Hybrid Battery Temperature Sensor Circuit Intermittent/Erratic
The P0C37 code indicates that the hybrid battery temperature sensor circuit is experiencing intermittent or erratic signals. This sensor monitors the temperature of the high-voltage hybrid battery pack to prevent overheating and ensure optimal performance. An intermittent fault can cause the hybrid system to reduce power or enter a fail-safe mode, potentially leading to reduced fuel economy or a no-start condition.
01. Most Common Causes
- Faulty hybrid battery temperature sensor
- Damaged or corroded wiring/connectors in the sensor circuit
- Intermittent short or open in the sensor circuit
- Failed hybrid battery control module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced hybrid system power or performance
- Hybrid system warning messages on dashboard
- Poor fuel economy
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 hybrid battery temperature sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor resistance and compare to manufacturer specifications; replace if out of range.
Step 4: Check for intermittent shorts or opens by wiggling the wiring harness while monitoring the sensor signal with a multimeter or scan tool.
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 cause the hybrid system to shut down or reduce power unexpectedly, potentially leading to a safety hazard.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether the sensor or wiring needs replacement.