AutoCodes – Chevrolet – P0074 Chevrolet

P0074 Chevrolet 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 Chevrolet 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 692

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

What does this mean?

What are the Possible Causes of the DTC P0074 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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

Information for Specific Chevrolet Models

P0074 2014 Chevrolet Silverado — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2015 Chevrolet Silverado — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2016 Chevrolet Silverado — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2017 Chevrolet Silverado — Ambient Air Temperature Sensor Circuit Intermittent
P0074 2018 Chevrolet Silverado — 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 Chevrolet Code

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

- Common symptoms include inaccurate temperature readings on the vehicle's display, issues with the vehicle's automatic climate control system, and potential impact on fuel efficiency.

2. What are some possible causes of the P0074 code in a Chevrolet due to the Ambient Air Temperature Sensor Circuit Intermittent?

- Potential causes include a faulty ambient air temperature sensor, damaged sensor wiring or connectors, corrosion or loose connections, or issues with the sensor's placement or surroundings.

3. How can I diagnose the Ambient Air Temperature Sensor Circuit Intermittent issue causing the P0074 code in my Chevrolet?

- Diagnosing the problem involves visually inspecting the sensor and its wiring, checking for corrosion or damage, using a multimeter to test sensor continuity, and verifying sensor readings with a scan tool.

4. Can I drive my Chevrolet with the P0074 code related to the Ambient Air Temperature Sensor Circuit Intermittent?

- While it may be possible to drive the vehicle with this code, it is recommended to address the issue promptly to prevent potential problems with the automatic climate control system and ensure accurate temperature readings.

5. How can I repair the Ambient Air Temperature Sensor Circuit Intermittent problem causing the P0074 code in my Chevrolet?

- Repairing the issue may involve replacing the ambient air temperature sensor, repairing damaged wiring or connectors, cleaning corroded connections, or ensuring proper placement of the sensor for accurate readings.

6. Will resetting the OBDII code P0074 related to the Ambient Air Temperature Sensor Circuit Intermittent make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again during vehicle operation.

7. Can extreme weather conditions affect the performance of the Ambient Air Temperature Sensor Circuit in a Chevrolet and trigger the P0074 code?

- Yes, extreme temperatures, moisture, or exposure to harsh environmental conditions can impact the sensor's operation and contribute to intermittent issues, leading to the P0074 trouble code.

8. Is it possible for a DIY enthusiast to replace the Ambient Air Temperature Sensor in a Chevrolet to resolve the P0074 code?

- Yes, replacing the ambient air temperature sensor can be a relatively straightforward DIY task for those with basic automotive repair skills and the necessary tools. Following a repair manual or online guides is recommended.

9. Are there any recalls or technical service bulletins related to the Ambient Air Temperature Sensor Circuit Intermittent issue and the P0074 code in Chevrolet vehicles?

- It's advisable to check with a Chevrolet dealership or online databases for any relevant recalls or technical service bulletins specifically addressing the P0074 code related to the Ambient Air Temperature Sensor Circuit Intermittent in your vehicle model.

10. How crucial is it to address the P0074 code linked to the Ambient Air Temperature Sensor Circuit Intermittent promptly in a Chevrolet?

- Promptly addressing the P0074 code is important to ensure proper functionality of the automatic climate control system, accurate temperature readings, and overall vehicle performance. Delaying repairs could lead to further issues and potential complications.