Is Your 1998 Envoy Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, poor fuel mileage, stalling, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shifting. When it starts to fail, the symptoms can be unpredictable and hard to diagnose. I’ve seen hundreds of these GM trucks and SUVs in my shop over the years, and a faulty PCM can make an otherwise solid vehicle completely unreliable.
A Real-World Scenario from the Shop
“A customer’s ’98 GMC Jimmy S15 came in last week with a no-start condition after sputtering for days. Another shop quoted him over a thousand dollars for a new PCM and programming. Before swapping the part, I did a quick check of the basics. On these 4.3L Vortec engines, the ignition control module, located under the distributor cap, is a frequent failure point and can perfectly mimic a bad PCM. Sure enough, that was his issue. It’s a reminder to always check your basics—plugs, wires, cap, rotor, and the ignition module—before condemning the computer. However, if those are good, the PCM is the next logical step.”
The Simple, Cost-Effective Solution
Forget expensive dealership visits and programming fees. This is a quality, tested, used OEM Powertrain Control Module that offers a reliable and affordable fix. We take the guesswork out of the repair by programming the unit specifically for your vehicle using your VIN. This ensures all the factory settings for your engine, transmission, and options are perfectly matched.
Key Features & Benefits:
- ✔ VIN-Programmed for Your Vehicle: We flash the module with the latest GM software updates for your specific 1998 Envoy. Just provide your VIN at checkout.
- ✔ Plug-and-Play Installation: Once you receive the module, it’s ready to install. No dealer intervention or additional programming is required.
- ✔ Solves Common Problems: An effective fix for issues like rough idle, harsh shifting, false sensor codes, and intermittent stalling.
- ✔ OEM Reliability: This is a genuine OEM part, ensuring proper function and durability.
Easy Installation Guide
Installing your new PCM is a straightforward job you can do in your driveway. Here’s a simple guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On the 1998 GMC Envoy, the PCM is typically located in the engine compartment on the right-hand (passenger) side.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old module. Inspect the connectors for any signs of corrosion or bent pins and clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the wiring harnesses.
- Reconnect the Battery: Reattach the negative battery terminal. Your vehicle is now ready to start.
Part Number Compatibility
This module is a direct replacement for several part numbers. Please verify that your original module has one of the following numbers printed on the label:
09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810
Vehicle Fitment Information
This Electronic Control Module fits a wide range of GM vehicles that use service ID 9355699. Please check your specific application below:
- ASTRO 98: Electronic Control Module; (LH front by battery), ID 9355699
- BLAZER S10/JIMMY S15 98: Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
- BRAVADA 98: Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 9355699
- CHEVROLET 1500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- CHEVROLET 2500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- CHEVROLET 3500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- ENVOY 98: Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
- ESCALADE 99: Electronic Control Module; (LH front engine compartment), ID 9355699
- EXPRESS 1500 VAN 98-99: Electronic Control Module; ID 9355699
- EXPRESS 2500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
- EXPRESS 3500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
- GMC 1500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- GMC 2500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- GMC 3500 PICKUP 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- ISUZU HOMBRE 98: Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 9355699
- S10/S15/SONOMA 98: Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 9355699
- SAFARI (GMC) 98: Electronic Control Module; (LH front by battery), ID 9355699
- SAVANA 1500 VAN 98-99: Electronic Control Module; ID 9355699
- SAVANA 2500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
- SAVANA 3500 VAN 98-99: Electronic Control Module; gasoline, ID 9355699
- SUBURBAN 1500 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- SUBURBAN 2500 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- TAHOE 98-99: Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
- YUKON 98-99: Electronic Control Module; (LH engine compartment), ID 9355699