P1492 Ambient/ Battery Temp sensor input voltage too high

 

Most likely the plastic battery temp sensor on the front side of the battery box is cracked and busted giving you the error code and (hopefully) the red light on the dash for charging should also be lit giving you a "helpful warning".

If the sensor is reading a voltage problem, the PCM will reduce the level of charging that the alternator can put out. Basically, the PCM tells the alternator to chill out and work less hard. This then helps keep the battery from getting overcharged and too hot and possibly going boom.

In reality, the sensor is a Censored sensor that creates more Censored problems then it fixes. If you never fix it, you will most likely be just fine. However, you will have to stare at that frakkin' red light for eternity. The part costs about 10 bucks, and be very careful putting it on, because if you tighten that frakkin' nut just one turn too much, you WILL crack and break it and have to do this all over again. I know from personal aggravation on this account......Just get it snug BY HAND, connect the plug and forget about it.

 

can someobe tell me exactly where the battery temp sensor is? what it loks like and what it connects to? Ido not have that battery thermal cover on battery. codes read voltage to high.

 

It connects to the from lower bottom part of the battery tray.

 

hi thanks but I can not understand your post. there are words missing. and can you be a little more specific as to the location and where the wires go to, thank you again for your help

 

pop off the battery top cover, remove battery. it is the little black dome looking thing about the sixe of a dime in the front part of the bottome of the battery tray next to the ribbed drain/cooling hose. I would check the wireing to the sensor before replacing it. I just took the bulb out of my old car and forgot about it. never had an issue in the 7 years I owned it.

 

i will look for it tomorrow. if i disconnect the battery will i be doing any type of damage to anything, and would that sensor make the check engine light come on. mine came on along with the battery symbol. The battery light was on when i got the car a few days ago. i drove it for about 60 miles and the check engine light came on says PO517 putting out a higher than normal voltage. thanks for our quick reply