If the glow plug indicator seems to operate normally and the P0381 continues to reset, suspect a defective glow plug or an open glow plug/heater circuit. Additional diagnostic notes: An easy method of testing glow plugs is to remove them from the engine, ground them, and apply 12-volts. If the glow plug begins to glow, it is functioning
Hyundai Santa Fe โ (Jan Kliment / Shutterstock) The most common signs of bad spark plugs in Hyundai Santa Fe are poor acceleration or hesitation, rough idle, engine misfires, poor fuel economy, check engine light illuminates, engine knocking noise, and sometimes hard starting. In worst case scenario, if the spark plugs are in really bad
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