Drivetrain wiring harnesses provide dedicated electrical connections for components managing engine and transmission operation. Typically routed from the powertrain control module (PCM) to sensors, actuators, and the transmission itself, these harnesses ensure reliable data and power delivery. Construction utilizes high-temperature resistant insulation and abrasion-resistant outer jacketing to withstand harsh under-vehicle environments. Modern harnesses often integrate shielded wiring for sensitive sensors like crankshaft position sensors, minimizing electromagnetic interference. Specific connectors are designed for secure mating and sealing against moisture and contaminants, maintaining system integrity. Replacement typically requires complete harness assembly due to integrated wiring and connector configurations.