Restore Peak Performance to Your GM Truck or Van
Is your truck or van suffering from frustrating issues like a persistent check engine light, poor fuel mileage, stalling, or a no-start condition? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. This isn’t just an inconvenience; it affects your vehicle’s reliability and safety. This listing is for a dependable, genuine OEM Powertrain Control Module, part number 9355699, that serves as a direct-fit replacement for a wide range of popular 1998-1999 GM vehicles, including the 1998 Isuzu Hombre.
What makes this solution stand out? We take the guesswork and high cost out of the repair. Each module is professionally programmed (flashed) with the latest GM software updates specifically for your vehicle using the VIN you provide. This means it arrives ready for installation, with no need for an expensive trip to the dealership for programming. It’s a cost-effective and straightforward way to get your vehicle running right again.
From the Diagnostic Bay
I remember a 1999 Chevy Suburban that came into the shop with a complaint of intermittent stalling and a whole Christmas tree of seemingly unrelated sensor codes. The owner had already replaced the throttle position sensor and the mass air flow sensor with no luck. After hooking up my high-end scan tool, I noticed the 5-volt reference signal was dropping out sporadically. Instead of chasing more sensors, I went straight to the PCM. A quick tap test on the module housing caused the engine to stumble immediately. The problem wasn’t the sensors; it was a failing driver circuit inside the PCM. We replaced it with a VIN-programmed unit just like this one, and the truck ran perfectly. This simple swap saved the customer hundreds in unnecessary parts and diagnostic time.
Is Your Truck or Van Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Check Engine Light (CEL) is on with communication codes (e.g., U0100) or internal fault codes (e.g., P0601, P0606).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially after warming up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle fails to pass an emissions test.
- ✔ Your scan tool cannot communicate with the PCM.
Your Straightforward Installation Guide
Installing your pre-programmed 1998 Isuzu Hombre PCM is a job most DIYers can handle in under an hour with basic hand tools. Following these steps ensures a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, often on the driver’s side fender well or near the battery. Refer to your vehicle’s service manual for the exact location.
- Disconnect the Connectors: Carefully unlatch and remove the electrical connectors from the old PCM. Inspect the terminals for any corrosion or damage. Clean them with an electrical contact cleaner if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the mounting hardware, as you will reuse it.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors into the new PCM, ensuring they click into place. Reconnect the negative battery terminal.
- Final Step (If Applicable): Some vehicles require a security relearn procedure (often called a Passlock or Passkey relearn), which typically involves cycling the key in the ignition. This procedure can usually be found online or in your owner’s manual and requires no special tools.
Verified Fitment for a Wide Range of GM Vehicles
This module is a confirmed fit for vehicles requiring part number 9355699. Please match your original part number to ensure compatibility. This unit is interchangeable with the following part numbers: 16266645, 16250279, 16258815, 09366810, and 9366810. It fits a vast array of GM models, including:
- Isuzu Hombre (1998)
- Chevrolet & GMC Pickups (1500, 2500, 3500) (1998-1999)
- Chevrolet Express & GMC Savana Vans (1500, 2500, 3500) (1998-1999)
- Chevrolet Tahoe & GMC Yukon (1998-1999)
- Cadillac Escalade (1999)
- Chevrolet Suburban (1500, 2500) (1998-1999)
- Chevrolet Astro & GMC Safari (1998)
- Chevrolet S10, GMC Sonoma, Blazer, Jimmy (1998)
- Oldsmobile Bravada & GMC Envoy (1998)
Note: Specific engine and option codes may apply. Please verify the ID 9355699 on your original module.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential because it allows us to program the PCM with the exact software calibration for your vehicle’s engine, transmission, and emissions equipment. This ensures seamless communication between all modules and guarantees proper vehicle operation right out of the box.
Is this a brand new part?
No, this is a genuine, used OEM part sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested before being programmed with the latest GM software. This provides OEM reliability at a fraction of the cost of a new unit.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0606) or a faulty component driver circuit within the module, then yes, this will resolve the issue. However, if the light is on due to a bad sensor or another component, that part will still need to be repaired separately.
Do I need a mechanic to install this?
For most people with basic mechanical skills, this is a straightforward DIY installation. The key benefit of our service is that the programming is already done. However, if you are not comfortable working on your vehicle, we always recommend seeking assistance from a qualified professional mechanic.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM (Engine Control Module) typically just controls engine functions. PCM (Powertrain Control Module) is more common in modern vehicles and controls both the engine and the transmission, which is the case for this module.