B1318 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B1318 – Battery Voltage Low


B1318 Possible Symptoms


Engine Light ON (or Service Engine Soon Warning Light)


B1318 Possible Causes


Battery defective,Loose or missing alternator drive belt,Faulty Alternator,Alternator harness is open or shorted,Alternator circuit poor electrical connection,Faulty Powertrain Control Module (PCM)


B1318 Description


With the engine running, the charging system supplies voltage to the battery and the vehicle electrical system through the battery B+ cable. The voltage that is supplied to the vehicle electrical system is used for the operation of the various vehicle systems and modules. Many modules monitor this voltage and if it rises above or below their calibrated setpoints, a Diagnostic Trouble Code (DTC) sets.