p0071 ambient air temperature sensor performance
P0071 Ambient Air Temperature Sensor Performance
Definition: The P0071 code indicates that the Powertrain Control Module (PCM) has detected a problem with the ambient air temperature sensor’s performance. This sensor measures the outside air temperature and sends this information to the PCM, which uses it for various engine control functions.
P0071 – Ambient Air Temperature Sensor Performance
Typical Severity: Moderate
Common Causes
P0071 – Ambient Air Temperature Sensor Performance
Common Causes:
- Faulty ambient air temperature sensor
- Open or short circuit in the ambient air temperature sensor wiring
- Corroded or poor electrical connection at the ambient air temperature sensor
- Defective engine control module (ECM)
Common Misdiagnosis
OBD2 Code: P0071
Description: Ambient Air Temperature Sensor Performance
Common Misdiagnosis: Replacing the ambient air temperature sensor without checking for wiring issues or poor electrical connections.
Common Diagnostic Steps
OBD2 Code: P0071
Description: Ambient Air Temperature Sensor Performance
- Verify the ambient air temperature reading on the scan tool and compare it to the actual outside temperature.
- Inspect the ambient air temperature sensor for physical damage or corrosion.
- Check the wiring harness and connectors for signs of wear, damage, or disconnection.
- Test the sensor’s resistance with a multimeter to ensure it is within manufacturer specifications.
- If applicable, check for any software updates related to this sensor from the vehicle manufacturer.
- Clear any fault codes and perform a test drive to see if the code returns.