What Does P0516 Mean?
The battery temperature sensor circuit is producing a voltage reading below the expected minimum threshold. For a typical NTC (negative temperature coefficient) thermistor, a low voltage reading corresponds to the PCM interpreting an excessively high battery temperature. The PCM may reduce charging voltage to protect the battery, which could lead to undercharging. The driver may notice reduced charging system output or a battery warning indicator.
Common Causes
30%
Short to ground in the battery temperature sensor wiring
30%
Failed battery temperature sensor with internally shorted element
20%
Corroded connector causing low-resistance path to ground
12%
Acid damage to wiring near the battery creating a conductive path
8%
Incorrect sensor installed with wrong resistance characteristics
Diagnostic Steps
1
Monitor the battery temperature sensor PID — if it reads an unreasonably high temperature (e.g., 200°F+) when the battery is at ambient, the signal is being pulled low.
2
Disconnect the sensor and check the voltage on the PCM-side connector — if the voltage jumps to the reference voltage (typically 5V), the problem is in the sensor or its wiring.
3
With the sensor disconnected, check for continuity between the signal wire and ground — any continuity indicates a short to ground in the harness.
4
Measure the sensor resistance and compare to the temperature/resistance chart — a very low resistance at ambient temperature confirms a shorted sensor.
5
Inspect the wiring near the battery tray for acid corrosion that may be eating through the insulation and creating a ground fault.
Estimated Repair Cost
$20 - $150
Parts + labor, varies by vehicle and location
The battery temperature sensor circuit is producing a voltage reading below the expected minimum threshold. For a typical NTC (negative temperature coefficient) thermistor, a low voltage reading corresponds to the PCM interpreting an excessively high battery temperature. The PCM may reduce charging ...
The most common cause of P0516 (Battery Temperature Sensor Circuit Low) is: Short to ground in the battery temperature sensor wiring
Typical repair costs for P0516 range from $20 to $150, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive short term. The PCM may reduce charging voltage, which could lead to a gradually depleting battery. Monitor battery voltage and avoid long trips with heavy electrical loads until repaired. The battery may not fully recharge, leading to potential starting difficulty.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0516 to identify the root cause.
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Quick Info
Category
Powertrain
System
Charging System
Difficulty
Type
Generic (SAE)
Recommended Tools
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