Engine Check light (Error Code 0502) Error code PO502 in an Isuzu refers to a vehicle speed sensor circuit low input. This code is usually triggered when the vehicle's computer detects a lower than expected signal from the vehicle speed sensor (VSS). The VSS is responsible for sending speed-related information to the engine control module (ECM) or transmission control module (TCM), To resolve the P0502 error code in an lsuzu, you can try the following steps: Check the wiring and connections: Ins

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