Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Chevrolet or GMC truck, van, or SUV running rough, stalling, or showing a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can wreak havoc on your engine’s performance, fuel economy, and transmission shifting. This genuine, used OEM GM PCM 9355699 is the reliable and cost-effective solution to get your vehicle back on the road and running like it should.
From the Diagnostic Bay
We had a ’99 Chevy Suburban come in with a complaint of erratic shifting and a check engine light that previous shops couldn’t solve. They had already replaced the transmission speed sensor and the throttle position sensor. After hooking up our scanner, we noticed intermittent communication loss with the PCM. Instead of throwing more parts at it, we inspected the PCM connectors for corrosion (they were clean) and confirmed power and ground were good. The final diagnosis was an internal failure in the original module. We installed one of these VIN-programmed units, performed the security relearn procedure, and the truck was shifting perfectly with no codes. It’s a reminder that what seems like a major transmission issue can often be traced back to the computer that controls it.
Diagnosing Your GM PCM 9355699 Failure
The PCM is responsible for managing critical systems, including fuel injection, ignition timing, and automatic transmission shift points. When it begins to fail, the symptoms can be varied and sometimes misleading. If you’re experiencing several of the issues below, there’s a strong possibility your PCM is the culprit. A professional diagnosis is always recommended, but these common indicators can help you and your mechanic pinpoint the problem.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes (DTCs), especially those related to internal module failure or communication errors.
- ✔ Engine stalling, misfiring, or running rough for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting, or getting stuck in one gear.
- ✔ A noticeable decrease in fuel economy.
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Inconsistent performance that gets worse as the engine warms up.
A Simple, Plug-and-Play Solution
Don’t let a faulty computer keep your reliable GM truck off the road. This isn’t just a used part pulled from a shelf; it’s a complete service. We take a tested, functional OEM module and flash it with the latest official GM software updates specifically for your vehicle. All you need to do is provide us with your vehicle’s 17-digit VIN at checkout. This ensures that the module you receive is perfectly matched to your engine, transmission, and factory options, making installation straightforward. This unit is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810.
By choosing this pre-programmed GM PCM 9355699, you avoid expensive dealership programming fees and the uncertainty of installing a blank module. Get your vehicle’s brain back in optimal condition and restore the power and reliability you depend on.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it to you. This makes the unit ready for installation right out of the box, saving you a trip to the dealership and additional programming costs.
What is the security relearn procedure?
For most of these GM vehicles, you will need to perform a simple security relearn procedure after installation so the vehicle recognizes the new PCM. This can typically be done without special tools and involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times. Instructions are readily available online for your specific model.
Where do I provide my VIN?
Please provide your 17-digit Vehicle Identification Number (VIN) in the notes section during checkout or send it to us in a message immediately after placing your order. We cannot program and ship your module without it.
Is this a new part?
This is a high-quality, used OEM (Original Equipment Manufacturer) part that has been sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it is fully functional before being programmed and shipped.
How do I know if this part number will fit my vehicle?
This PCM, part number 9355699, fits a wide range of 1998-1999 GM trucks, vans, and SUVs as listed in the fitment details. The best way to ensure compatibility is to match the part number from your original module. This unit also directly replaces several other part numbers, including 16266645, 16250279, and more.