Body
Generic/SAE
OBD-II Fault Code
B2373: LED #1 Circuit Short to Battery
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2373.
Power supply / charging
Use this category to narrow your checks before replacing parts.
High
Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.
What B2373 usually means
LED #1 Circuit Short to Battery.
Common symptoms
Body/accessory warning lamp or feature not working
Likely causes
Weak battery; Charging system fault; Loose/corroded terminals; Poor ground; Wire shorted to power feed; Incorrectly repaired harness; Internal component short
Diagnostic checks
Check related fuses, connectors, grounds and switch/module power supply; Test battery state of charge and charging voltage; Inspect terminals and ground straps; Check for unwanted voltage on signal/control circuit
Repair guidance
Clean/tighten terminals, replace weak battery, repair alternator/charging circuit as needed; Repair harness short to power or replace internally shorted component
Verification after repair
Operate the affected body/accessory system and rescan