Body
Generic/SAE
OBD-II Fault Code
B2347: Mirror Switch Reference Voltage Positive Common Supply Low Voltage
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for B2347.
Body access / door
Use this category to narrow your checks before replacing parts.
Low
Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.
What B2347 usually means
Mirror Switch Reference Voltage Positive Common Supply Low Voltage.
Common symptoms
Body/accessory warning lamp or feature not working
Likely causes
Faulty switch/actuator; Broken wiring in door hinge area; Blown fuse; Module coding/calibration issue; Low signal voltage; Weak power supply; High resistance/poor ground; Failed sensor
Diagnostic checks
Check related fuses, connectors, grounds and switch/module power supply; Check switch input, actuator output, fuse and door-jamb wiring; Check sensor reference voltage, ground and signal voltage
Repair guidance
Repair broken wiring, replace failed switch/actuator, recalibrate if required; Repair poor ground/power feed or replace confirmed faulty sensor
Verification after repair
Operate the affected body/accessory system and rescan