Generator Lamp/L Terminal Circuit Low
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 p2500 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
Low signal on the alternator lamp/exciter circuit, preventing proper charging regulation.
Symptoms
- Battery light on
- Low charging voltage
- Check engine light
Common Causes
- Broken exciter wire
- Failed voltage regulator
- Corroded alternator connector
- Blown dash bulb
Diagnostic Steps
- Check charging system voltage
- Inspect alternator connector
- Measure exciter circuit voltage
Repair Notes
Repair exciter circuit wiring or replace alternator.
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
P2500 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 P2500 mean on a 2023-2023 Tesla Model 3?
P2500 stands for "Generator Lamp/L Terminal Circuit Low". Low signal on the alternator lamp/exciter circuit, preventing proper charging regulation.
What are the symptoms of P2500 on a Tesla Model 3?
Common symptoms of P2500 include: Battery light on, Low charging voltage, Check engine light.
What causes P2500 on a 2023-2023 Tesla Model 3?
Common causes of P2500 include: Broken exciter wire, Failed voltage regulator, Corroded alternator connector, Blown dash bulb.
Last updated: March 2026