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P0128 Diagnostic Trouble Code Discussion for May 2010

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2006 Pontiac G6 3.5L MIL Lamp on VIN: 1G2ZF55B86
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. ... light on. Retrieve dtc of p0128. Tstat temp low. I can view the pcm data & the pcm is seeing good ect temp, its 195 fully hot. Even the freeze frame data shows temp of 185. My question is how does the system work? does the data go from pcm, to cluster,...
May 05, 2010
2008 Chevrolet Silverado 1500 WT 4.3L MIL Lamp on, Temp gage drops out VIN: 1GCEC14X28
P0128: Cooling system temp below thermostatic operation. This truck came in with check engine light on. Had code po128 cooling temp below thermostatic operation. Customer said the temp gauge will also drop to cold and messege center says engine hot a/c is off in dash. Checked temp sender, gauge and wiring all check ...
May 20, 2010