Drive Motor Inverter Temperature Sensor Circuit Low
The P0BD8 code indicates that the powertrain control module (PCM) has detected a low voltage 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. A low circuit condition typically means the signal voltage is below the expected range, often due to a short to ground, open circuit, or faulty sensor. This can lead to inaccurate temperature readings, potentially causing the inverter to overheat or the vehicle to limit power to protect components.
01. Most Common Causes
- Faulty drive motor inverter temperature sensor
- Short to ground in the sensor circuit
- Open or damaged wiring/connectors
- Corrosion or poor electrical connections
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or performance
- Overheating of the inverter
- Vehicle may enter limp mode
- Inaccurate temperature gauge or warning messages
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the inverter temperature sensor and wiring for damage, corrosion, or loose connections.
Step 3: Use a multimeter to check sensor resistance and compare to manufacturer specifications.
Step 4: Check for voltage and ground at the sensor connector; if low, trace circuit for shorts or opens.
Step 5: If sensor and circuit are okay, test PCM output and consider PCM replacement if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a low circuit condition can cause inaccurate temperature readings, leading to inverter overheating or sudden power loss, which may be dangerous.
How much does it cost to fix?▼
Repair costs typically range from $50 to $150 for sensor replacement and basic wiring repairs, but can be higher if the PCM or inverter needs replacement.