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P1620 Diagnostic Trouble Code Discussion for July 2010

Low Engine Coolant Switch Circuit Low Input

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Trouble Ticket Help Requests for DTC P1620
Help Request Posted
1999 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZF528XX
Customer may drive this car for days before it causes the light to come back on with these EGR faults. Voltage may be on the low side sitting in the shop but not this .04 volts and cannot duplicate this problem. Tried replacing valve twice using AC Delco parts...
July 06, 2010