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P code powertrain Medium severity

P0070 Ambient Air Temperature Sensor Circuit

The OBD2 code P0070 indicates a malfunction in the ambient air temperature sensor circuit, which measures the outside air temperature

Definition

The OBD2 code P0070 indicates a malfunction in the ambient air temperature sensor circuit, which measures the outside air temperature

Common causes

  • Faulty ambient air temperature sensor
  • Damaged wiring or connectors
  • Short circuit in the sensor circuit
  • Open circuit in the sensor circuit
  • Corrosion at the sensor connector
  • Faulty engine control module (ECM)

Common misdiagnoses

  • Faulty Engine Coolant Temperature Sensor
  • Faulty Intake Air Temperature Sensor
  • Malfunctioning Engine Control Module (ECM)
  • Wiring issues or shorts in the sensor circuit
  • Faulty Thermostat
  • Air conditioning system issues
  • Incorrectly calibrated temperature gauge or display
  • Faulty or blocked air intake system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the Ambient Air Temperature Sensor

    Locate the ambient air temperature sensor, which is usually mounted in the front grille or near the front bumper

  3. 3. Check for physical damage, corrosion, or loose connections at the sensor and its wiring harness

  4. 4. Test the Sensor

    Use a multimeter to measure the resistance of the ambient air temperature sensor. Compare the readings to the specifications provided in the vehicle's service manual

  5. 5. If the resistance is out of range, the sensor may be faulty and should be replaced

  6. 6. Check Wiring and Connectors

    Inspect the wiring and connectors leading to the ambient air temperature sensor for any signs of wear, fraying, or damage

  7. 7. Ensure that all connections are secure and free of corrosion

  8. 8. Test the Circuit

    With the ignition on (engine off), check for voltage at the sensor connector. The voltage should match the specifications in the service manual

  9. 9. If there is no voltage, trace the wiring back to the ECU to identify any breaks or shorts in the circuit

  10. 10. Check for Ground Issues

    Ensure that the ambient air temperature sensor has a good ground connection. A poor ground can cause erratic readings or trigger the P0070 code

  11. 11. Inspect the ECU

    If all other components check out, there may be an issue with the ECU itself. This is less common but can happen. Check for any software updates or recalls related to the ECU

  12. 12. Clear the Code and Test Drive

    After performing repairs or replacements, clear the trouble code using the OBD-II scanner

  13. 13. Take the vehicle for a test drive to see if the code returns. Monitor the ambient air temperature readings to ensure they are accurate

  14. 14. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0070 code