Just recently purchased an 05 Sierra for next to nothing. I noticed the coolant temp sensor works intermittently. One of the times that the coolant temp sensor wasn’t working I plugged in my obd2 and went to look at the raw temp data. I noticed that while the coolant temp gauge said that the temp was at zero, the raw data was at the normal ~200 degrees.
Does this mean that there may not be something wrong with the sensor itself, but maybe the cluster or something in between the two? I additionally got other codes for a random misfire, knock sensors, and both fuel trims running rich, which I believe are all from the computer thinking the engine runs cold at all times. Another concern I have though is overheating. If the e fans only run when the engine gets warmed up, would they not run because the computer thinks it’s cold?
So do you think it’s just a weird coincidence that I have a code for the temp sensor if it’s just the gauge that’s bad? The code doesn’t indicate that the sensor is malfunctioning, just something about the circuit is out of range. Thanks again
You’re right. I apologize. I thought I mentioned that when I said I had codes for everything else. That’s why I said “additionally”. I guess I missed that.
That being said, I’m going to replace the sensor anyway and see if it makes a difference. I got a new acdelco one for ~$12 online so I’ll see if that makes a difference