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DTC P1388: Auto Shutdown Relay Control Circuit: Description

Auto Shutdown (ASD) relay operation is monitored with ignition on and battery voltage more than 10.4 volts. DTC will set in Powertrain Control Module (PCM) memory when PCM senses an open or short condition in ASD relay circuit. Possible causes for DTC to set are: defective ASD relay, defective PCM, defective connectors or defective wiring.