P1393 Code: Meaning, Causes, and Symptoms | OBD2 Codes

P1393 – Glow Plug Circuit Low Input Bank 2

 

P1393 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

P1393 Possible Causes

 

Faulty glow plug relay,Faulty glow plug shunt,Faulty glow plugs,Glow plugs harness is open or shorted,Glow plugs circuit poor electrical connection,Faulty Powertrain Control Module (PCM)

 

P1393 Description

 

The glow plug system is monitored when the glow plugs are commanded on for more than 35 seconds and battery voltage is between 11.5-14 volts.