Need engine diogram for 2007 buick lacross 3800 , po128 (ect)
The code is telling you the engine temp sensor is telling the computer the engine is not warming up as it should.
Sometimes the problem is the thermostat, or low coolant, and sometimes it is the temp sensor.
Check the engine temp with an inferred thermometer first.
Usually the engine temp sensor is a two wire sensor, yellow and black.
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