What does Error Code P0073 mean?
Moderate Issue
DTC Code P0073 indicates a high voltage issue in the Ambient Air Temperature Sensor Circuit, detected by the Engine Control Module (ECM) when the sensor signal is less than -40°C (-40°F).
What are the symptoms of Error Code P0073?
- Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating a potential issue with the ambient air temperature sensor circuit.
- Inaccurate Temperature Readings: The vehicle's temperature display may show incorrect ambient air temperature readings, which can affect climate control and engine performance.
- Poor Fuel Efficiency: The engine control module may receive incorrect data, leading to suboptimal fuel mixture adjustments and reduced fuel efficiency.
What causes Error Code P0073?
- The ambient air temperature sensor may be malfunctioning, leading to incorrect voltage readings.
- An open or shorted harness in the ambient air temperature sensor can disrupt the circuit, causing high voltage signals.
- Poor electrical connections in the sensor circuit can result in unstable voltage levels, triggering the error code.
- A defective Engine Control Module (ECM) might misinterpret sensor data, leading to erroneous high voltage readings.
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How to fix Error Code P0073?
- Verify DTC Code: Confirm the presence of DTC P0073 using an OBD-II scanner. Ensure no other related codes are active.
- Inspect Ambient Air Temperature Sensor: Locate the ambient air temperature sensor, typically found near the front bumper or grille. Check for physical damage or corrosion.
- Check Sensor Wiring and Connectors: Inspect the wiring and connectors for any signs of damage, corrosion, or disconnection. Ensure all connections are secure.
- Measure Sensor Voltage: Using a multimeter, measure the voltage at the sensor connector. A high voltage reading indicates a potential short to power or a faulty sensor.
- Test Sensor Resistance: Disconnect the sensor and measure its resistance. Compare the reading to the manufacturer's specifications to determine if the sensor is faulty.
- Inspect for Short Circuits: Check the wiring harness for any signs of a short circuit to power, which could cause high voltage readings.
- Replace Faulty Components: If the sensor or wiring is found to be faulty, replace the necessary components and clear the DTC code. Re-test to ensure the issue is resolved.