The P0852 code in your 2022 Mercedes-Benz E-Class indicates the park/neutral switch input circuit is providing a higher voltage signal than expected. This affects gear position detection for starting and display functions.
Understanding High Circuit Voltage
The E-Class transmission range sensor provides voltage signals corresponding to gear selection. High voltage typically indicates an open ground or short to power affecting the signal circuit.
Common Causes of P0852
- Open circuit in sensor ground
- Short to battery voltage
- Sensor internal failure
- Disconnected wiring
- Connector damage
- TCM input circuit issues
Symptoms of High Circuit Voltage
- Gear position always reads one selection
- Check engine light on
- Start permission issues
- Display shows incorrect gear
- Backup features affected
- Parking sensor integration issues
Mercedes Electronic Shifter
The E-Class uses an electronic gear selector with no mechanical linkage. The transmission range sensor is the only way the vehicle knows what gear is selected.