What causes fault code P0517?

• Most likely: Faulty battery temperature sensor (internal open circuit) • Likely: Open circuit/wiring break or corrosion in the sensor connector • Possible: Defective battery monitoring sensor (BMS) module integration • Rare: Internal PCM failure

How do you fix fault code P0517?

STEP 1: Visually inspect battery terminals and the sensor (usually located on or below the battery tray). Clean any corroded connectors. STEP 2: Measure reference voltage at the sensor connector (should be 5V with ignition ON). Check for a solid ground. STEP 3: Measure sensor resistance (Ohms). At 68°F (20°C), resistance is typically 10k-15k Ohms (check OEM specs). Infinite resistance (OL) confirms a failed sensor. STEP 4: If wiring and sensor are intact, perform a functional test of the battery management system via a scan tool to rule out PCM issues.

Powertrain (Engine & Gearbox)Standard EOBD

P0517 - Battery Temperature Sensor Circuit High

Q: What are the symptoms of fault code P0517?

• Check engine light on (MIL) • Battery warning light may be illuminated or flashing • Improper charging voltage (often defaults to a high fixed value, e.g., 15V+) • Reduced battery longevity due to incorrect charging profiles

Last updated:1 February 2026

Related:Battery, BMS (Battery Management System), Alternator, PCM/ECM, Wiring Harness

System

Powertrain (Engine & Gearbox)

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Technical Description

P0517 is a generic diagnostic trouble code (DTC) indicating that the Engine Control Module (ECM/PCM) has detected a voltage from the battery temperature sensor that exceeds the calibrated limit (typically above 4.8V). The sensor is an NTC (Negative Temperature Coefficient) thermistor, meaning resistance decreases as temperature increases. A 'Circuit High' condition usually signifies an open circuit or high resistance in the sensor or wiring, causing the PCM to see maximum reference voltage, interpreted as an out-of-range cold temperature. The PCM uses this data to manage the alternator's charging rate to prevent battery overcharging or undercharging.

Possible Causes

Faulty battery temperature sensor (internal open circuit)

Open circuit/wiring break or corrosion in the sensor connector

Defective battery monitoring sensor (BMS) module integration

Internal PCM failure

Symptoms

Check engine light on (MIL)

Battery warning light may be illuminated or flashing

Improper charging voltage (often defaults to a high fixed value, e.g., 15V+)

Reduced battery longevity due to incorrect charging profiles

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P0517 - Battery Temperature Sensor Circuit High

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P0517 - Battery Temperature Sensor Circuit High

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