Drive Motor Inverter Temp Sensor Circuit Intermittent
The P0BD5 code indicates an intermittent or erratic signal from the drive motor inverter temperature sensor circuit. This sensor monitors the temperature of the inverter, which converts DC battery power to AC for the electric drive motor. An intermittent fault can cause the powertrain control module (PCM) to receive unreliable temperature readings, potentially leading to reduced motor performance, unexpected shutdowns, or activation of limp mode to protect the inverter from overheating.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or performance
- Vehicle enters limp mode
- Inverter overheating warnings
2. Most Common Causes
- Faulty inverter temperature sensor 'C' (internal drift, intermittent open/short circuit)
- Damaged, corroded, loose, or high-resistance wiring or connectors in the sensor circuit
- Intermittent short to voltage or ground in the sensor harness
- Internal failure of the inverter control module / hybrid PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the inverter temperature sensor and its wiring/connector for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check sensor resistance and compare to manufacturer specs; also check for continuity and shorts in the circuit.
Step 4: If wiring is intact, replace the temperature sensor and clear codes; test drive to verify repair.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The intermittent sensor can cause sudden power loss or inverter damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic fees if needed.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.