If you’re dealing with frustrating engine problems in your 1997 Oldsmobile Bravada or another compatible GM truck, you know how quickly a simple drive can turn into a diagnostic nightmare. A faulty Powertrain Control Module (PCM) is often the hidden culprit behind issues that seem impossible to pin down. As the central computer for your engine and transmission, when the PCM fails, it can cause everything from a no-start condition to poor fuel economy and erratic behavior. This isn’t just an inconvenience; it’s a critical failure that sidelines your vehicle.
This is a direct-fit replacement Powertrain Control Module for a wide range of 1997 GM vehicles, including the 1997 Bravada PCM. We take the guesswork and extra expense out of the repair. Before we ship it, we flash the module with the latest GM-released software updates, programming it specifically to your vehicle’s Vehicle Identification Number (VIN). This means no expensive trips to the dealership for programming—it arrives ready to install, helping you get back on the road quickly and affordably.
A Technician’s Notebook
I remember a 1997 GMC Jimmy with the 4.3L V6 that came into my shop with a maddeningly intermittent stalling problem. It would run fine for days, then die at a stoplight without warning and refuse to restart for an hour. The owner had already replaced the fuel pump and ignition module. We scanned it and found no hard codes, just a history of communication loss faults. After checking all the wiring, we suspected the PCM. On these older GM models, heat cycles can cause internal solder joints on the processor board to fail, leading to exactly this kind of unpredictable behavior. We installed a VIN-programmed PCM, performed the security relearn, and the problem was solved for good. It’s a classic failure I’ve seen dozens of times.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with communication codes (like U-codes) or internal processor fault codes (like P0601 or P0606).
- ✔ The engine cranks but will not start.
- ✔ Rough or unstable idling and frequent stalling.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Seeming failure of multiple unrelated sensors at once.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well, near the battery or airbox.
- ✔ Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. There are usually multiple color-coded connectors with locking tabs. Do not force them.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware as you may need to reuse it.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten it.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the correct ports on the new module. They are keyed to only fit one way. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You will likely need to perform a simple security relearn procedure (often called a CASE learn or Passlock relearn) so the vehicle recognizes the new PCM. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes and can be done without special tools.
Will This Fit My Vehicle?
This module, part number 16229684 (also compatible with 8162296840), is a guaranteed fit for the following 1997 models. Please provide your VIN upon purchase to ensure correct programming for your specific vehicle options.
- Oldsmobile Bravada: 1997 (4.3L, 6-262)
- Chevrolet Astro Van: 1997
- Chevrolet Blazer S10: 1997 (4.3L, 6-262)
- Chevrolet Pickups (1500, 2500, 3500): 1997 (Gasoline Engines)
- Chevrolet Express Van (1500, 2500, 3500): 1997 (Gasoline Engines)
- Chevrolet Suburban (1500, 2500): 1997 (Gasoline Engines)
- Chevrolet Tahoe: 1997 (Gasoline Engines)
- GMC Jimmy S15: 1997 (4.3L, 6-262)
- GMC Pickups (1500, 2500, 3500): 1997 (Gasoline Engines)
- GMC Safari Van: 1997
- GMC Savana Van (1500, 2500, 3500): 1997 (Gasoline Engines)
- GMC Sonoma S15: 1997 (4.3L, 6-262)
- GMC Yukon: 1997 (Gasoline Engines)
- Isuzu Hombre: 1997 (4.3L)
Do I need to do anything after installing this PCM?
Do I need to do anything after installing this PCM?
Yes. While the main engine and transmission programming is done for you, you will need to perform a security relearn procedure. This syncs the new PCM with your vehicle’s anti-theft system. It’s a simple process that typically takes about 30 minutes and does not require any special scan tools.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive the VIN, as the programming is specific to your vehicle.
Is this a reliable fix for a P0601 code?
Yes. The diagnostic trouble code P0601 specifically means “Internal Control Module Memory Check Sum Error.” This is a fatal error for the PCM, and replacement is the only correct repair. Our module is a direct solution for this and other internal PCM failure codes.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission shift points and line pressure. If your transmission issues are electronic in nature and caused by a failing PCM, this part will resolve them. However, it will not fix internal mechanical failures within the transmission itself.