P0688F Code: ECM/PCM Power Relay Sense Circuit Intermittent – How to Diagnose & Fix

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Are you getting the P0688F trouble code on your vehicle? In this video, we look at the ECM/PCM Power Relay Sense Circuit and how to troubleshoot an intermittent fault. Learn about possible causes, including a faulty power relay, damaged wiring, loose connections, corroded terminals, and circuit issues. We’ll cover key diagnostic checks to help you identify the problem before replacing parts. Causes & Fixes +1 In this video: What the P0688F code means Common symptoms and possible causes How to inspect the ECM/PCM power relay Checking fuses, wiring, and connectors Troubleshooting intermittent circuit faults Tips for diagnosing the problem Always refer to your vehicle's wiring diagram and manufacturer-specific repair procedures when testing the circuit. #P0688F #P0688 #OBD2 #CheckEngineLight #ECM #PCM #CarDiagnostics #CarRepair #PowerRelay