Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P0517 Battery Temperature Sensor Circuit High

Check engine lightOn
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

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. P0517 means the signal voltage is above its limit, close to the reference; with an NTC that means very cold, or more often an open circuit – sensor unplugged, wire broken – or a short to positive. The module then assumes a cold battery and may charge too high. 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

Sensor unplugged or forgotten after a battery change
Wire or connector open or corroded
Sensor open internally
Signal line shorted to positive

Symptoms

  • Possibly check engine light
  • Charging voltage too high
  • Battery gassing or overcharged

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–150
Time0.3–1 h

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

Parts involved

battery temperature sensorsensor wiringengine control module

Related codes

P0514P0515P0516P0563

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