P0074 2018 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 2018 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.
Code P0074 2018 GMC Sierra Description
What are the Possible Causes of the DTC P0074 2018 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 2018 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 2018 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 2018 GMC Sierra code?
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Frequently Asked Questions about P0074 2018 GMC Sierra Code
1. What does the OBDII code P0074 mean for a 2018 GMC Sierra?
P0074 indicates an intermittent issue with the Ambient Air Temperature Sensor Circuit, which monitors the outside air temperature.
2. What are common symptoms of the P0074 code in a 2018 GMC Sierra?
Symptoms include inaccurate or fluctuating outside temperature readings, HVAC performance issues, and possibly triggering the check engine light.
3. What causes the P0074 code in a 2018 GMC Sierra?
Common causes include a malfunctioning ambient air temperature sensor, damaged wiring or connectors, or a faulty PCM (Powertrain Control Module).
4. How do I fix the P0074 code on my 2018 GMC Sierra?
Inspect and repair any damaged wiring or connectors, replace the ambient air temperature sensor if faulty, and clear the code to see if it resolves the issue.
5. Where is the ambient air temperature sensor located on a 2018 GMC Sierra?
The sensor is typically located near the front grille or behind the front bumper, exposed to outside air.
6. Can I drive my 2018 GMC Sierra with the P0074 code?
Yes, but it may affect HVAC functionality and fuel efficiency, so it's best to address the issue promptly.
7. How do I test the ambient air temperature sensor on a 2018 GMC Sierra?
Use a multimeter to check the sensor's resistance and compare it to the manufacturer's specifications for accuracy.
8. Does a P0074 code affect engine performance in a 2018 GMC Sierra?
Not directly, but it can affect fuel efficiency and HVAC system operations due to inaccurate temperature data.
9. Can extreme weather cause the P0074 code on a 2018 GMC Sierra?
Yes, extreme temperatures or moisture can sometimes disrupt sensor function or wiring connections, leading to an intermittent circuit issue.
10. How much does it cost to repair a P0074 code on a 2018 GMC Sierra?
The cost depends on the cause, but replacing an ambient air temperature sensor typically ranges from $50 to $150, plus labor if necessary.
Discuss the causes and fixes for P0074 2018 GMC Sierra OBDII Code
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