Pre-Collision System Malfunction
2023-2023 Tesla Model 3 Standard Range Single Motor RWD
The 2023 Tesla Model 3 is equipped with a Standard Range Single Motor RWD engine (RWD). Below you'll find detailed c0420 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
General fault in the pre-collision system that prepares or initiates emergency braking.
Symptoms
- Pre-collision system warning light
- Automatic emergency braking disabled
- Forward collision alert unavailable
- Driver assist systems degraded
Common Causes
- Radar or camera sensor fault
- Control module failure
- Brake system fault preventing intervention
- CAN communication error between modules
Diagnostic Steps
- Check for radar and camera codes first
- Verify brake system is fully operational
- Test CAN communication between PCS modules
- Check all sensor alignments
- Inspect wiring to PCS components
Repair Notes
Diagnose root sensor or communication fault. PCS depends on multiple subsystems.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0026RF Wheel Speed Sensor Circuit Intermittent
- C0027LR Wheel Speed Sensor Circuit Intermittent
- C0028RR Wheel Speed Sensor Circuit Intermittent
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Front Wheel Speed Signal Erratic
C0420 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
2017-2017 Long Range Dual Motor AWD
Tesla Model 3
2017-2017 Performance Dual Motor AWD
Tesla Model 3
2017-2017 Standard Range Plus Single Motor RWD
Tesla Model 3
2018-2018 Long Range Dual Motor AWD
Tesla Model 3
2018-2018 Performance Dual Motor AWD
Common Questions
What does code C0420 mean on a 2023-2023 Tesla Model 3?
C0420 stands for "Pre-Collision System Malfunction". General fault in the pre-collision system that prepares or initiates emergency braking.
What are the symptoms of C0420 on a Tesla Model 3?
Common symptoms of C0420 include: Pre-collision system warning light, Automatic emergency braking disabled, Forward collision alert unavailable, Driver assist systems degraded.
What causes C0420 on a 2023-2023 Tesla Model 3?
Common causes of C0420 include: Radar or camera sensor fault, Control module failure, Brake system fault preventing intervention, CAN communication error between modules.
Last updated: March 2026