2011 Chevy Traverse P069E, U0109, and U0100: Dashboard Power Loss & Engine Stalling Fix

I own a 2011 Chevrolet Traverse that is experiencing intermittent dashboard power loss. When parked, the vehicle will suddenly shut off completely and requires several minutes to restart—no warning noises or error indicators before this happens. If I'm driving, the car continues running but all dashboard instruments lose power. Each time this occurs, the traction control system disables first, and once it reactivates, dashboard functions return normally. The onboard diagnostic system has logged three fault codes: P069E (Fuel Pump Control Module Request Malfunction), U0109 (Lost Communication with Fuel Pump Control Module), and U0100 (Lost Communication with Engine Control Module/Powertrain Control Module A). I recently had maintenance work completed—including timing chain, thermostat, and water pump replacement. The mechanic suggested the ABS wiring might be at fault, but I believe this is unlikely based on the symptoms. Could this be related to a faulty fuel pump control module, an open circuit in its voltage supply, or a failed inertia switch? Are there known issues with the 2011 Traverse's CAN bus wiring (specifically pins 6 and 14) that could cause these codes and dashboard failures? Any insights or troubleshooting steps would be greatly appreciated—especially for this model year and engine configuration.