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P0128 Diagnostic Trouble Code Discussion for November 2007

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2002 Kia Sportage 2.0L MIL Lamp on VIN: KNDJA623X2
P0128: Thermostat System Malfunction. stored code p0128. my research pointed me to thermostat or coolant temp sensor. got car in morning (cold). cts & iat within 2 degrees. engine only got up to 183 degrees. replaced therostat with kia part. still only 183. replaced with stant 195 degree. runs...
November 01, 2007
2004 Volkswagen Jetta TDI 1.9L MIL Lamp on VIN: 3VWRR69M04
P0128: thermostat temp below spec. ... some warranty repaires including mil on. vw states " perform 5051 fault check and retreived code p0128 thermostat regulating temp to cool, note: cust running biofuel. due to different heat burn with biofuel. causes engine ecu to misread warm up temp du...
November 12, 2007
2001 Kia Sportage 2.0L MIL Lamp on VIN: KNDJA72351
P0128: Thermostat System Malfunction. We have this sportage with a recurring p0128.Replaced t-stat 2 times...no change.I have read the bulletins for the housing,but ours has the correct one on it. we have worked on this vehicle since new.When sitting in the bay if let idling on its own,temp will n...
November 16, 2007
2003 Chevrolet Blazer Xtreme 4.3L Poor Fuel Economy VIN: 1GNCS18X83
P0128: ECT Sensor Below Thermostat Regulating Temperature. replaced coolant sensor & cleared codes(po128) two days later sends code po101 for maf clear codes & drive for a month. po128 for coolant sensor comes back on replace coolant sensor & clear codes again. two days later again code po101 for maf
November 29, 2007