Restore Your Truck’s Brain and Get Back on the Road
Is your 1999 Cadillac Escalade or GM truck acting up? Dealing with a persistent check engine light, erratic engine behavior, or a frustrating no-start condition can bring any project to a halt. As a technician with over two decades of experience, I’ve seen countless vehicles sidelined by a failing Powertrain Control Module (PCM). This isn’t just a part; it’s the central computer responsible for engine performance, transmission shifting, and fuel economy. When it fails, your vehicle’s reliability is compromised.
This is a dependable, used OEM PCM that has been meticulously tested and is ready for service. The most significant benefit we offer is our professional programming service. Before this module ships, we will flash it with the latest official GM software updates, specifically matched to your vehicle using your VIN. This critical step ensures the PCM communicates perfectly with your truck’s systems, saving you a costly trip to the dealership and the hassle of finding a shop with the right equipment. This is the direct, effective solution for restoring your vehicle’s factory performance.
A Technician’s Notebook: The Ghost in the Machine
I remember a ’99 Suburban that came into my bay with the weirdest problem. The owner said it would randomly stall at red lights, but only on hot days. There were no consistent trouble codes, just a history of random sensor faults. We checked wiring, sensors, and fuel pressure—all were fine. After two days of chasing this electrical ghost, I decided to monitor the PCM’s internal temperature data while letting the truck idle. Sure enough, as the under-hood temps climbed, the PCM’s data stream would start to corrupt right before it stalled. A failing processor was overheating. We swapped in a pre-programmed PCM just like this one, and the problem was solved instantly. These intermittent issues are often the first sign of a dying 1999 Escalade PCM, and a direct replacement is the only true fix.
Is Your GM Vehicle Showing These Symptoms?
- âś” Check Engine Light is on with codes like P0601, P0602, or P0605 (Internal Module Errors).
- âś” The engine cranks but refuses to start.
- âś” Unexplained stalling or rough idling, especially when warm.
- âś” Noticeable decrease in fuel economy.
- âś” Harsh or incorrect automatic transmission shifting.
- âś” Communication errors with your scan tool.
Your Straightforward Installation Guide
- âś” Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- âś” 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 fender or near the battery.
- âś” Disconnect Connectors: Carefully unplug the wiring harness connectors from the old PCM. There are usually release tabs that need to be pressed or lifted.
- âś” Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held by a few small bolts.
- âś” Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely plug in the wiring harness connectors. Ensure they click into place.
- âś” Reconnect Battery: Re-attach the negative battery terminal.
- âś” Perform Security Relearn (If Necessary): Your vehicle may require a simple security relearn procedure to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your owner’s manual for the exact procedure for your vehicle.
Verified Vehicle Compatibility
This module, identified by part number 16258815 or service ID 09355699, is a direct replacement for a wide range of GM and Isuzu vehicles. Please verify your original part number or consult the list below to ensure a perfect match for your truck or van.
Note: For models marked ’98, check compatibility for vehicles without build date option ZN4.
Do I need to get this 1999 Escalade PCM programmed?
Do I need to get this 1999 Escalade PCM programmed?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct, updated software for your specific vehicle.
Is this a new part?
Do I need to get this 1999 Escalade PCM programmed?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct, updated software for your specific vehicle.
What is the security relearn procedure?
Do I need to get this 1999 Escalade PCM programmed?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct, updated software for your specific vehicle.
How do I find my part number?
Do I need to get this 1999 Escalade PCM programmed?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct, updated software for your specific vehicle.
Will this fix my transmission shifting problems?
Do I need to get this 1999 Escalade PCM programmed?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct, updated software for your specific vehicle.