1998 GMC Envoy Powertrain Control Module (PCM) 09355699 – Programmed to Your VIN

Dealing with engine hesitation or erratic shifting in your 1998 GMC Envoy? As a seasoned automotive repair advisor with over two decades in diagnostics and parts, I’ve seen how a faulty powertrain control module can turn a reliable SUV into a headache. This pre-programmed PCM, part number 09355699, arrives ready for your vehicle after we flash it with the latest GM updates using your VIN. Simply provide your VIN post-purchase, and we’ll handle the rest for seamless compatibility.

Key Features & Benefits

This PCM isn’t just a replacement—it’s optimized for peak performance in your 1998 GMC Envoy. It manages critical functions like fuel injection, ignition timing, and emissions control, ensuring smooth operation whether you’re navigating city streets or off-road trails.

• VIN-Specific Programming: We use your vehicle’s identification number to match software precisely, eliminating guesswork and reducing installation time.
• Latest GM Updates: Incorporates recent fixes for common glitches, enhancing reliability and fuel efficiency.
• Compatible Part Numbers: Works with 16250279, 09366810, and 09355699 for broad application.
• Direct Fit: Designed for easy swap in the right-hand front engine compartment, without needing special tools beyond basics.

In my experience, owners of similar GM vehicles report better throttle response and fewer check engine lights after installing a unit like this. It’s especially helpful for those towing trailers, where consistent power delivery matters most.

Common Issues & How This Fixes Them

Picture this: You’re cruising in your 1998 Envoy, and suddenly the engine stalls at idle or shifts roughly during acceleration. These symptoms often stem from a failing PCM, corrupted by age, heat, or electrical surges. I’ve diagnosed countless cases where codes like misfire or sensor faults point straight to the module.

This programmed PCM resolves those by restoring accurate control signals. For instance, if you’re facing poor fuel economy or starting problems—common in late ’90s GM models—this unit recalibrates systems for optimal operation. Expert tip: Before replacing, scan for diagnostic trouble codes using an OBD-II tool. If you see issues related to communication or voltage, this is your fix.

Another scenario: During rainy drives, water intrusion might short the original module, causing intermittent failures. Our VIN-matched PCM comes updated to handle such vulnerabilities, preventing repeats. Remember, always check wiring harnesses for corrosion—I’ve fixed many “module” problems that were actually bad connections.

• Symptom: Engine won’t start or runs rough. Cause: Faulty PCM calibration. Fix: Install this pre-flashed unit for instant correction.
• Symptom: Transmission slips. Cause: Module signal errors. Fix: Updated software ensures precise shifting.
• Pro Tip: After installation, clear codes and perform a drive cycle to let the system adapt—usually 50-100 miles of mixed driving.

Easy Installation Guide

Swapping the PCM in your 1998 GMC Envoy is straightforward for DIYers. Locate it in the right-hand front engine compartment (without build date option ZN4). Disconnect the battery, unplug connectors, remove mounting bolts, and reverse for the new one. Total time: 30-45 minutes.

Tools needed: Socket set, screwdriver, and anti-static wrist strap to protect electronics. If you’re not comfortable, a local shop can handle it affordably. Post-install, your Envoy should run like new—I’ve seen it restore performance in vehicles just like yours.

Fitment Details

This Electronic Control Module fits a range of 1998-1999 GM vehicles with gasoline engines, specifically those without build date option ZN4 where noted. Verify your ID matches 16250279, 16258815, or compatible numbers.

Compatible with:

• 1998 GMC Envoy (RH front engine compartment, w/o ZN4; ID 16250279 or 16258815)
• 1999 Cadillac Escalade (LH front engine compartment, ID 16250279)
• 1998-1999 GMC Yukon (LH engine compartment, ID 16250279)
• 1998-1999 GMC Safari (LH front by battery, ID 16250279)
• 1998 Oldsmobile Bravada (6-262 4.3L, w/o ZN4; ID 16250279 or 16258815)
• 1998 Chevrolet Express 1500 Van (ID 16250279)
• 1998 Chevrolet Express 2500 Van (gasoline, ID 16250279)
• 1998 Chevrolet Express 3500 Van (gasoline, ID 16250279)
• 1998-1999 Chevrolet Tahoe (gasoline, LH front engine compartment, ID 16250279)
• 1998-1999 Chevrolet Suburban 1500 (gasoline, LH front engine compartment, ID 16250279)
• 1998-1999 Chevrolet Suburban 2500 (gasoline, LH front engine compartment, ID 16250279)
• 1998-1999 Chevrolet 1500 (gasoline or 5.0L/5.7L, LH engine compartment, ID 16250279)
• 1998-1999 Chevrolet 2500 (gasoline, LH front engine compartment, ID 16250279)
• 1998-1999 Chevrolet 3500 (gasoline, LH front engine compartment, ID 16250279)
• 1998-1999 GMC 1500 (gasoline or 5.0L/5.7L, LH engine compartment, ID 16250279)
• 1998-1999 GMC 2500 (gasoline, LH front engine compartment, ID 16250279)
• 1998-1999 GMC 3500 (gasoline, LH front engine compartment, ID 16250279)
• 1998-1999 Chevrolet Astro (LH front by battery, 4.3L, ID 16250279)
• 1998 Chevrolet Blazer S10/Jimmy S15 (RH front engine compartment, w/o ZN4; ID 16250279 or 16258815)
• 1998 GMC S10/S15/Sonoma (6-262 4.3L, w/o ZN4; ID 16250279 or 16258815)
• 1998 Isuzu Hombre (4.3L 6 cylinder, w/o extended ZN4; ID 16250279 or 16258815)
• 1998 GMC Savana 1500 Van (ID 16250279)
• 1998 GMC Savana 2500 Van (gasoline, ID 16250279)
• 1998 GMC Savana 3500 Van (gasoline, ID 16250279)

For your 1998 GMC Envoy, confirm details and provide your VIN for exact programming. Don’t let PCM problems sideline your ride—order now and get back on the road with confidence!