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. This can lead to improper battery charging, reduced battery life, and potential starting problems.
1. Most Common Causes
- Faulty battery temperature sensor (out of range)
- Short to voltage in the sensor wiring
- Open circuit in the sensor wiring or connector
- Corroded or poor connection at the sensor connector terminal
- Internal ECM failure
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Battery overcharging or undercharging
- Reduced battery life
- Hard starting or electrical issues
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P0517 and check for other codes.
Step 2: Visually inspect the battery temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor resistance at different temperatures and compare to specifications; replace if out of range.
Step 4: Check for short to power by disconnecting sensor and measuring voltage at harness; repair if voltage present.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as improper battery charging can lead to a dead battery or electrical system damage. Short trips to a repair shop are acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts (sensor $20-$50) and labor (0.5-1 hour).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.