Hybrid Battery Temperature Sensor Correlation Failure
The P0C87 code indicates that the hybrid battery temperature sensors are reporting inconsistent readings, suggesting a correlation fault. This typically occurs when one or more sensors within the battery pack provide data that deviates from expected patterns, often due to sensor degradation, wiring issues, or internal battery problems. The hybrid control module monitors these sensors to ensure safe battery operation and charging; a correlation error can lead to reduced hybrid system performance or shutdown.
01. Most Common Causes
- Faulty hybrid battery temperature sensor
- Damaged wiring or connector to the sensor
- Corrosion or poor electrical connection
- Internal hybrid battery module failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced fuel economy
- Hybrid system warning message on dashboard
- Possible loss of hybrid assist or vehicle entering limp mode
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve all codes and freeze frame data.
Step 2: Inspect the hybrid battery temperature sensor wiring and connectors for damage or corrosion.
Step 3: Compare live data from all temperature sensors to identify the outlier.
Step 4: Test the suspect sensor's resistance and compare to manufacturer specifications.
Step 5: If wiring and sensor are okay, perform a hybrid battery capacity test to check for internal failure.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a battery temperature sensor correlation fault can lead to improper battery charging or overheating, potentially causing damage or safety risks. Have the vehicle inspected promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether a sensor replacement or wiring repair is needed. If the hybrid battery module requires replacement, costs can be significantly higher.