P2500
Generator Lamp/L Terminal Circuit Low
2004-2007 Buick Rainier 4.2L I6 🇨🇦
High SeverityPowertrain
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 2004-2007 Buick Rainier?
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 Buick Rainier?
Common symptoms of P2500 include: Battery light on, Low charging voltage, Check engine light.
What causes P2500 on a 2004-2007 Buick Rainier?
Common causes of P2500 include: Broken exciter wire, Failed voltage regulator, Corroded alternator connector, Blown dash bulb.