P0073 Technical Description
Ambient Air Temperature Sensor Circuit High
If you’re seeing the P0073 code, this guide will help you understand its meaning, symptoms, causes, and fixes. You’re likely reading this because your car’s throwing the P0073 trouble code.
I’ve tackled this code countless times. Trust me, I’ve seen it all.
We’ll discuss what the P0073 code indicates, the signs your vehicle may show, possible causes, and the best ways to address it.
Alright, let’s get started.
Key Takeaways
- The P0073 code indicates a high voltage issue with the ambient air temperature sensor circuit.
- Common symptoms include the check engine light, inaccurate temperature readings, and air conditioning issues.
- Possible causes are a faulty sensor, damaged wiring, or loose connections.
- Diagnose by inspecting the sensor, wiring, and connectors, and using a multimeter for testing.
- Fix the issue by repairing or replacing faulty components and clearing the code.
- Regular maintenance and prompt repairs can prevent recurring issues with the P0073 code.
Table of ContentsShow
What Does P0073 Trouble Code Mean?
The P0073 trouble code means there’s an issue with the ambient air temperature (AAT) sensor circuit.
Specifically, it indicates that the sensor’s voltage is too high, which the vehicle’s computer (ECM) interprets as an unusually high temperature.
This sensor is crucial because it helps the ECM manage various systems, including the air conditioning and engine cooling.
When the ECM detects a high voltage signal from the AAT sensor, it triggers the P0073 code. This high voltage usually means the sensor is reporting temperatures that are not realistic, often well above normal ambient conditions.
The ECM relies on accurate temperature readings to adjust engine and cabin functions. An incorrect reading can throw off these adjustments, leading to potential issues with performance and comfort.
Several factors can cause this trouble code. The AAT sensor might be faulty, or there could be issues with the wiring or connections in the sensor circuit.
Corrosion, damage, or a loose connection can lead to high resistance, resulting in the high voltage signal.
In some cases, the problem could stem from the ECM itself, though this is less common. If the ECM has an internal fault, it may incorrectly process the sensor’s data, triggering the P0073 code.
Understanding what the P0073 code means is the first step in diagnosing and fixing the problem.
By pinpointing whether the issue lies with the sensor, wiring, or ECM, you can take the necessary steps to resolve it and ensure your vehicle runs smoothly.
P0073 Trouble Code Symptoms
Here are the common symptoms you might notice when your vehicle has the P0073 trouble code:
- Check Engine Light is on
- Inaccurate outside temperature readings on the dashboard
- Problems with air conditioning performance
- Potential issues with engine cooling efficiency
- Intermittent or fluctuating temperature readings
P0073 Trouble Code Causes
Here are the typical causes of the P0073 trouble code:
- Faulty ambient air temperature sensor
- Damaged or corroded wiring or connectors in the sensor circuit
- Loose or poor electrical connections
- Short or open circuits in the sensor wiring
- Faulty ECM (rare)
How To Fix A P0073 Trouble Code
To fix the P0073 trouble code, follow these steps to diagnose and repair the issue:
1. Check for Other Codes
Use an OBD-II scanner to see if there are other related codes. Multiple codes can help pinpoint the exact issue.
2. Inspect the Ambient Air Temperature Sensor
Locate the AAT sensor, usually found near the front bumper or grille. Check for visible damage, dirt, or debris that could affect its readings. Clean the sensor if it’s dirty.
3. Examine the Wiring and Connectors
Inspect the wiring and connectors leading to the sensor. Look for signs of wear, corrosion, or damage. Repair or replace any damaged wires or connectors.
4. Test the Sensor
Use a multimeter to check the sensor’s resistance. Compare your readings with the manufacturer’s specifications. If the readings are out of range, replace the sensor.
5. Check for Short Circuits
Inspect the wiring for any short circuits or open circuits. Use a wiring diagram to trace the circuit and ensure continuity. Repair any faults you find.
6. Inspect the ECM
Although rare, the ECM could be faulty. If all other components are functioning correctly, consider testing or replacing the ECM.
7. Clear the Code
After making any repairs, clear the trouble code with your OBD-II scanner. Drive the vehicle to see if the code reappears. If the code returns, further diagnosis may be needed.
By following these steps, you can accurately diagnose and fix the P0073 trouble code, ensuring your vehicle’s systems function properly.
Conclusion
Now you know what the P0073 trouble code means and how to fix it.
Have you ever dealt with a faulty ambient air temperature sensor?
Comment below with your experiences or questions about fixing this issue!
