P3046critical severityPowertrain
DCT Mechatronic Unit Internal Fault
on 2021 Polestar 2 Long Range Single Motor FWD · AWD
What this code means
The mechatronic unit (combined TCM and hydraulic valve body in DCT transmissions) has detected an internal electronic or hydraulic fault.
Symptoms
- Check Engine Light
- Transmission warning light
- Multiple gear selection faults
- Erratic shifting behavior
- Limp mode in fixed gear
- Loss of drive intermittently
Common causes
- Mechatronic electronic board failure
- Internal solenoid failure
- Hydraulic valve body wear
- Pressure accumulator leak
- Temperature sensor within unit failed
Diagnostic steps
- Read mechatronic unit internal fault codes
- Check hydraulic fluid level in mechatronic
- Monitor solenoid commands vs responses
- Test temperature sensor readings
- Perform mechatronic self-test sequence
Repair notes
Replace or rebuild mechatronic unit. Some manufacturers offer refurbished units. Requires special filling and bleeding procedures.
Other Powertrain codes on this vehicle
P0070
Ambient Air Temperature Sensor Circuit
P0071
Ambient Air Temperature Sensor Range/Performance
P0072
Ambient Air Temperature Sensor Circuit Low
P0073
Ambient Air Temperature Sensor Circuit High
P0115
Engine Coolant Temperature (ECT) Sensor 1 Circuit
P0116
ECT Sensor 1 Circuit Range/Performance
P0117
ECT Sensor 1 Circuit Low Input
P0118
ECT Sensor 1 Circuit High Input
P0119
ECT Sensor 1 Circuit Intermittent
P0125
Insufficient Coolant Temperature for Closed Loop Fuel Control