AutoCodes – GMC – P0074 GMC

P0074 GMC Code - Ambient Air Temperature Sensor Circuit Intermittent

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: P0074 GMC indicates Ambient Air Temperature Sensor Circuit Intermittent.
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 456

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 P0074 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 an unrealistic signal variance of the Ambient Air Temperature Sensor signal.

OBDII Code P0074 GMC - Ambient Air Temperature Sensor Circuit Intermittent - AutoCodes.com — P0074 GMC Code - Ambient Air Temperature Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0074 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 P0074 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 P0074 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 P0074 GMC code?

Need more information on how to fix the P0074 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0074 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0074 2014 GMC Sierra — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2015 GMC Sierra — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2016 GMC Sierra — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2017 GMC Sierra — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2018 GMC Sierra — Ambient Air Temperature Sensor Circuit Intermittent

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 P0074 GMC Code

1. What are the common symptoms of OBDII code P0074 GMC related to the Ambient Air Temperature Sensor Circuit Intermittent?

The common symptoms include inaccurate temperature readings on the vehicle's display, incorrect climate control system operation, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code P0074 GMC indicating an Ambient Air Temperature Sensor Circuit Intermittent issue?

The potential causes include a faulty ambient air temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the sensor's ground connection.

3. How can I diagnose the OBDII code P0074 GMC for an Ambient Air Temperature Sensor Circuit Intermittent problem?

You can diagnose the code by visually inspecting the sensor and its wiring, testing the sensor's resistance with a multimeter, and checking for any loose or corroded connections in the circuit.

4. Can I drive my vehicle with OBDII code P0074 GMC triggered due to an Ambient Air Temperature Sensor Circuit Intermittent issue?

It is generally safe to drive the vehicle with this code, but it is recommended to have the sensor circuit inspected and repaired to ensure accurate temperature readings and proper climate control system functionality.

5. How can I repair OBDII code P0074 GMC associated with an Ambient Air Temperature Sensor Circuit Intermittent fault?

The repair process typically involves replacing the faulty ambient air temperature sensor, repairing any damaged wiring or connectors, and ensuring a secure ground connection for the sensor.

6. Are there any DIY tips for fixing OBDII code P0074 GMC linked to the Ambient Air Temperature Sensor Circuit Intermittent?

DIY enthusiasts can attempt to replace the ambient air temperature sensor themselves by following the vehicle's service manual or watching online tutorials. However, if unsure, it's best to seek professional assistance.

7. Will resetting the OBDII system clear the P0074 GMC code caused by an Ambient Air Temperature Sensor Circuit Intermittent problem?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the sensor circuit is not addressed, the code is likely to reappear once the problem resurfaces.

8. Can extreme weather conditions affect the triggering of OBDII code P0074 GMC related to the Ambient Air Temperature Sensor Circuit Intermittent?

Extreme temperatures, such as severe cold or heat, can sometimes impact the sensor's performance and trigger the code. Ensuring the sensor is properly insulated and shielded can help mitigate such issues.

9. Is it necessary to replace the entire ambient air temperature sensor assembly for OBDII code P0074 GMC, or can individual components be repaired?

In most cases, replacing the entire ambient air temperature sensor assembly is recommended to ensure optimal performance and reliability. However, individual components like wiring or connectors can be repaired if the damage is minimal.

10. How much can I expect to pay for repairing OBDII code P0074 GMC caused by an Ambient Air Temperature Sensor Circuit Intermittent issue?

The cost of repair can vary depending on the labor rates in your area, the price of the replacement sensor, and any additional parts or repairs needed. It is advisable to get a few quotes from different automotive service providers.