Battery Temperature Sensor Circuit High Voltage
The P0517 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the battery temperature sensor that is higher than the expected range. This sensor monitors battery temperature to optimize charging voltage. A high voltage reading typically points to a short circuit to power, a faulty sensor, or wiring issues. The ECM may adjust charging voltage incorrectly, leading to battery overcharging or undercharging.
01. Most Common Causes
- Shorted battery temperature sensor
- Wiring short to battery voltage or 5V reference
- Corroded or damaged connector
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Battery overcharging or undercharging
- Premature battery failure
- Possible no-start or hard start
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify P0517 and check freeze frame data.
Step 2: Visually inspect the battery temperature sensor and wiring for damage or corrosion.
Step 3: Disconnect the sensor and measure resistance; compare to spec (typically 2-10 kΩ at room temp).
Step 4: Check for voltage at the sensor connector (should be 5V reference). If voltage is high, repair short to power.
Step 5: If sensor and wiring are good, replace the sensor and clear codes.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as incorrect battery charging can lead to battery damage or electrical system issues. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The typical repair cost ranges from $50 to $150, including parts (sensor) and labor. Diagnostic fees may add $50-$100.