Battery Temperature Sensor Circuit High
The P0515 code means the vehicle's onboard diagnostic system has detected: Battery Temperature Sensor Circuit High. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $50 - $200 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Charging system voltage too low for conditions
- Battery may not fully charge
- Start/stop system disabled
Probable Causes (Ranked by Likelihood)
- Open circuit in battery temperature sensor wiring Very High
- Failed battery temperature sensor (reads high) High
- Corroded battery terminal affecting sensor signal Moderate
- Sensor disconnected from battery Moderate
Frequently Asked Questions
What does circuit high mean for battery temperature?
Circuit high for a battery temperature sensor typically means an open circuit, which the ECM reads as extremely high resistance. The ECM interprets this as very cold battery temperature and may reduce charging voltage when it should not.
Can this code disable the start/stop system?
Yes. Many vehicles with automatic start/stop systems require accurate battery temperature data to determine if the battery can handle repeated restarts. If the sensor reports incorrect data, the system is disabled as a precaution.
Is P0515 related to alternator problems?
Not directly. P0515 is a sensor circuit issue, not an alternator problem. However, the incorrect temperature data can cause the ECM to command improper alternator output, which may appear as a charging problem.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Check battery temperature sensor reading with a scan tool; an extremely high reading confirms the circuit issue
-
Inspect the sensor connector and wiring for open circuits or corrosion
-
Verify sensor is properly mounted and in contact with the battery surface
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Measure sensor resistance at the connector and compare to temperature chart in service manual
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Commonly Affected Vehicles
- 2008-2018 Ford Escape
- 2010-2020 Chevrolet Equinox
- 2009-2019 Honda Accord
- 2011-2020 Toyota RAV4
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