Is Your GM Truck or Van Running Rough?
If your 1998-1999 Suburban, Tahoe, Yukon, or other GM vehicle is experiencing perplexing issues like a persistent check engine light, erratic engine performance, or transmission problems, a failing Powertrain Control Module (PCM) could be the culprit. The PCM is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, it can cause a cascade of problems that are often difficult to diagnose, leaving you stranded and facing costly repair bills.
From the Diagnostic Bay
I remember a ’99 Tahoe that came into the shop with a complaint of harsh, unpredictable shifting and stalling at idle. The owner had already replaced the transmission speed sensor and the idle air control valve with no luck. After connecting the scan tool, we saw erratic data from multiple sensors and communication fault codes. Instead of chasing phantom sensor issues, we focused on the central hub: the PCM. A quick voltage check at the PCM connectors confirmed our suspicion of an internal failure. We installed a VIN-programmed module just like this one, performed the security relearn, and the Tahoe ran like it just rolled off the assembly line. It’s a classic case of the brain, not the limbs, being the source of the problem.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Poor fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to start or intermittent starting issues
- ✔ Inability to pass an emissions test
- ✔ Communication errors with diagnostic scan tools
The Direct-Fit Solution: A Programmed 1998-1999 Suburban PCM
Don’t let a faulty computer keep your reliable GM truck off the road. This genuine, used OEM Powertrain Control Module, service number 9355699, is the ideal solution. We take the guesswork and hassle out of the repair process. Before we ship the unit, our technicians will program it with the latest GM software updates specifically for your vehicle using the VIN you provide. This ensures that the module communicates perfectly with your truck’s engine, transmission, and all other systems, restoring its original performance and reliability.
This is not a generic, one-size-fits-all part. It’s a specific component meticulously prepared for your vehicle. Upon installation, you will need to perform a simple security relearn procedure (often called a VATS or Passlock relearn), which can typically be done in your driveway without any special tools. This procedure syncs the new PCM with your vehicle’s anti-theft system.
Guaranteed Compatibility
This module is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810. It fits a wide range of 1998-1999 GM trucks and vans, including the Chevrolet Suburban 1500/2500, Tahoe, C/K Pickups, Express Van, GMC Yukon, Sierra, Savana Van, Cadillac Escalade, and more. Please verify the part number from your original module to ensure a perfect match.
Frequently Asked Questions
Do I need to program this PCM?
No. We handle the programming for you before shipment. Simply provide us with your vehicle’s VIN at checkout, and we will flash the module with the correct GM factory software for your specific vehicle configuration.
What is the security relearn procedure?
The security relearn, or VATS/Passlock relearn, is a simple procedure that syncs the new PCM to your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Detailed instructions are readily available online for your specific model.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM (Original Equipment Manufacturer) part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new dealer part.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your order until we receive and validate your VIN.
Will this fix my transmission shifting problems?
If the PCM is the root cause of your shifting issues, then yes, this part will resolve them. The PCM controls the transmission’s electronic solenoids, and a faulty module can cause harsh shifts, delayed engagement, or incorrect gear selection. However, transmission problems can also be caused by mechanical issues or faulty solenoids, so a proper diagnosis is always recommended.