P063B – Generator Voltage Sense Circuit Range/Performance

P063B Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P063B Possible Causes

Faulty Alternator,Alternator harness is open or shorted,Alternator circuit poor electrical connection,Faulty Powertrain Control Module (PCM)

P063B Description

The Powertrain Control Module (PCM) monitors the Generator (Alternator) voltage output. The PCM sets the OBDII code if the alternator output voltage is less than the Battery feed circuit voltage.