Battery Temperature Sensor Circuit Malfunction
The P0515 code indicates a problem in the battery temperature sensor circuit. This sensor monitors battery temperature to optimize charging voltage. A faulty sensor, wiring issues, or a bad PCM can cause incorrect battery charging, leading to overcharging or undercharging.
01. Most Common Causes
- Faulty battery temperature sensor
- Open or shorted wiring in sensor circuit
- Corroded or loose connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Battery not charging properly
- Reduced fuel economy
- Electrical issues (dim lights, slow cranking)
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect battery temperature sensor and wiring for damage.
Step 3: Test sensor resistance with a multimeter (compare to specs).
Step 4: Check for voltage and ground at sensor connector.
Step 5: If sensor and wiring are OK, test PCM output or replace PCM.
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 electrical issues. It's best to diagnose and fix promptly.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on sensor location and labor rates.