Restore Your GM Truck’s Reliability
If you’re dealing with a frustrating check engine light, poor fuel mileage, or unpredictable stalling in your 1997 Chevy S10, GMC Sonoma, or another compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. I’ve seen it countless times in my 20+ years on the shop floor: what seems like a complex mechanical issue is actually the vehicle’s computer giving up. This isn’t just an inconvenience; it affects performance, fuel economy, and your peace of mind. This replacement PCM is the direct, reliable solution to get your truck or van running like it should.
We take the guesswork and high dealership costs out of the equation. Each module is meticulously programmed with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) after you place your order. This ensures that when the part arrives, it’s ready to be installed, communicating perfectly with your engine and transmission, and restoring factory performance. It’s the most effective way to solve those persistent electronic gremlins for good.
Common Signs of a Failing PCM
- ✔ Unexplained Check Engine Light (CEL) with codes like P0601, P0604, or P0606.
- ✔ The engine cranks but refuses to start.
- ✔ Rough or erratic idling and stalling.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Harsh or incorrect shifting from the automatic transmission.
- ✔ Communication errors with scan tools.
- ✔ Intermittent issues that disappear and reappear without reason.
Case Study: A Tricky Diagnosis
A customer brought in a ’97 Jimmy S15 with the 4.3L V6. The complaint was intermittent stalling at stoplights and a persistent P0300 (Random Misfire) code that wouldn’t go away, even after a full ignition system replacement—plugs, wires, cap, and rotor. We checked fuel pressure, and vacuum lines, and even scoped the injectors. Everything looked fine. The misfire data on the scan tool was all over the place. On a hunch, I monitored the PCM’s sensor data streams. I noticed the injector pulse width commands were becoming erratic just before a stall. After swapping in a known-good test PCM, the problem vanished instantly. The original module had an internal driver failure that was intermittently failing under heat soak. This is a classic failure mode for this 1997 S10 PCM and its counterparts, and this replacement unit is the definitive fix.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- ✔ Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- ✔ Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. These connectors have locking tabs, so be gentle to avoid breaking them.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few small bolts.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Final Step: In some cases, a security relearn procedure may be necessary. This can typically be done by turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service information for specific steps if needed.
Will This Fit My Vehicle?
This module, part number 16229684, is a direct-fit replacement for a wide range of 1997 General Motors trucks and vans. Please verify your part number and vehicle from the list below to ensure compatibility. This unit is the correct Electronic Control Module for the following vehicles:
ASTRO (LH front by battery)
BLAZER S10/JIMMY S15 (6-262, 4.3L)
BRAVADA (6-262, 4.3L)
CHEVROLET 1500/2500/3500 PICKUP (gasoline)
EXPRESS 1500/2500/3500 VAN (gasoline)
GMC 1500/2500/3500 PICKUP (gasoline)
ISUZU HOMBRE (4.3L, 6 cylinder)
S10/S15/SONOMA (6-262, 4.3L)
SAFARI (GMC) (LH front by battery)
SAVANA 1500/2500/3500 VAN (gasoline)
SUBURBAN 1500/2500 (gasoline)
TAHOE (gasoline)
YUKON (gasoline)
Do I need to get this programmed by a dealer?
Do I need to get this programmed by a dealer?
No. We handle the programming for you before we ship the part. Simply provide your vehicle’s VIN during checkout, and it will arrive ready to install with the latest GM software updates for your specific vehicle.
What does the PCM actually do?
The Powertrain Control Module (PCM) is the main computer for your vehicle’s engine and transmission. It controls critical functions like fuel injection, ignition timing, and transmission shift points to ensure optimal performance, fuel economy, and emissions.
Is this a guaranteed fix for my check engine light?
If your vehicle has been properly diagnosed and the PCM is the confirmed point of failure (often indicated by codes like P0601 or P0606), then this part will resolve the issue. A check engine light can be caused by many different components, so proper diagnosis is key.
What part numbers does this replace?
This module is a direct replacement for part numbers 16229684 and 8162296840. Please check the number on your original module to confirm a match.