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Symptom List: P0380-GLOW PLUG CIRCUIT A OPEN CIRCUIT Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0380-GLOW PLUG CIRCUIT A When Monitored and Set Condition: P0380-GLOW PLUG CIRCUIT A OPEN CIRCUIT When Monitored: With the ignition on and glow plug operation not active. Set Condition: The ECM does not detect voltage on the Glow Plug Relay Control circuit when the relay is commanded off. P0380-GLOW PLUG CIRCUIT A SHORT CIRCUIT When Monitored: With the ignition on and when attempting to activate the Glow Plug Relay. Set Condition: The ECM detects excessive current on the Glow Plug Relay Control circuit when the glow plug relay is commanded on. POSSIBLE CAUSES INTERMITTENT CONDITION ECM/PCM RELAY OUTPUT CIRCUIT OPEN GLOW PLUG RELAY GLOW PLUG RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE GLOW PLUG RELAY CONTROL CIRCUIT SHORTED TO GROUND GLOW PLUG RELAY CONTROL CIRCUIT OPEN ENGINE CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → Go To 2 No → Go To 3 75 DRIVEABILITY - DIESEL |