Get Your GM Truck or Van Running Reliably Again
Is your truck or van plagued by erratic engine behavior, poor shifting, or a persistent check engine light that won’t go away? A failing Powertrain Control Module (PCM) can bring your dependable workhorse to a standstill, causing endless frustration and costly diagnostic guesswork. This professionally tested and prepared engine computer is the definitive solution to restore your vehicle’s performance and get you back on the road with confidence. We flash this unit with the latest GM software updates, programmed specifically to your vehicle’s VIN, ensuring it’s ready for a straightforward installation right out of the box.
Common Symptoms & Your Solution
If you’re experiencing any of the issues below, a faulty PCM is the likely culprit. This unit is designed to resolve these exact problems:
- Inexplicable Check Engine Light (CEL) illumination
- Engine stalling, stumbling, or rough idling
- Harsh or erratic automatic transmission shifting
- Complete no-start condition where the engine cranks but won’t fire
- Poor fuel economy and loss of power
- Communication error codes (U-codes) with scan tools
- False sensor codes that return even after replacing the sensor
Instead of continuing to chase symptoms, address the root cause. This programmed 16258815 PCM is the central command unit for your engine and transmission, and replacing a faulty one is the most effective way to restore proper function.
Features & Tangible Benefits
- ✔ VIN-Specific Programming: We flash the computer to your exact VIN before it ships. This means no expensive trip to the dealership for programming—saving you time and money.
- ✔ Plug & Play Ready: Once you receive the module, installation is straightforward. In most cases, you’ll only need to perform a simple security relearn procedure, which can be done without special tools.
- ✔ Latest GM Software Updates: Your module arrives with the newest factory software, which can correct original drivability issues, improve transmission shifting, and optimize fuel efficiency.
- ✔ Cost-Effective & Reliable: This is a high-quality, tested computer sourced from a salvaged vehicle, providing a dependable solution at a fraction of the cost of a new unit.
- ✔ Guaranteed Peace of Mind: This unit is backed by our one-year replacement warranty. Drive with confidence knowing your purchase is protected.
An Expert’s Diagnostic Tip
I once had a customer with a ’99 Suburban who had replaced his crank sensor, cam sensor, and even the fuel pump trying to solve an intermittent stalling issue. His scanner wasn’t showing any PCM-specific codes, just a random assortment of sensor faults. The real problem was the PCM itself; its internal circuits were failing under heat, causing it to send faulty signals. After installing a properly programmed 16258815 PCM, all the ghost codes vanished and the truck ran perfectly. Don’t let a bad computer send you on an expensive parts chase—start at the source.
Frequently Asked Questions
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot ship your part until we receive the VIN.
Is this a new part?
No, this is a used, original equipment (OE) computer that has been carefully sourced from a salvaged vehicle. Each unit is tested to ensure it is fully functional before being programmed and shipped.
Will I need to do anything after installing this PCM?
Yes. After installation, you will need to perform a security relearn procedure (also known as a CASE relearn or Passlock relearn). This syncs the new computer to your vehicle’s anti-theft system. This procedure can typically be done yourself in about 30 minutes without any special tools. Instructions can be readily found online for your specific model.
Does this part have a warranty?
Yes, absolutely. This unit is backed by our one-year replacement warranty. Should you have any issues with the computer within that period, we will provide a replacement.
How can I be sure this fits my vehicle?
This programmed 16258815 PCM fits a wide range of 1998-1999 GM trucks, vans, and SUVs. The best way to confirm is to match the part number from your original computer to one of the compatible numbers listed in our description (09355699, 16266645, etc.). Providing us with your VIN ensures we program it correctly for your exact vehicle options.