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P0128 Diagnostic Trouble Code Discussion for June 2006

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2000 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K5Y
P0128: coolant temp below threshold. Hi Guys! I have had this vehicle into my shop occasionally and have seen a stored DTC PO128 for cooling system temp below threshold value. Since the complaint seemed to be intermittant I replaced the thermostat and gasket first trip in. Next trip (still interm...
June 29, 2006