OBDII P0128 thermostat question

[davehatch]

My 2003 Vibe GT (90000mi) check engine light came on tonite....my OBDII scanner said "P0128" which is "coolant temp below thermostat regulating temp". The car drives fine, runs smooth, coolant/oil levels ok, air filter clean, etc. All other gauges on the dash read fine. Is this a thermostat problem, or a sensor problem or both? Anyone else have this type of problem or OBDII code? The gas cap is tight too. I just had the antifreeze changed about six months ago (roughly about 12,000 miles ago) by a reputable (one I trust) dealer. Any suggestions? Thanks in advance and you can also email me at dhatch@myvine.com

[joatmon]

glad to see you still got the vibe (You know you can post here more often than every other year )johnsoax had a similar problem, replaced the thermostat, I think that fixed it for himhttp://forums.genvibe.com/zerothread?id=16307

[davehatch]

thanks for the info....I cleared the code and will keep an eye on it....if the cel comes on again I'll replace the thermostat.....