Restore Peak Performance to Your 1999 Cadillac Escalade
If your 1999 Cadillac Escalade is suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, it can cause a wide range of problems that can be difficult to diagnose. This replacement engine computer is the definitive solution to get your truck running reliably again.
This is a genuine, used OEM General Motors PCM, part number 16258815, that has been meticulously tested and is ready for service. The critical advantage of our service is that we program, or ‘flash’, the module specifically for your vehicle before it ships. By providing us with your Vehicle Identification Number (VIN) during checkout, we load the latest, most stable GM-approved software directly onto the unit. This ensures that the computer is perfectly matched to your Escalade’s specific engine, transmission, and factory options, eliminating the need for an expensive trip to the dealership for programming.
Common Symptoms of a Failing Engine Computer
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring unexpectedly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start (no-start condition).
- ✔ Failure to pass state emissions inspections.
- ✔ Intermittent issues that are difficult to replicate.
From the Diagnostic Bay
I remember a ’98 GMC Yukon, which shares the same platform as the Escalade, that came into the shop with a maddening intermittent no-start condition. The owner had already replaced the battery, alternator, and crank sensor. We could find no issues with fuel pressure or spark when it was running. After hours of diagnostics, we noticed the PCM would lose communication with our scan tool when the engine bay got hot. The internal circuits were failing under heat. We installed a VIN-programmed PCM just like this one, and the truck fired up instantly, every time. It’s a classic failure mode for these older modules, and a pre-programmed unit is the fastest, most reliable fix.
The Right Solution for Your 1999 Escalade PCM
Don’t let a faulty computer keep your luxury SUV off the road. This replacement 1999 Escalade PCM is a cost-effective and reliable alternative to a new dealership part. Because it’s a genuine GM component, you can be assured of proper fitment and function. The unit is sourced from a salvaged vehicle and thoroughly inspected to ensure its integrity. The key is our professional programming service, which makes installation as straightforward as possible.
Installation and Setup
Installation is typically a simple process. The PCM is located in the engine compartment. You’ll need to disconnect the vehicle’s battery, carefully unplug the electrical connectors from the old module, unbolt it from its bracket, and install the new one in its place. Once the new module is connected and the battery is reconnected, you are nearly ready to go. In most cases, you will need to perform a security relearn procedure, sometimes called a CASE (Crankshaft Angle Sensor Error) relearn. This procedure syncs the new computer with your vehicle’s anti-theft system and crankshaft position sensor. Instructions for this are widely available online and can often be done without special tools.
Guaranteed Compatibility
This module, identified by primary part number 16258815, also serves as a direct replacement for several other service numbers, including 09355699, 16266645, and 9366810. It fits a wide array of 1998 and 1999 General Motors trucks and vans, such as the Chevrolet Tahoe, Suburban, C/K Pickups, Express vans, and their GMC counterparts. Please verify your part number against our cross-reference list to ensure a perfect match for your vehicle.
Frequently Asked Questions
Do I need to send my old computer in (core charge)?
No, there is no core charge for this part. You can keep or dispose of your old module at your convenience.
Is this part truly plug-and-play?
Because we program it to your VIN, it is as close to plug-and-play as possible. However, you will likely need to perform a simple security/CASE relearn procedure after installation for the vehicle to start and run correctly.
How do I provide my vehicle’s VIN?
You can add your 17-digit VIN in the notes section during checkout or simply reply to your order confirmation email with the information. We cannot ship the part until we receive your VIN.
What if my original part number is different?
This module is a direct replacement for multiple part numbers, including the very common 09355699. Please check the list of compatible part numbers in the description to confirm it will work for your vehicle.
Is this a new part?
No, this is a high-quality, tested, used OEM part sourced from a salvaged vehicle. This allows us to offer a reliable, programmed solution at an excellent price.