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If you have one of the glow plug connectors corroded off, that will not set a P0380 code.

Conditions for Setting DTC P0380
• PCM has commanded glow plugs ON and
voltage at the glow plugs is less than 4.0 volts.
or
• PCM has commanded glow plugs OFF and
voltage at the glow plugs is greater than
4.0 volts.
or
• PCM has commanded glow plugs ON and there
is more than a 2 volt difference between glow
plug voltage and ignition voltage.
 
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