchase to a rental within 30 days if the part is not the real problem. Check our Warranty Information & Returns Policy for details.

REBUILT 16266635 / P16266635 OEM ECM PCM ECU for 1998 – 1999 GMC Suburban 1500 / 2500 with 5.7L Engine. The Engine Computer, also known as the Engine Control Module (ECM), Engine Control Unit (ECU), and Powertrain Control Module (PCM), all refer to the same component with the same functionality.

  • Rebuilt OEM Powertrain Control Module (PCM)Warranty Badge
  • 1-Year Replace or Repair Warranty
  • Optionally extend your warranty at checkout to up to 3 years
  • Free Shipping via Fedex Ground (4-5 Days) or USPS Priority Mail (2-3 Days)
  • Unlimited Free Telephone Support

Interchangeable Part Numbers:

This PCM is 100% compatible with and supersedes PCMs bearing any of the following Part Numbers:

Firmware Revisions: 16266635, 9366810, 9355699, 09355699

Hardware Codes: 9355699

Hollander Part Number: 590-06234A, 590-06234C

The Hardware Code is a number assigned to an PCM during initial manufacturing. It is the “platform” onto which firmware specific to your vehicle / powertrain is then loaded. Always seek to purchase the latest Firmware Revision of your original PCM. 

Part Number Notes: 

  1. The last two alpha characters in PCM Part Numbers refer to the firmware revision. We will ship you the latest revision which is backward-compatible with all prior revisions.
  2. The presence or absence of a leading zero as the first character in the part number is not significant. It may appear on your old PCM with or without a leading zero.
  3. Your old PCM may show a “P”, or “P/N” in front of the part number. This is merely a field heading on the sticker that means “Part Number” and is not significant.

MAK’s stands behind everything we sell and you are always just a free phone call away from a live expert who knows PCMs!

+1 (818) 798-5558