Restore Peak Performance to Your GM Truck or Van
Is your trusty Chevrolet Express van or GMC truck suddenly unreliable? Stalling, shifting hard, or a persistent check engine light can bring your work to a halt and cause major frustration. When the brain of your engine—the Engine Control Module (ECM)—starts to fail, it can create a cascade of confusing problems. This isn’t just a component; it’s the command center for your vehicle’s performance and efficiency. Get back on the road with confidence with this fully programmed, ready-to-install replacement 1998-1999 Chevy Express 3500 ECM.
Common Symptoms & Your Solution
A failing ECM can be tricky to diagnose, often mimicking other sensor or component failures. If you’re experiencing any of the following, a faulty module is a likely culprit:
- No-Start or Intermittent Stalling: The engine cranks but won’t start, or it dies unexpectedly while driving.
- Harsh or Erratic Shifting: Your transmission may shift at the wrong times, bang into gear, or seem to hunt for the right gear.
- Check Engine Light with Communication Codes: You may see codes like U0100 (Lost Communication with ECM/PCM) or other codes that won’t clear.
- Poor Fuel Economy and Performance: A noticeable drop in MPG, sluggish acceleration, or rough idling are classic signs.
- Multiple Unrelated Sensor Codes: If you’re seeing codes for various sensors all at once, the computer itself may be the root cause.
This module is the definitive solution. We take a quality, tested unit and flash it with the latest official GM software, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures all systems—from fuel delivery to transmission control—operate exactly as the manufacturer intended.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s exact VIN, ensuring it works seamlessly with your specific options and systems. No dealer visit required for programming.
- ✔ Latest GM Software Updates: Your module arrives with the most current software from General Motors, which can resolve factory bugs and improve performance and efficiency.
- ✔ Direct-Fit Replacement: Guaranteed to fit and function just like the original part for a wide range of GM trucks, vans, and SUVs. This is a direct replacement for part number 09355699 and others listed.
- ✔ Cost-Effective Solution: Get a reliable, programmed computer for a fraction of the cost of a new unit from a dealership.
- ✔ Get Back to Work Faster: This pre-programmed 1998-1999 Chevy Express 3500 ECM minimizes vehicle downtime, getting your workhorse back on the job where it belongs.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
Expert Insight from a 20-Year Vet
As a tech who’s spent decades with my hands on these vehicles, I’ve seen countless headaches caused by improperly matched computers. A generic, un-programmed module from a junkyard is just a paperweight. Our process ensures this ECM is flashed specifically for your vehicle’s VIN, loading the correct fuel maps, transmission strategies, and security information from the start. This isn’t just a part; it’s a vehicle-specific solution that saves you a trip to the dealer and gets you back to work faster.
Don’t let a bad computer keep your vehicle sidelined. This is the straightforward, reliable fix you need to restore your truck or van’s dependability. By providing us with your VIN at checkout, you ensure that the 1998-1999 Chevy Express 3500 ECM you receive is truly plug-and-drive, ready to get your engine running smoothly again.
Frequently Asked Questions
How do I provide my VIN?
After you complete your purchase, you will need to send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your ECM without it.
Is this a new part?
No, this is a high-quality used computer that has been sourced from a salvaged vehicle. Each unit is thoroughly tested to ensure full functionality before being programmed and shipped.
Will I need to do anything after installation?
In most cases, you will need to perform a security relearn procedure, which can typically be done without special tools and takes about 30 minutes. Instructions can be easily found online for your specific model. Some vehicles may also require a Crankshaft Variation Relearn (CASE Relearn), which may require a scan tool.
How do I know if my ECM is the problem?
Common signs include a no-start condition, erratic engine performance, harsh transmission shifting, multiple unrelated trouble codes, or a check engine light that won’t go away. We recommend having a qualified mechanic perform a full diagnostic, but these are strong indicators.
What does “programmed” mean?
Programming, or “flashing,” means we load the computer with the specific software for your vehicle using your VIN. This ensures the ECM knows your engine size, transmission type, and other critical options, allowing it to function correctly right out of the box.
What is the warranty on this part?
This unit is backed by our one-year replacement warranty.