P0515 Battery Temperature Sensor Circuit

The battery temperature sensor – usually an NTC in the battery tray or inside an intelligent battery sensor on the negative terminal – lets the module adjust the charging voltage (higher when cold, lower when warm) and supports battery management and start-stop. P0515 is its general circuit fault – open or short – without separating low and high; the charging voltage is then fixed or conservative. No manufacturer document available to us names this code; the description follows CARB's input component rules. A fixed substitute temperature is then used.

Likely causes

Symptoms

• Possibly check engine light
• Charging voltage not temperature-compensated
• Start-stop or battery management limited

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, en.wikipedia.org.