Restore Peak Performance to Your GM Truck or Van
If you’re dealing with frustrating engine problems in your 1999 Cadillac Escalade or another compatible GM vehicle, you know how disruptive it can be. Issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition can often point directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, when the PCM falters, everything it controls can go haywire. This isn’t just an inconvenience; it affects your vehicle’s reliability and safety.
This is a dependable, tested, used OEM PCM with service number 9355699. The real value here is our professional programming service. Before this module ships, our technicians will flash it with the latest official GM software updates, precisely matched to your vehicle using your VIN. This means it arrives at your door ready for installation, saving you a costly trip to the dealership for programming. You get a reliable part that solves your problem without the hassle.
Case Study: A Tricky Diagnosis
I remember a 1998 Chevy K1500 that came into my shop. The owner had spent a fortune replacing the throttle position sensor, the mass airflow sensor, and even the fuel pump chasing a stalling issue. The codes were all over the place. After checking the basics, I hooked up my professional scan tool and tried to communicate with the PCM. The connection kept dropping—a classic sign. It turned out the PCM’s internal processor was failing, sending faulty signals and causing the other components to seem defective. We installed a VIN-programmed PCM like this one, and the truck ran perfectly. It’s a powerful reminder that sometimes the problem is the brain, not the limbs.
Is Your Vehicle Showing These Signs of PCM Failure?
- ✔ Persistent Check Engine Light that won’t clear
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0602, or P0606
- ✔ Vehicle won’t start or is very difficult to start
- ✔ Poor or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel efficiency
- ✔ Engine stalling, sputtering, or misfiring for no apparent reason
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Installing your programmed PCM is a job most DIYers can handle with basic tools. Getting your vehicle back on the road is simpler than you think.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting work.
- 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 well or near the battery.
- Disconnect the Module: Carefully unplug the electrical wiring harnesses. These connectors have locking tabs that need to be released before you can pull them out. Avoid forcing them.
- Remove the Old PCM: Unbolt the module from its mounting bracket. Keep the hardware, as you may need it to install the new unit.
- Install the Programmed PCM: Mount the new module securely and reconnect the wiring harnesses. Ensure they click into place to confirm a solid connection.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn: Many GM vehicles of this era require a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating a few times. Consult a service manual for your specific vehicle’s procedure.
Verified Vehicle Compatibility
This module is a direct replacement for service number 9355699 and is compatible with a wide range of GM vehicles. Please verify your original part number matches. This part is confirmed to fit the following vehicles with the specified options:
Fits Models Including:
- Cadillac Escalade: 1999
- Chevrolet/GMC Pickups (1500, 2500, 3500): 1998-1999 (Gasoline)
- Chevrolet/GMC Suburban (1500, 2500): 1998-1999 (Gasoline)
- Chevrolet Tahoe / GMC Yukon: 1998-1999 (Gasoline)
- Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 1998-1999 (Gasoline)
- Chevrolet Astro / GMC Safari: 1998
- Chevrolet S10 / GMC Sonoma: 1998 (4.3L)
- Chevrolet Blazer / GMC Jimmy: 1998 (4.3L)
- Oldsmobile Bravada: 1998
- GMC Envoy: 1998
- Isuzu Hombre: 1998 (4.3L)
Note: Please match the ID number 9355699 from your original module to ensure compatibility.
Frequently Asked Questions
Do I need to get this computer programmed?
Do I need to get this computer programmed?
No. We handle all the programming for you before we ship the part. Just provide your vehicle’s 17-digit VIN during or after checkout, and it will arrive ready to install.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is your car’s unique serial number. It allows us to access the exact GM factory calibration file for your specific engine, transmission, and options, ensuring the PCM works perfectly.
Is this a new part?
This is a high-quality, tested, used OEM part sourced from a salvaged vehicle. This provides the reliability of a genuine factory part at a significant cost savings compared to a new unit from a dealer.
What is the security relearn procedure?
It’s a simple process to sync the new PCM with your vehicle’s anti-theft system so the engine will start. It typically involves a sequence of key turns and waiting periods. While simple, the exact steps can vary, so we recommend looking up the procedure for your specific model year.
How do I find my PCM’s part number?
The part number (or Service No.) is printed on a sticker directly on your original PCM. You will need to locate the module in your engine bay to read it. Matching this number is the best way to guarantee compatibility.