P0517Generic code

P0517 Code: Battery Temperature Sensor Circuit High

The P0517 code means the battery temperature sensor signal is above its maximum value. The main effect is less precise battery charging. It usually points to an open circuit or a broken ground, and a loose connector is the most common cause.

Severity
Low
Can I keep driving?
Yes, no immediate risk
Estimated cost
$20 to $200
Difficulty
Medium
System
Computer and Outputs
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0517 code means

The computer adjusts the alternator charging voltage based on battery temperature: more voltage when it is cold and less when it is hot. Some vehicles measure that temperature with a dedicated sensor next to the battery or in the battery tray.

The sensor changes its resistance with temperature, and the computer reads the resulting voltage. A high signal, which is what the P0517 code reports, is usually caused by an open circuit or an interrupted ground.

Without this data, the computer charges the battery at a fixed safe voltage. Over time the battery can be overcharged in summer or undercharged in winter, and its life gets shorter.

To confirm it, measure the continuity of each wire between the component connector and the computer connector with the key off. It should be under 1 ohm. An infinite reading means the wire is open. If the wiring is good, measure the component itself: an infinite resistance confirms it is open inside.

P0517 code symptoms

  • Check engine light on.
  • Less precise battery charging.

Likely causes of the P0517 code

  1. Loose or broken connector. The most frequent cause.
  2. Signal or ground wire cut. The signal rises all the way up to the reference.
  3. Sensor open inside. Its resistance reads infinite.
  4. Short to 5 V or 12 V from rubbing against another wire in the harness.

How to diagnose the P0517 code step by step

  1. Read the sensor value on the scan tool and compare it with what you expect.
  2. Inspect the connector for corrosion, water or loose pins.
  3. Check the supply and ground with the key on: the reference should be correct, with less than 0.1 V of voltage drop on the ground.
  4. Measure the signal with the connector plugged in and watch whether it changes with the condition.
  5. Do a wiggle test on the harness with the scan tool in graph mode.
  6. Check the continuity of each wire to the computer (under 1 ohm).

How to fix the P0517 code

  • Repair the connector or the wiring.
  • Replace the sensor if the tests confirm it is bad.
  • Correct the real condition if there is one.
  • Clear the codes and verify with a road test.

Technical reference data

  • Two-wire NTC thermistor with a 5 V reference.
  • These values are a general guide: check the manufacturer data for your vehicle.

Brand-specific notes

On vehicles with an intelligent battery sensor (IBS), the temperature sensor is built into the negative battery terminal, so an open circuit there can mean replacing the terminal assembly.

P0517 on GM

Common on GM vehicles.

P0517 on Dodge

Common on Dodge vehicles.

P0517 on Chrysler

Common on Chrysler vehicles.

Frequently asked questions about P0517

What does the P0517 code mean?
It is a generic OBD2 code that means the battery temperature sensor signal is above its maximum value. In practice that points to an open circuit or an interrupted ground.
Can I drive with a P0517 code?
Yes, with some caution. The vehicle drives normally, but the charging voltage is less accurate, so keep an eye on the battery over time.
Do I have to replace the sensor?
Only if the tests confirm it. The connector and the wiring fail just as often.
What does the battery temperature sensor do?
The computer adjusts the alternator charging voltage based on battery temperature: more voltage when it is cold and less when it is hot. Some vehicles measure that temperature with a dedicated sensor next to the battery or in the battery tray.
How much does it cost to fix P0517?
As a rough guide, between $20 and $200. A connector repair is at the low end, and a new sensor with labor is at the high end.
Will a P0517 code clear itself?
Only if the open was momentary, such as a connector that wiggled back into place. A broken wire or a dead sensor will bring the P0517 code back.
What is the most common cause of P0517?
A loose or broken connector at the sensor. A cut signal or ground wire and a sensor that is open inside are the next most likely causes.

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