Battery Temperature Sensor Circuit Range/Performance
Your car's battery temperature sensor isn't sending the right signal to the engine computer, like a thermometer giving wildly incorrect readings. The ECU can't properly manage charging and electrical systems without accurate temperature data.
The ECU monitors the battery temperature sensor's voltage output to adjust charging voltage and manage electrical load. The sensor resistance changes with temperature, producing a voltage signal the ECM compares against expected ranges. Out-of-range values trigger this fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Sensor Voltage | 0.5V - 4.5V proportional to temperature | Below 0.1V or above 4.9V, or erratic fluctuation |
| Temperature Range | -40°C to 125°C (-40°F to 257°F) | Readings outside expected vehicle operating range |
Code P0514 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0514 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.