Is Your GM Truck or Van Running Rough? The PCM Might Be the Culprit.
If your late-90s Chevrolet or GMC vehicle is suffering from mysterious and frustrating issues like stalling, erratic shifting, poor fuel economy, or a persistent Check Engine Light, the problem may lie deep within its electronic nervous system: the Powertrain Control Module (PCM). This vital component acts as the brain of your engine and transmission, and when it fails, it can cause a cascade of problems that are often misdiagnosed. Don’t waste time and money replacing perfectly good sensors. This genuine, used GM PCM is the reliable and cost-effective solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
I once had a 1999 Chevy Suburban come into the shop that had its owner at his wit’s end. He’d replaced the throttle position sensor, the mass air flow sensor, and even the fuel pump, but the truck still idled poorly and would occasionally stall at red lights. The codes were all over the place. After hooking up the scan tool and watching the live data, I noticed the injector pulse width was erratic and didn’t correspond with engine load. That pointed me directly to the PCM. We swapped in a VIN-programmed module just like this one, performed the security relearn, and the truck ran like it just rolled off the showroom floor. It’s a classic case of the symptoms pointing everywhere except the real source: the computer itself.
Symptoms of a Failing Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with various, often inconsistent, trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or erratic idling.
- ✔ Harsh or unpredictable automatic transmission shifting.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Communication errors with diagnostic scan tools.
The Direct-Fit Solution: A Pre-Programmed GM Truck PCM 9355699
Replacing a PCM isn’t as simple as swapping a battery. Modern vehicle computers are coded specifically to the Vehicle Identification Number (VIN) of the car they belong to. This ensures all systems, from the engine and transmission to the anti-theft security, function correctly. Our service eliminates the need for an expensive trip to the dealership. We take a thoroughly inspected, genuine used GM module and flash it with the latest official GM software calibration for your specific vehicle. All you have to do is provide us with your VIN during checkout.
This process ensures that when you receive your replacement GM Truck PCM 9355699, it’s ready for a straightforward installation. In most cases, after installation, you will only need to perform a simple security relearn procedure, which can often be done without special tools. This gets your truck, van, or SUV back on the road quickly, running on the most stable and efficient software available from the original manufacturer.
Key Benefits of This Module:
- ✔ VIN-Programmed for Your Vehicle: We flash the module with your truck’s specific VIN and the latest GM software updates before shipping.
- ✔ OEM Reliability: This is a genuine GM part sourced from a salvaged vehicle, not a low-quality aftermarket alternative.
- ✔ Cost-Effective Repair: Avoid the high costs of a new module and dealership programming fees.
- ✔ Broad Compatibility: This module, identified by part number 9355699 and its alternates, fits a wide range of popular 1998-1999 GM vehicles, including the Express, Savana, Tahoe, Yukon, Suburban, and various pickups. Please verify your part number and consult the fitment list.
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must send us your vehicle’s 17-digit VIN. We cannot program and ship the module without it. You can add it as a note during checkout or send us a message immediately after your purchase.
Is any additional programming required after installation?
Our programming covers the engine and transmission software. However, you will likely need to perform a security relearn procedure (sometimes called a CASE relearn or anti-theft relearn) to sync the PCM with your vehicle’s keys and security system. This procedure is typically simple and can be found online or in a service manual.
Is this a new part?
No, this is a genuine, used OEM part that has been carefully sourced from a salvaged vehicle. We inspect each unit to ensure it is in good working condition before programming and shipping.
How do I know if this PCM will fit my vehicle?
This module replaces part number 9355699 and several other interchangeable numbers listed in the description. The best way to ensure compatibility is to match the part number from your original module. Please also review the detailed fitment list provided.
What if my original part number isn’t listed?
If your part number is not on the list, this module may not be the correct one for your vehicle. We recommend contacting us with your VIN and original part number so we can help you find the right component.