P0514Generic code

P0514 Code: Battery Temperature Sensor Circuit Range/Performance

The P0514 code means the battery temperature sensor is giving a reading that is electrically valid but does not match what the computer expects. The main effect is less precise battery charging. The sensor, the connector and the wiring fail about equally often, so test before you buy parts.

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 P0514 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 range or performance fault, which is what the P0514 code reports, means the sensor is reading but reading wrong, or that there is a real abnormal condition at the battery.

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.

This kind of fault rarely shows up with a multimeter, because everything looks electrically correct. You have to compare what the part says against reality: with a gauge, a thermometer, a tachometer, or by commanding the component with the scan tool and seeing whether the physical result matches the command.

P0514 code symptoms

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

Likely causes of the P0514 code

  1. Degraded or out-of-calibration sensor. It gives believable readings that are wrong.
  2. A real abnormal condition. The system really is running outside normal.
  3. High resistance in the connector. Corrosion shifts the reading.
  4. Damaged or blocked port, hose or reluctor wheel, depending on the type of sensor.

How to diagnose the P0514 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 P0514 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 a fault there can mean replacing the terminal assembly.

P0514 on GM

Common on GM vehicles.

P0514 on Dodge

Common on Dodge vehicles.

P0514 on Chrysler

Common on Chrysler vehicles.

Frequently asked questions about P0514

What does the P0514 code mean?
It is a generic OBD2 code that means the battery temperature sensor gives a reading that is electrically valid but does not match what the computer expects. The result is less precise battery charging.
Can I drive with a P0514 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 P0514?
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 P0514 code clear itself?
Not reliably. If a corroded connector or a drifting sensor is behind it, the P0514 code comes back, so fix the cause instead of just clearing it.
What is the most common cause of P0514?
A degraded sensor or a corroded connector that shifts the reading. Because the sensor and the connection fail about equally often, test both before you buy a part.

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