DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P0500
P0500 means the powertrain control module (PCM) has lost a valid vehicle speed signal from the vehicle speed sensor (VSS) or its circuit. The PCM compares the expected speed input against other data such as engine rpm, throttle position, and transmission output, and it sets this code when the speed reading is missing, erratic, or implausible.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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