What Does P0BD5 Mean?
The drive motor inverter temperature sensor "C" circuit is exhibiting intermittent or erratic signal behavior. The reading fluctuates, drops out momentarily, or shows spikes that do not correspond to actual temperature changes. This makes the control module unable to reliably determine the thermal state of the inverter zone monitored by sensor C.
Common Causes
30%
Loose or partially backed-out connector pin on sensor C circuit
25%
Intermittent wire break within the insulation from vibration stress
20%
Corroded connector terminal making intermittent contact
15%
Failing NTC thermistor with intermittent internal connection
10%
EMI from high-power inverter switching coupling into the sensor signal
Diagnostic Steps
1
Monitor sensor C on the scan tool while performing a thorough wiggle test on the connector at both ends of the circuit.
2
Compare sensor C behavior to sensors A and B during a drive cycle — the intermittent spikes or dropouts will be obvious against the smooth readings of the other sensors.
3
Inspect the sensor C connector terminals for proper retention force, corrosion, and evidence of fretting wear.
4
Check the wiring harness for secure mounting and proper strain relief, particularly where it passes through the inverter housing.
5
If the erratic behavior correlates with high torque demand or high inverter current, investigate EMI shielding of the sensor wire and its routing relative to power cables.
6
If all wiring checks pass, replace the temperature sensor as internal thermistor connections can develop intermittent failures.
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The drive motor inverter temperature sensor "C" circuit is exhibiting intermittent or erratic signal behavior. The reading fluctuates, drops out momentarily, or shows spikes that do not correspond to actual temperature changes. This makes the control module unable to reliably determine the thermal s...
The most common cause of P0BD5 (Drive Motor Inverter Temperature Sensor "C" Circuit Intermittent/Erratic) is: Loose or partially backed-out connector pin on sensor C circuit
Typical repair costs for P0BD5 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent temperature data creates inconsistent thermal protection for the inverter. The control module may oscillate between normal and derated power modes, causing unpredictable torque availability. Brief unmonitored periods during high thermal demand could allow localized overheating of the IGBT modules.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0BD5 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Powertrain - Drive Motor Inverter
Difficulty
Type
Generic (SAE)
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