P0517
UniversalBattery Temperature Sensor Circuit High
Medium SeverityThis code indicates that the Powertrain Control Module (PCM) has detected a voltage signal from the battery temperature sensor that is higher than the specified range. This usually means the sensor circuit is open or shorted, potentially causing incorrect battery charging or even preventing the vehicle from starting.
⚠️ Before You Begin (Safety First)
Always wear appropriate personal protective equipment, including eye protection and gloves, when working on a vehicle's electrical system. Disconnect the negative battery terminal before performing any repairs to prevent electrical shock or damage to the vehicle's electrical components. Batteries can contain corrosive acid and release explosive gases.
Common Symptoms
- Check Engine Light illuminated
- Poor battery charging
- Battery warning light on dashboard
- Engine starting issues
- Possible erratic electrical system behavior
Common Causes
- Faulty battery temperature sensor
- Corroded, damaged, or open wiring/connector in the sensor circuit
- Short to voltage in the sensor circuit
- Faulty Powertrain Control Module (PCM) (rare)
Frequently reported on: General/Universal
Diagnostic Steps
- Gather necessary tools (multimeter, basic hand tools, wiring diagram if available).
- Locate the battery temperature sensor, which is often attached to the battery tray, the battery itself, or integrated into the negative battery cable.
- Visually inspect the sensor and its wiring harness for any signs of damage, corrosion, or loose connections. Repair as necessary.
- Disconnect the sensor and use a multimeter to test the resistance of the sensor (if specified by a repair manual) and the voltage/ground at the connector. Refer to vehicle-specific repair data for expected values.
- If the sensor or wiring is confirmed faulty, replace the battery temperature sensor or repair the damaged wiring/connector.
- Clear the P0517 code using an OBD-II scanner and test drive the vehicle to ensure the repair is successful and the code does not return.
👨🔧 When to Call a Professional
If you have replaced the battery temperature sensor and verified all wiring connections, but the P0517 code persists, or if you suspect a problem with the PCM, it is best to consult with a professional automotive technician for further diagnosis.
Commonly Asked Questions
What does a P0517 code mean for my car battery?
A P0517 code indicates that your vehicle's computer is receiving a higher-than-expected voltage signal from the battery temperature sensor circuit. This usually points to an issue with the sensor or its wiring, which can affect how your battery charges.
Can I drive with a P0517 code?
While you might be able to drive, it's not recommended for long periods. An inaccurate battery temperature reading can lead to improper battery charging, potentially overcharging or undercharging the battery, which can shorten its lifespan or lead to starting issues.
Where is the battery temperature sensor located?
The location varies by vehicle, but it's commonly found either mounted directly to the battery, on the battery tray underneath the battery, or sometimes integrated into the negative battery cable terminal.
How do I test the battery temperature sensor?
You can typically test the sensor's resistance using a multimeter, comparing the readings to the specifications found in your vehicle's service manual. You may also test for proper voltage and ground at the sensor's connector.
Is it difficult to replace a battery temperature sensor?
For most vehicles, replacing the battery temperature sensor is a relatively straightforward DIY task, often rated as 'Easy' to 'Medium' in difficulty, especially if it's easily accessible on or near the battery.