AutoCodes – GMC – P0074 2017 GMC Sierra

P0074 2017 GMC Sierra 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 2017 GMC Sierra 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 198

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 2017 GMC Sierra 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 2017 GMC Sierra - Ambient Air Temperature Sensor Circuit Intermittent - AutoCodes.com — P0074 2017 GMC Sierra Code - Ambient Air Temperature Sensor Circuit Intermittent

What does this mean?

What are the Possible Causes of the DTC P0074 2017 GMC Sierra?

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 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra code?

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Need Help with the Code?

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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 2017 GMC Sierra Code

1. What does the OBDII code P0074 mean on a 2017 GMC Sierra?

P0074 indicates an intermittent issue in the ambient air temperature sensor circuit, which measures the air temperature outside the vehicle.

2. What are the common symptoms of a P0074 code?

Symptoms may include erratic or inaccurate outside temperature readings, improper operation of the HVAC system, or potential impacts on fuel efficiency.

3. What causes the P0074 code to appear?

Common causes include a faulty ambient air temperature sensor, damaged wiring or connectors, corrosion, or a malfunctioning PCM (Powertrain Control Module).

4. Can the P0074 code affect my vehicle's performance?

While it may not directly impact performance, it can influence systems like the HVAC or automatic climate controls, and in rare cases, affect engine management.

5. Where is the ambient air temperature sensor located on a 2017 GMC Sierra?

It is typically mounted near the front grille or bumper to measure outside air temperature accurately.

6. How do I diagnose the P0074 code?

Start by visually inspecting the sensor and its wiring for damage or corrosion, then use a multimeter to check for proper voltage and continuity in the circuit.

7. Can I drive with a P0074 code?

Yes, but prolonged driving without addressing the issue may result in improper HVAC operation or potential miscalculations in engine management systems.

8. How do I fix a P0074 code?

Repairs can include replacing the ambient air temperature sensor, repairing damaged wiring or connectors, or in rare cases, reprogramming or replacing the PCM.

9. How much does it cost to fix a P0074 code?

Replacing the ambient air temperature sensor typically costs $50â€“$150, while labor and additional repairs for wiring or the PCM can increase the total cost.

10. Can a P0074 code clear itself?

If the issue is intermittent and resolves temporarily, the code may clear itself, but the underlying problem will likely return if not addressed.