What Does P0515 Mean?
The battery temperature sensor circuit has a general malfunction. The PCM or body control module has detected an electrical fault in the battery temperature sensor circuit that prevents it from obtaining a valid temperature reading. This affects the alternator's ability to regulate charging voltage based on temperature conditions. The driver may notice the battery warning light or charging system light on the dashboard.
Common Causes
35%
Failed battery temperature sensor with open or shorted internal element
25%
Open circuit in the battery temperature sensor wiring
20%
Corroded sensor connector due to proximity to battery acid
12%
Sensor disconnected or wire broken during battery replacement
8%
PCM or BCM input circuit failure for the temperature sensor
Diagnostic Steps
1
Verify the battery temperature sensor is physically connected — this sensor is commonly dislodged or disconnected during battery replacement.
2
Check for voltage reference and ground at the sensor connector with the ignition on — typically 5V reference and ground should be present.
3
Measure the sensor resistance and compare to the manufacturer's specification. An open reading (infinite ohms) or a dead short (0 ohms) confirms sensor failure.
4
Inspect the wiring from the sensor to the PCM/BCM for breaks, corrosion, or acid damage, particularly near the battery tray area.
5
If the sensor and wiring check out, use the scan tool to verify the PCM is receiving the signal — check for a stored default temperature value that indicates the PCM is using a fallback.
Estimated Repair Cost
$20 - $150
Parts + labor, varies by vehicle and location
The battery temperature sensor circuit has a general malfunction. The PCM or body control module has detected an electrical fault in the battery temperature sensor circuit that prevents it from obtaining a valid temperature reading. This affects the alternator's ability to regulate charging voltage ...
The most common cause of P0515 (Battery Temperature Sensor Circuit) is: Failed battery temperature sensor with open or shorted internal element
Typical repair costs for P0515 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. The PCM will use a default temperature value for charging regulation, which is acceptable for short-term driving. Prolonged operation may result in suboptimal battery charging, particularly in extreme hot or cold temperatures. Repair before extreme weather conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0515 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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