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The code 00652 on a Volkswagen indicates an issue with Gear Monitoring: Implausible Signal. This means that the relationship between the engine speed and the gearbox output speed in the current gear is unlikely, or that there is excessive RPM difference when the torque converter lock-up clutch is not engaged. Common causes for this issue may include low ATF fluid level, a faulty or malfunctioning gearbox speed sensor, or ATF pump failure. To address this problem, you can start by checking the automatic transmission fluid level, replacing the vehicle speed sensor, replacing the gearbox speed sensor, and inspecting the clutch body based on the observed symptoms.
The Volkswagen error code 00652 indicates that there is an improbable signal detected in the gear monitoring system.