Electronic Parking Brake Control Module
2014-2016 Tesla Model S P85D Dual Motor AWD
Description
Internal fault in the electronic parking brake control module.
Symptoms
- EPB warning light on
- EPB functions inoperative
- Hill-hold not working
- Auto-hold not functioning
Common Causes
- EPB module internal failure
- Module software corruption
- Power supply issue to module
- CAN communication fault to module
Diagnostic Steps
- Check module power supply and ground
- Scan for CAN communication codes
- Attempt module reset
- Check for software updates
- Test module inputs and outputs
Repair Notes
Replace EPB control module. Requires programming and calibration.
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
C0123 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 C0123 mean on a 2014-2016 Tesla Model S?
C0123 stands for "Electronic Parking Brake Control Module". Internal fault in the electronic parking brake control module.
What are the symptoms of C0123 on a Tesla Model S?
Common symptoms of C0123 include: EPB warning light on, EPB functions inoperative, Hill-hold not working, Auto-hold not functioning.
What causes C0123 on a 2014-2016 Tesla Model S?
Common causes of C0123 include: EPB module internal failure, Module software corruption, Power supply issue to module, CAN communication fault to module.