Is Your 1999 Escalade or GM Truck Running Rough?
If you’re dealing with a persistent Check Engine Light, erratic engine behavior, or a vehicle that just won’t start, the problem often points directly to a failing Powertrain Control Module (PCM). As the brain of your vehicle, when the PCM goes, it can create a host of frustrating and hard-to-diagnose issues. I’ve spent two decades under the hood of these trucks, and I’ve seen perfectly good engines sidelined by a faulty computer.
From the Shop Floor: A Real-World Diagnosis
“A customer’s ’99 Tahoe, which uses this exact same PCM, came in last week with intermittent stalling and a stubborn P0300 random misfire code. The owner had already replaced plugs, wires, and the coil. After confirming fuel pressure and spark were good, we suspected the PCM. We swapped in one of our pre-programmed units, and the truck ran perfectly. The issue was an internal processor failure causing incorrect injector commandsโa common problem on these older GM computers.”
The Direct Solution: A VIN-Programmed PCM
This isn’t just a used part pulled from a yard. This is a tested, reliable OEM PCM sourced from a salvaged vehicle that we professionally program specifically for your 1999 Cadillac Escalade. We use your vehicle’s VIN to load the latest, most stable software updates from General Motors. This process ensures that your engine and transmission operate exactly as the manufacturer intended, restoring performance and reliability.
Symptoms of a Failing 1999 Escalade PCM:
- โ Persistent Check Engine Light with various codes (especially communication or processor faults)
- โ Engine cranks but refuses to start
- โ Rough idle, stalling, or hesitation during acceleration
- โ Noticeable decrease in fuel economy
- โ Harsh or incorrect automatic transmission shifting
- โ Failure to pass an emissions test
Plug-and-Play Installation: No Dealer Visit Required
One of the biggest headaches with replacing a PCM is the required programming, which usually means a tow to the dealership and a hefty bill. We eliminate that step. This module arrives at your door ready for installation.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On your 1999 Escalade, the PCM is typically found in the engine compartment on the driver’s side.
- Disconnect the Old Unit: Carefully unplug the wiring harness connectors from the old PCM. Inspect the connectors for any corrosion or bent pins and clean them if necessary.
- Install the New PCM: Mount the replacement PCM and securely plug in the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Power: Re-attach the negative battery terminal. The vehicle is now ready to start.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM trucks and vans. Please verify that your original module has one of the following part numbers printed on its label:
09355699, 16266645, 9355699, 16250279, 16258815, 09366810, or 9366810.
This part is confirmed to fit a vast array of vehicles including the Chevy Silverado, Suburban, Tahoe, Express Van, GMC Sierra, Yukon, Savana Van, and many more from the 1998-1999 model years. Please refer to the detailed fitment list to confirm compatibility with your specific vehicle and options.
IMPORTANT: After placing your order, you must provide us with your 17-digit VIN. We cannot ship your part until we have this information to complete the programming process.