What Does P0A33 Mean?
The Drive Motor 'B' Temperature Sensor Circuit High code indicates the sensor signal voltage has exceeded the maximum acceptable threshold. With NTC thermistor sensors, a high voltage corresponds to very high resistance, which the controller interprets as an implausibly low or negative temperature reading. This is characteristic of an open circuit condition caused by a broken wire, disconnected sensor, or a sensor with an internally failed open element. The Motor B controller cannot determine actual motor temperature and will restrict operation.
Common Causes
30%
Open circuit in the temperature sensor signal wire between sensor and Motor B controller
25%
Disconnected or partially unseated Motor B temperature sensor connector
22%
Failed temperature sensor with internally open thermistor element
13%
Corroded connector terminals creating an open-circuit at the pin interface
10%
Motor B controller reference voltage circuit fault elevating the signal
Diagnostic Steps
1
Read the Motor B temperature on the scan tool; an implausibly low reading (e.g., -40 degrees C or below ambient) on a warm motor confirms the high-circuit/open condition.
2
Verify the Motor B temperature sensor connector is fully seated, locked, and not loosened by vibration; rear-mounted motor sensor connectors are especially prone to vibration-induced disconnection.
3
Disconnect the sensor and measure its resistance at ambient temperature; an infinite (OL) ohm reading confirms a failed open sensor element.
4
If sensor resistance is within specification, test wiring continuity from the sensor connector to the Motor B controller connector; check each wire individually for open conditions.
5
Inspect the harness at connectors, clip points, and where it crosses structural members for hidden conductor breaks within intact insulation jacket.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The Drive Motor 'B' Temperature Sensor Circuit High code indicates the sensor signal voltage has exceeded the maximum acceptable threshold. With NTC thermistor sensors, a high voltage corresponds to very high resistance, which the controller interprets as an implausibly low or negative temperature r...
The most common cause of P0A33 (Drive Motor "B" Temperature Sensor Circuit High) is: Open circuit in the temperature sensor signal wire between sensor and Motor B controller
Typical repair costs for P0A33 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of Motor B temperature feedback prevents the controller from protecting against overheating. Motor output will be restricted as a precaution. Continued driving without temperature monitoring risks eventual motor damage if the cooling system has an undetected issue.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A33 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Powertrain
Difficulty
Type
Generic (SAE)
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