Is Your 1999 Escalade or GM Truck Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, random stalling, poor fuel mileage, or a vehicle that just won’t start, a failing Powertrain Control Module (PCM) is often the culprit. For these classic late-90s GM trucks and SUVs, the PCM is the central command center. When it fails, it can cause a cascade of problems that are difficult to diagnose. This isn’t just a part; it’s the solution to getting the reliable performance you expect from your vehicle.
The Smart, Simple Solution: A VIN-Programmed PCM
Forget expensive trips to the dealership for diagnostics and programming. We offer a reliable, tested, and ready-to-install PCM sourced from a salvaged vehicle. The most critical step is already done for you: we flash the module with the latest official GM software updates using your vehicle’s specific VIN. This ensures perfect communication between the engine, transmission, and all other onboard systems.
- โ VIN-Programmed for You: Arrives ready for installation, flashed specifically for your truck or SUV.
- โ Latest GM Software: We load the most current calibrations to improve performance and efficiency over the original software.
- โ Cost-Effective Repair: Get a dependable OEM part without the high cost of a new module and dealer programming fees.
- โ Solves Common Issues: Directly addresses symptoms like no-start conditions, erratic idle, harsh shifting, and false sensor codes.
- โ Broad Compatibility: Replaces multiple part numbers, including the common ID 09355699, fitting a wide range of 1998-1999 GM vehicles.
Why a Programmed 1999 Escalade PCM is Crucial
In my 20+ years in the shop, I’ve seen countless owners replace part after part chasing a ghost, only to find the PCM was the root cause. A customer’s ’99 Yukon (which uses this exact same computer) came in last week with a baffling no-start condition. We checked fuel, spark, and all the groundsโeverything looked perfect. A deep dive with the scan tool showed the 5-volt reference circuit, which powers most of the engine sensors, was dead. The fault was internal to the original PCM. A replacement like this one, programmed to his VIN, had him back on the road in under an hour, problem solved.
Expert Pro Tip: Don’t Forget the Security Relearn!
After installation, your vehicle might not start due to the Passlock security system. This is normal. You’ll need to perform a security relearn procedure. It’s simple: turn the key to the ‘ON’ position (without starting) for 10-15 minutes until the security light goes out. Turn the key ‘OFF’ for 10 seconds. Repeat this cycle three times. This syncs the new PCM to your vehicle and saves you a tow to the shop.
Easy Installation: Get Back on the Road Fast
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and SUVs, including the Escalade, the PCM is located in the engine compartment on the driver’s side (LH side).
- Disconnect Harnesses: Carefully unclip and remove the electrical wiring harnesses. Inspect the pins for any corrosion and clean them if necessary.
- Remove Old Unit: Unbolt the old PCM from its mounting bracket and remove it.
- Install Replacement: Mount the new PCM, reconnect the wiring harnesses securely, and reconnect the battery terminal.
- Perform Relearn: Follow the security relearn procedure detailed in our pro tip above. Start the engine and verify the check engine light is off.
To ensure a perfect match, simply provide us with your vehicle’s 17-digit VIN during or after checkout. We’ll handle the programming, so you can handle the repair with confidence.