CVT Primary Pulley Speed Sensor Circuit
2014-2016 Tesla Model S P85D Dual Motor AWD
Description
The primary (input) pulley speed sensor in the CVT is reporting erratic or no signal. The TCM requires this signal for ratio control.
Symptoms
- Check Engine Light
- Transmission stuck in one ratio
- Erratic shifting
- Speedometer malfunction
- Limp mode
- Delayed engagement
Common Causes
- Faulty primary pulley speed sensor
- Damaged tone ring
- Sensor wiring damage
- Contaminated sensor tip
- TCM input circuit failure
Diagnostic Steps
- Read primary pulley speed PID
- Inspect sensor connector and wiring
- Check tone ring condition
- Test sensor resistance and air gap
- Compare primary to secondary sensor readings
Repair Notes
Replace primary pulley speed sensor. Inspect tone ring for damage or contamination.
Related Codes
Other Powertrain Codes
- P0070Ambient Air Temperature Sensor Circuit
- P0071Ambient Air Temperature Sensor Range/Performance
- P0072Ambient Air Temperature Sensor Circuit Low
- P0073Ambient Air Temperature Sensor Circuit High
- P0115Engine Coolant Temperature (ECT) Sensor 1 Circuit
- P0116ECT Sensor 1 Circuit Range/Performance
- P0117ECT Sensor 1 Circuit Low Input
- P0118ECT Sensor 1 Circuit High Input
- P0119ECT Sensor 1 Circuit Intermittent
- P0125Insufficient Coolant Temperature for Closed Loop Fuel Control
P3021 on Other Vehicles
Tesla Cybertruck
2024-2024 Cyberbeast Tri Motor AWD
Tesla Cybertruck
2024-2024 Dual Motor AWD
Tesla Cybertruck
2024-2024 Single Motor RWD
Tesla Model 3
2017-2020 Long Range Dual Motor AWD
Tesla Model 3
2017-2020 Performance Dual Motor AWD
Tesla Model 3
2017-2020 Standard Range Plus Single Motor RWD
Tesla Model 3
2021-2024 Long Range Dual Motor AWD
Tesla Model 3
2021-2024 Performance Dual Motor AWD
Common Questions
What does code P3021 mean on a 2014-2016 Tesla Model S?
P3021 stands for "CVT Primary Pulley Speed Sensor Circuit". The primary (input) pulley speed sensor in the CVT is reporting erratic or no signal. The TCM requires this signal for ratio control.
What are the symptoms of P3021 on a Tesla Model S?
Common symptoms of P3021 include: Check Engine Light, Transmission stuck in one ratio, Erratic shifting, Speedometer malfunction, Limp mode, Delayed engagement.
What causes P3021 on a 2014-2016 Tesla Model S?
Common causes of P3021 include: Faulty primary pulley speed sensor, Damaged tone ring, Sensor wiring damage, Contaminated sensor tip, TCM input circuit failure.