Restore Peak Performance to Your GM Truck or SUV
Is your 1999 Cadillac Escalade, Chevy Tahoe, or GMC Yukon running rough, stalling unexpectedly, or showing a persistent check engine light? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and complex issues. As the central computer for your engine and transmission, its health is critical for performance, fuel economy, and reliability. This isn’t just a replacement part; it’s a direct solution to restore your vehicle’s factory operation, delivered ready to install right out of the box.
Over my 20 years in automotive diagnostics, I’ve seen countless vehicles sidelined by faulty engine computers. The symptoms can be misleading, from random misfires to harsh shifting, often leading owners down a rabbit hole of expensive and unnecessary repairs. This module solves the problem at its source. We take the guesswork and hassle out of the equation by pre-programming this PCM with the latest official GM software updates, specifically matched to your vehicle’s VIN. This means no expensive trips to the dealer for programming—a savings of time and money that gets you back on the road faster.
From the Diagnostic Bay: The Case of the Ghost Misfire
A customer brought in his ’99 GMC Yukon with a problem that had stumped two other shops: an intermittent misfire and a no-start condition that only happened when the engine was hot. The scan tool showed a P0300 (Random/Multiple Misfire) code, but the plugs, wires, cap, and rotor were all new. After checking fuel pressure and spark, everything seemed fine. On a hunch, I monitored the 5-volt reference signal from the PCM to the sensors while warming up the engine. Sure enough, as the engine bay heat-soaked, the voltage started fluctuating wildly before dropping out completely, causing the engine to stall. The internal voltage regulator on the original PCM was failing under heat. Installing a correctly programmed PCM like this one solved the problem instantly. It’s a classic failure on these GMT400 platforms that a simple component swap can’t fix.
Is Your GM Truck or Van Showing These Signs?
- ✔ Persistent Check Engine Light (CEL)
- ✔ Critical diagnostic trouble codes (DTCs) like P0601, P0605, or P0606 indicating internal module failure.
- ✔ Unexplained drop in fuel economy (MPG).
- ✔ Engine stalling, stumbling, or running rough.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle in under 30 minutes with basic hand tools. Our pre-programming service makes it a true plug-and-play fix.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most compatible trucks and SUVs (like the Escalade, Tahoe, Yukon, and pickups), the PCM is a silver box with multiple large electrical connectors located in the engine compartment, typically on the driver’s side inner fender. On Astro/Safari vans, it’s usually near the battery.
- Disconnect Connectors: Carefully unclip and remove all electrical harness connectors from the old module. They are often color-coded to prevent mix-ups.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into the mounting bracket.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module. Reconnect the negative battery terminal.
- Final Step: Start the vehicle and let it idle for a few minutes. The check engine light should be off, and your vehicle is ready to drive.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16250279, 09366810, and 09355699. It is guaranteed to fit the following vehicles (please verify your specific options):
- Cadillac Escalade: 1999
- Chevrolet/GMC C/K 1500, 2500, 3500 Pickups: 1998-1999 (Gasoline engines including 5.0L, 5.7L)
- Chevrolet/GMC Suburban 1500, 2500: 1998-1999 (Gasoline engines)
- Chevrolet Tahoe / GMC Yukon: 1998-1999 (Gasoline engines)
- Chevrolet Astro / GMC Safari Van: 1998-1999 (4.3L)
- Chevrolet Express / GMC Savana 1500, 2500, 3500 Vans: 1998 (Gasoline engines)
- Chevrolet S10 / GMC Sonoma: 1998 (4.3L)
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada: 1998
- GMC Envoy: 1998
- Isuzu Hombre: 1998 (4.3L)
Important: After purchase, you must provide your Vehicle Identification Number (VIN) so we can program the module for your exact vehicle configuration before shipping.
Do I need to get this 1999 Escalade PCM programmed by a dealer?
Do I need to get this 1999 Escalade PCM programmed by a dealer?
No. The main benefit of our service is that we program the module for you before it ships. Simply provide your VIN at checkout, and it will arrive ready to install, saving you hundreds in dealership programming fees.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your vehicle. We use it to load the precise factory software for your engine, transmission, and options, ensuring perfect compatibility and performance.
Where is the PCM located on my 1999 GMC Yukon or Chevy Tahoe?
On most 1998-1999 GM full-size trucks and SUVs, the PCM is located in the engine bay on the driver’s side, mounted to the inner fender wall. It’s a silver metal box with several large wiring harnesses connected to it.
Will this part fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (common codes include P0601, P0605, P0606), then this replacement module will resolve the issue. However, you should always diagnose the codes to ensure the problem isn’t a faulty sensor or other component.
Is this compatible with other part numbers?
Yes, this module directly replaces service numbers 16250279, 09366810, and 09355699. If your original module has one of these numbers, this is the correct part for you.