P0A21 Fault Code

Motor Torque Sensor Circuit Intermittent

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0A21 fault code indicates that there is an intermittent issue within the Motor Torque Sensor Circuit. This sensor is critical as it measures the torque output from the electric motor and sends that information to the vehicle's control module. An intermittent fault can lead to erratic vehicle performance and may impact fuel efficiency or acceleration.

What are the symptoms of the P0A21 code?

Symptoms associated with the P0A21 code may include:

• Warning lights on the dashboard, such as the check engine light.
• Reduced engine power or acceleration issues.
• Unusual noises from the engine or electric motor during operation.
• Fluctuating engine RPMs.
• Vehicle stalling or poor throttle response during driving.

What causes the P0A21 code?

Several factors can contribute to the P0A21 fault code, including:

• Loose or damaged wiring in the motor torque sensor circuit.
• Faulty motor torque sensor that may not provide consistent readings.
• Poor connections due to corrosion or dirt.
• Issues with the vehicle’s powertrain control module affecting the sensor's performance.
• Temperature-related failures, especially in extreme conditions.

How to fix P0A21?

To resolve the P0A21 fault code, the following steps are recommended:

• Inspect the wiring and connectors related to the motor torque sensor for any signs of damage, corrosion, or loose connections.
• Test the motor torque sensor itself for proper functionality; replace it if it's faulty.
• Ensure that the powertrain control module is functioning correctly and is able to communicate accurately with the motor torque sensor.
• Clear the fault codes and conduct a road test to confirm that the issue is resolved and the code does not reappear.