C1284 Code: Meaning, Causes, and Symptoms | OBD2 Codes
C1284 – Oil Pressure Switch Fault
C1284 Possible Symptoms
Anti-Lock Brake System (ABS) Warning Light ON,Engine Light ON (or Service Engine Soon Warning Light)
C1284 Possible Causes
Faulty Oil Pressure Switch,Oil Pressure Switch harness is open or shorted,Oil Pressure Switch circuit poor electrical connection
The engine oil pressure switch is a normally open switch. When the oil pressure is within normal ranges, the engine oil pressure switch closes and sends a ground signal to the instrument cluster setting the oil pressure gauge to the normal or mid-range position. When the oil pressure is low, the engine oil pressure switch opens, removing the ground signal, and the instrument cluster commands the oil pressure gauge to the L (low) position.