What Does P0514 Mean?
The battery temperature sensor is providing readings that are outside the expected range or are not consistent with other temperature inputs and operating conditions. The PCM or charging system module uses this sensor to adjust the alternator charging voltage based on battery temperature — cold batteries need higher charging voltage, warm batteries need less. The driver may not notice symptoms immediately, but improper charging can lead to battery overcharge or undercharge over time.
Common Causes
35%
Faulty battery temperature sensor with erratic or out-of-range output
25%
Corroded or damaged connector at the battery temperature sensor
20%
Sensor displaced from the battery, reading ambient instead of battery temperature
12%
Wiring fault causing resistance or voltage drop in the sensor circuit
8%
Battery replaced with wrong group size, dislodging the temperature sensor
Diagnostic Steps
1
Monitor the battery temperature sensor PID after the vehicle has sat overnight — the reading should be close to ambient temperature (within 5-10°F). Compare to the intake air temperature sensor reading.
2
Locate the battery temperature sensor (usually attached to the battery tray, negative cable, or battery itself) and verify it is securely mounted and in contact with the battery.
3
Disconnect the sensor and measure its resistance — compare to the manufacturer's resistance-vs-temperature chart. At 77°F (25°C), a typical NTC thermistor reads approximately 10k ohms.
4
Check the sensor connector for corrosion, especially acid damage from battery off-gassing. Clean and treat with dielectric grease.
5
Monitor the charging system voltage — it should vary between approximately 13.5-15.0V depending on temperature and load. A fixed voltage regardless of temperature suggests the PCM is ignoring the sensor due to this fault.
Estimated Repair Cost
$20 - $150
Parts + labor, varies by vehicle and location
The battery temperature sensor is providing readings that are outside the expected range or are not consistent with other temperature inputs and operating conditions. The PCM or charging system module uses this sensor to adjust the alternator charging voltage based on battery temperature — cold batt...
The most common cause of P0514 (Battery Temperature Sensor Circuit Range/Performance) is: Faulty battery temperature sensor with erratic or out-of-range output
Typical repair costs for P0514 range from $20 to $150, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive. However, improper charging voltage regulation may shorten battery life or, in extreme cases, cause the battery to overcharge and vent electrolyte. Long-term driving without repair can lead to premature battery failure and being stranded.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0514 to identify the root cause.
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Quick Info
Category
Powertrain
System
Charging System
Difficulty
Type
Generic (SAE)
Recommended Tools
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