Hybrid Battery Temp Sensor Circuit Intermittent
The P0C85 code indicates an intermittent or erratic signal from the hybrid battery temperature sensor circuit. This sensor monitors the temperature of the high-voltage battery pack to prevent overheating. An intermittent fault may be caused by loose connections, damaged wiring, or a failing sensor, leading to inaccurate temperature readings and potential battery performance issues.
01. Most Common Causes
- Loose or corroded connector at the battery temperature sensor
- Damaged wiring or short circuit in the sensor circuit
- Faulty hybrid battery temperature sensor
- Intermittent issue in the hybrid battery control module
02. Symptoms You Will Notice
- Check Engine Light or Hybrid System Warning Light on
- Reduced hybrid system performance or power
- Possible battery overheating or thermal management system activation
- Intermittent loss of electric power assist
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all stored codes and freeze frame data.
Step 2: Visually inspect the battery temperature sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Check the sensor resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Perform a wiggle test on the wiring harness while monitoring sensor data to identify intermittent faults.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to battery overheating or reduced performance. Have it diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause and labor rates.