P2500high severityPowertrain
Generator Lamp/L Terminal Circuit Low
on 2016 GMC Sierra 1500 5.3L V8 · 4WD
What this code means
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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1