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Engine-Codes – GMC – P0073 GMC

P0073 GMC Code - Ambient Air Temperature Sensor Circuit High Voltage

Quick Answer

The P0073 diagnostic trouble code (DTC) for GMC vehicles indicates an issue with the ambient air temperature sensor circuit registering a high voltage. Common causes include Faulty Ambient Air Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect voltage signals to the ECM, Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECM could lead to high voltage readings, ECM Malfunction: A malfunctioning engine control module could misinterpret the sensor readings and trigger the high voltage code. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0073 GMC indicates Ambient Air Temperature Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Ambient Air Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect voltage signals to the ECM, Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECM could lead to high voltage readings, ECM Malfunction: A malfunctioning engine control module could misinterpret the sensor readings and trigger the high voltage code.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 19, 2024
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Code P0073 GMC Description

The P0073 diagnostic trouble code (DTC) for GMC vehicles indicates an issue with the ambient air temperature sensor circuit registering a high voltage. The ambient air temperature sensor is responsible for measuring the outside air temperature and sending this information to the engine control module (ECM). This data is crucial for the engine to adjust fuel mixture, ignition timing, and other parameters to optimize performance and fuel efficiency.

OBDII Code P0073 GMC - Ambient Air Temperature Sensor Circuit High Voltage
P0073 GMC Code - Ambient Air Temperature Sensor Circuit High Voltage

Common Causes of P0073 GMC

  1. Faulty Ambient Air Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect voltage signals to the ECM.
  2. Wiring Issues: Damaged or corroded wiring connecting the sensor to the ECM could lead to high voltage readings.
  3. ECM Malfunction: A malfunctioning engine control module could misinterpret the sensor readings and trigger the high voltage code.
  4. Environmental Factors: Extreme temperatures or exposure to moisture can sometimes cause sensor malfunctions.

Symptoms of P0073 GMC

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Inaccurate Temperature Reading: The ambient air temperature display on the vehicle's dashboard may show an incorrect reading.
  3. Poor Fuel Efficiency: The vehicle may experience decreased fuel efficiency due to incorrect adjustments made by the ECM based on the faulty temperature reading.
  4. Rough Idling: The engine may idle roughly or inconsistently as a result of the incorrect sensor readings.

How to Fix P0073 GMC

  1. Diagnostic Testing: Use a scan tool to read and clear the trouble codes, and perform diagnostic tests to identify the root cause of the high voltage reading.
  2. Inspect and Replace Sensor: Check the ambient air temperature sensor for proper operation and replace it if necessary.
  3. Check Wiring: Inspect the wiring harness for any damage or corrosion, and repair or replace as needed.
  4. ECM Inspection: Check the engine control module for any signs of malfunction and replace if necessary.
  5. Clear Codes and Test Drive: After completing the repairs, clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0073 GMC

The cost of repairing a P0073 code on a GMC vehicle can vary depending on the specific cause of the issue. In general, replacing the ambient air temperature sensor can cost between $50 and $150, while labor costs typically range from $80 to $150 per hour. If additional repairs are needed, such as wiring repairs or ECM replacement, the total cost could increase. It's recommended to consult with a trusted mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of your vehicle.

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Information for Specific GMC Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0073 GMC Code

1. What are the common symptoms of OBDII code P0073 GMC (Ambient Air Temperature Sensor Circuit High Voltage)?

The common symptoms include inaccurate temperature readings on the vehicle's display, incorrect climate control operation, and potential issues with engine performance.

2. What can cause the OBDII code P0073 GMC to trigger?

The code P0073 is typically triggered by a faulty ambient air temperature sensor, damaged wiring or connectors, or issues with the sensor's circuit.

3. How serious is the OBDII code P0073 GMC?

While the code itself may not directly impact the vehicle's drivability, it can lead to inconvenience due to inaccurate temperature readings and climate control operation. It is recommended to address the issue promptly.

4. How can I diagnose the cause of OBDII code P0073 GMC?

Diagnosing the code involves checking the ambient air temperature sensor, inspecting the wiring and connectors for damage, and testing the sensor's circuit for proper voltage and resistance.

5. Can I repair the OBDII code P0073 GMC on my own?

Depending on your automotive knowledge and skills, you may be able to repair the issue yourself by replacing the ambient air temperature sensor, repairing damaged wiring, or fixing faulty connectors.

6. Will driving with the OBDII code P0073 GMC cause any further damage to my vehicle?

Continuing to drive with the code may result in inaccurate temperature readings and potential issues with the climate control system. It is advisable to address the issue to prevent any further complications.

7. How much does it cost to fix the OBDII code P0073 GMC?

The cost of fixing the code can vary based on the cause of the issue, the price of replacement parts, and labor charges. It is recommended to obtain quotes from automotive professionals for an accurate estimate.

8. Can resetting the OBDII code P0073 GMC make it go away permanently?

Resetting the code without addressing the underlying issue will not make it go away permanently. The root cause of the problem needs to be identified and resolved for a lasting fix.

9. Are there any preventive measures to avoid OBDII code P0073 GMC in the future?

Regular maintenance checks, ensuring proper wiring connections, and timely replacement of sensors can help prevent the recurrence of the code P0073 related to the ambient air temperature sensor.

10. Can a faulty ambient air temperature sensor affect other systems in the vehicle?

Yes, a faulty ambient air temperature sensor can impact the climate control system, engine performance, and fuel efficiency, as it provides crucial data for these systems to function optimally.

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