Battery Temperature Sensor Circuit Low Voltage
The P0516 code indicates that the Engine Control Module (ECM) has detected a voltage signal from the battery temperature sensor that is lower than the expected range. This sensor monitors battery temperature to adjust charging voltage. A low voltage reading typically points to a short circuit, faulty sensor, or wiring issue. The ECM may compensate by altering charging rates, potentially leading to battery overcharging or undercharging.
01. Most Common Causes
- Faulty battery temperature sensor
- Short circuit in sensor wiring or connector
- Corroded or damaged sensor connector
- ECM software or hardware issue (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Battery may overheat or fail to charge properly
- Possible reduced battery life or starting issues
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P0516 and check for other related codes.
Step 2: Visually inspect the battery temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor resistance with a multimeter; compare to manufacturer specifications (typically 2-10 kΩ at room temperature).
Step 4: Check for short to ground or open circuit in the sensor signal wire.
Step 5: If sensor and wiring are okay, test ECM input voltage and consider ECM reprogramming or replacement.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but prolonged driving may cause battery damage or charging system issues. It's best to diagnose and repair promptly.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150, including parts (sensor $20-$50) and labor (0.5-1 hour).