AutoCodes – GMC – P0073 GMC

P0073 GMC Code - Ambient Air Temperature Sensor Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. Common causes include Faulty Ambient Air Temperature Sensor, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor circuit poor electrical connection. 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, Ambient Air Temperature Sensor harness is open or shorted, Ambient Air Temperature Sensor circuit poor electrical connection.
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.

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Code Popularity 2,303

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0073 GMC Description

The Engine Control Module (ECM) monitors the ambient air temperature sensor with a low reference circuit and signal circuit. The ECM monitors the voltage drop across the sensor, which is inversely proportional to temperature. When the ambient air temperature is cold, the resistance of the sensor is high. When the ambient air temperature is warm, the resistance of the sensors is low. The engine control module converts the voltage value to a temperature value and sends the value to the Display Module via serial data. The Display Module displays the temperature. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the Ambient Air Temperature Sensor signal is less than -40°C (-40°F).

OBDII Code P0073 GMC - Ambient Air Temperature Sensor Circuit High Voltage - AutoCodes.com — P0073 GMC Code - Ambient Air Temperature Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0073 GMC?

Faulty Ambient Air Temperature Sensor
Ambient Air Temperature Sensor harness is open or shorted
Ambient Air Temperature Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0073 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0073 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0073 GMC code?

Need more information on how to fix the P0073 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0073 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0073 2014 GMC Sierra — Ambient Air Temperature Sensor Circuit High Voltage
P0073 2015 GMC Sierra — Ambient Air Temperature Sensor Circuit High Voltage
P0073 2016 GMC Sierra — Ambient Air Temperature Sensor Circuit High Voltage
P0073 2017 GMC Sierra — Ambient Air Temperature Sensor Circuit High Voltage
P0073 2018 GMC Sierra — Ambient Air Temperature Sensor Circuit High Voltage

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.