Daytime Running Light Module Circuit
2017-2020 Tesla Model 3 Standard Range Plus Single Motor RWD
Description
Malfunction in the daytime running light (DRL) module or circuit.
Symptoms
- DRLs not illuminating
- DRLs always on even with headlights on
- DRL brightness incorrect
- DRL warning message on display
Common Causes
- Faulty DRL module
- Burnt out DRL bulb/LED
- Wiring issue
- BCM DRL output fault
- Light sensor input error
Diagnostic Steps
- Check DRL bulbs/LEDs
- Test DRL module power and ground
- Inspect wiring
- Scan BCM for DRL codes
- Test light sensor input
Repair Notes
Replace DRL bulbs/LEDs or DRL control module.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0007Rear Left Side Airbag Deployment Circuit
- B0008Rear Right Side Airbag Deployment Circuit
- B0009Rear Center Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
B2101 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
2021-2024 Long Range Dual Motor AWD
Tesla Model 3
2021-2024 Performance Dual Motor AWD
Tesla Model 3
2021-2024 Standard Range Single Motor RWD
Common Questions
What does code B2101 mean on a 2017-2020 Tesla Model 3?
B2101 stands for "Daytime Running Light Module Circuit". Malfunction in the daytime running light (DRL) module or circuit.
What are the symptoms of B2101 on a Tesla Model 3?
Common symptoms of B2101 include: DRLs not illuminating, DRLs always on even with headlights on, DRL brightness incorrect, DRL warning message on display.
What causes B2101 on a 2017-2020 Tesla Model 3?
Common causes of B2101 include: Faulty DRL module, Burnt out DRL bulb/LED, Wiring issue, BCM DRL output fault, Light sensor input error.