P1C22 – 12V Auxiliary Battery Voltage Too Low

P1C22 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1C22 Possible Causes

Faulty 12V Auxiliary Battery,12V Auxiliary Battery harness is open or shorted,12V Auxiliary Battery circuit poor electrical connection

P1C22 Description

The Engine Control Module (ECM) monitors the 12V Auxiliary Battery. The ECM sets the OBDII code when the 12V Auxiliary Battery is not to factory specifications.