Damaged, chafed or corroded wiring to the motor temperature sensor, giving an open or short circuit; Poor connection or water ingress at the motor or inverter connector; Faulty drive motor temperature sensor (internal open, short or drift); Fault inside the inverter or motor control unit that reads the sensor; Genuine motor overheating from a cooling system problem, such as low coolant or a failed pump, causing an implausible or out-of-range reading; Outdated control unit software where the manufacturer has issued a correction for this code.

P0A2A

Drive Motor A Temperature Sensor A Circuit.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
A: AreaHybrid propulsion
2A: FaultThe specific fault in that area

What it means

P0A2A is the generic code for a fault in the Drive Motor 'A' temperature sensor 'A' circuit on a hybrid or electric vehicle. The control unit monitors the sensor's signal and has seen a reading or circuit condition outside the expected range, such as an open circuit, short circuit or implausible value. Exactly which motor and sensor is 'A', and whether the fault is flagged as high, low or performance, depends on the model.

Symptoms

Hybrid or EV system warning light or malfunction indicator lamp on
Reduced power or the car going into a limp-home mode
Electric motor assist limited or unavailable
Cooling fan or pump for the drive motor or inverter running constantly
Reduced regeneration or charging performance
Car refusing to enter ready mode in some cases

Possible causes

Damaged, chafed or corroded wiring to the motor temperature sensor, giving an open or short circuitlikely
Poor connection or water ingress at the motor or inverter connectorlikely
Faulty drive motor temperature sensor (internal open, short or drift)possible
Fault inside the inverter or motor control unit that reads the sensorpossible
Genuine motor overheating from a cooling system problem, such as low coolant or a failed pump, causing an implausible or out-of-range readingpossible
Outdated control unit software where the manufacturer has issued a correction for this coderare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting any related inverter, motor or cooling system codes
Check the live data for the motor temperature and compare it with the coolant or inverter temperatures when the car is cold; a cold motor should read close to ambient
Inspect the sensor wiring and connectors for chafing, heat damage, corrosion, moisture and pushed-back pins, following the manufacturer's high-voltage safety procedure
Wiggle test the harness with live data on screen to see whether the reading jumps or drops out
Check the drive motor and inverter coolant level, condition and pump and fan operation
With the system safely isolated by a suitably trained person, measure the sensor resistance and compare it with the manufacturer's specification at a known temperature
Check the wiring for continuity and for shorts to earth or supply between the sensor and the control unit
Check for applicable software updates or technical bulletins for the specific model

How to fix

Repair or replace damaged wiring and clean or replace faulty connectors
Replace the drive motor temperature sensor if its resistance is out of specification, as per the model's procedure
Restore the cooling system to correct operation by topping up, bleeding or replacing the pump or other faulty parts
Repair or replace the inverter or motor control unit if it is confirmed faulty
Apply a manufacturer software update if one is published for this fault
Clear the code and road test to confirm it does not return

Can I keep driving?

Medium severity

The car can usually be driven short distances, but expect reduced power and the risk of the motor being protected by limiting output. Have it checked soon, and stop if the temperature warnings appear or power drops sharply.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.