Is Your Oldsmobile Alero Running Rough?
A failing Powertrain Control Module (PCM), the electronic brain of your vehicle, can be the source of countless frustrating and hard-to-diagnose issues. If your 1999 Oldsmobile Alero is experiencing erratic behavior, poor fuel economy, or has a persistent Check Engine Light, a faulty PCM is a likely culprit. This vital component controls everything from fuel injection and ignition timing to transmission shifting and emissions systems. When it starts to fail, the symptoms can be unpredictable and concerning. Don’t let a bad module keep you off the road. We offer a reliable, direct-fit solution to restore your vehicle’s performance and dependability.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on, often with communication-related error codes (U-codes) or multiple, seemingly unrelated codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ The engine cranks but refuses to start, even with a good battery and starter.
- ✔ Failure to pass an emissions test.
- ✔ Intermittent issues that disappear and then return without warning.
From the Diagnostic Bay
We had a 1999 Alero with the 3.4L V6 come into the shop that was driving the owner crazy. It would randomly stall at stoplights, but only when the engine was warm. Other times, the transmission would slam into gear. The owner had already replaced the spark plugs, wires, and a couple of sensors with no luck. We hooked up our professional scan tool and noticed the live data stream from the PCM was dropping out intermittently. All signs pointed to an internal failure in the module. We installed one of our pre-programmed PCMs, keyed to the customer’s VIN, and performed the security relearn procedure. The car immediately ran like new. The stalling vanished, the shifts were smooth, and the customer was thrilled to have their reliable car back. It’s a classic case of how a failing PCM can mimic a dozen other problems.
The Plug-and-Play Solution: A Programmed 1999 Alero PCM
Replacing the PCM on your GM vehicle isn’t as simple as swapping the part. The module contains vehicle-specific software that must match your car’s VIN, options, and security system. Our service eliminates the need for an expensive trip to the dealership for programming. When you order from us, you provide your vehicle’s VIN, and we flash the module with the latest GM-certified software updates specifically for your car. This ensures perfect compatibility and function right out of the box. Your new 1999 Alero PCM will arrive ready for installation, saving you time, money, and hassle.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles from the late 90s. Please verify your part number or vehicle application from the list below. This unit is compatible with service numbers: 09356741, 16236757, 9357034, 9357440, and 9366314.
This part will fit these makes and models with these options:
- ALERO 99: Electronic Control Module; (LH center dash), 3.4L, ID 16236757, 9356741, 9357440
- ACHIEVA 98: Electronic Control Module; 6-191 (3.1L)
- BONNEVILLE 98: Electronic Control Module
- CAMARO 98: Electronic Control Module; 6-231 (3.8L)
- CENTURY 98: Electronic Control Module; (6-191, 3.1L)
- CUTLASS 98-99: Electronic Control Module
- EIGHTY EIGHT 98: Electronic Control Module
- FIREBIRD 98: Electronic Control Module; 6-231 (3.8L)
- GRAND AM 98-99: Electronic Control Module; 3.1L & 3.4L options
- GRAND PRIX 98: Electronic Control Module
- INTRIGUE 98: Electronic Control Module
- LESABRE 98: Electronic Control Module; (6-231, 3.8L)
- LUMINA CAR 98: Electronic Control Module; (LH engine compartment)
- MALIBU 98: Electronic Control Module; 6-191 (3.1L)
- MONTE CARLO 98: Electronic Control Module
- PARK AVENUE 98: Electronic Control Module; (6-231, 3.8L)
- REGAL 98: Electronic Control Module
- RIVIERA 98: Electronic Control Module; (6-231, 3.8L)
- SILHOUETTE 98: Electronic Control Module; (LH engine compartment)
- SKYLARK 98: Electronic Control Module; 6-191 (3.1L)
- TRANS SPORT 98: Electronic Control Module; (LH engine compartment)
- VENTURE 98: Electronic Control Module; (6-207, 3.4L)
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before we ship the part. We use your VIN to load the correct GM software and updates, so it’s ready for installation when you receive it.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
Is this a difficult part to install?
For most of the listed vehicles, the PCM is in an accessible location (like the LH center dash or engine compartment). Installation typically involves disconnecting the battery, unplugging the old module’s electrical connectors, unbolting it, and then reversing the process with the new one. Basic hand tools are usually all that’s required.
Will I need to perform a security relearn procedure?
Yes, on most GM vehicles of this era, you will need to perform a simple security relearn procedure after installation. This syncs the new PCM with your vehicle’s anti-theft system and keys. The procedure is simple, takes about 30 minutes, and does not require any special tools. We can provide instructions upon request.
What if I order the wrong part?
By providing your VIN, we ensure you receive the correct, compatible part for your specific vehicle. This eliminates the guesswork and guarantees a proper fit and function. If you have any doubts, please contact us with your VIN before ordering.