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P0128 Diagnostic Trouble Code Discussion for November 2005

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2001 BMW 325i 2.5L MIL Lamp on VIN: WBAAW33481
P0128: engine running below temperature. the check engine light comes on coded for po128. we cleared light with service - checked coolant - level and condition ok. after about a week light came on. ran tests with modis - coolant temperature is normal. engine not overheating. heat works well. cannot f...
November 16, 2005
2000 Pontiac Bonneville SE 3.8L Stall VIN: 1G2HZ541Y4
P0128: coolant thermostat. vehile has stalled 3 x's on customer but not for me,at 70 mph and 30 mph and at stop sign, but has restarted everytime I have scoped the crank sensor, but checks out ok, Jim
November 21, 2005