What's the 00652 vw code?

The 00652 code on a Volkswagen stands for Gear Monitoring: Implausible Signal. What this is stating is that the ratio of engine speed to the output speed from the gearbox in the current gear isn't very likely, or that the slip RPM with the torque converter lock-up clutch not engaged has to be greater than the stall speed. Some reasons You'd see this is if the ATF fluid level is diMINIshed, if the gearbox speed sensor is d***y or malfunctioning, or if the ATF pump has started to fail. Given the symptoms, some simple things You can try will be checking Your automatic transmission fluid level, replacing the vehicle speed sensor, replacing the gearbox speed sensor, and checking the clutch body.