Hybrid Battery Temp Sensor Circuit Intermittent/Erratic
The P0ACE code indicates an intermittent or erratic signal from the hybrid battery temperature sensor circuit. This sensor monitors the temperature of the high-voltage hybrid battery pack to prevent overheating and optimize performance. An intermittent fault may cause the hybrid system to reduce power or shut down to protect the battery.
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 (rare)
02. Symptoms You Will Notice
- Check hybrid system warning light on
- Reduced hybrid system performance or power
- Hybrid system may shut down intermittently
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the hybrid battery temperature sensor and its wiring for damage or corrosion.
Step 3: Use a multimeter to check sensor resistance and compare to specifications.
Step 4: Check for intermittent connection by wiggling harness while monitoring sensor signal.
Step 5: If sensor and wiring are OK, test the hybrid battery control module for faults.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The hybrid system may reduce power or shut down unexpectedly, potentially causing a loss of propulsion. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but costs can vary if the sensor or module needs replacement.