Generator Lamp/L Terminal Circuit Low
2002-2002 Dodge Ram 2500 5.9L I6 Cummins Diesel
The 2002 Dodge Ram 2500 is equipped with a 5.9L inline-6 diesel engine. 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
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P2500 on Other Vehicles
Common Questions
What does code P2500 mean on a 2002-2002 Dodge Ram 2500?
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 Dodge Ram 2500?
Common symptoms of P2500 include: Battery light on, Low charging voltage, Check engine light.
What causes P2500 on a 2002-2002 Dodge Ram 2500?
Common causes of P2500 include: Broken exciter wire, Failed voltage regulator, Corroded alternator connector, Blown dash bulb.
Last updated: March 2026