P0074 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P0074 2015 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 2015 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 2015 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.
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Frequently Asked Questions about P0074 2015 GMC Sierra Code
1. What does the OBDII code P0074 mean on a 2015 GMC Sierra?
The P0074 code indicates an intermittent issue with the Ambient Air Temperature Sensor Circuit, meaning the sensor is not consistently providing accurate readings to the engine control module (ECM).
2. What are the symptoms of code P0074 in a 2015 GMC Sierra?
Common symptoms include incorrect outside temperature readings, potential HVAC performance issues, and possible illumination of the check engine light.
3. What causes the P0074 code on a GMC Sierra?
Causes may include a faulty ambient air temperature sensor, damaged or corroded wiring, poor electrical connections, or a malfunctioning ECM.
4. Can I drive my 2015 GMC Sierra with a P0074 code?
Yes, you can drive with this code, but incorrect temperature readings may affect HVAC performance and fuel efficiency in certain conditions.
5. How do I fix the P0074 code on my 2015 GMC Sierra?
Start by inspecting the ambient air temperature sensor and its wiring for damage or corrosion. Replace the sensor if necessary, and repair or clean any faulty connections.
6. Where is the ambient air temperature sensor located on a 2015 GMC Sierra?
The ambient air temperature sensor is typically located near the front grille or bumper area of the vehicle, exposed to outside air.
7. How do I test the ambient air temperature sensor for a P0074 code?
Use a multimeter to check the sensor’s resistance and compare it to the manufacturer’s specifications. If the values are out of range, the sensor may need to be replaced.
8. Can a bad ambient air temperature sensor cause poor gas mileage?
While not common, a faulty sensor could indirectly affect fuel efficiency by providing incorrect data to the ECM, which may impact air-fuel mixture adjustments.
9. Will clearing the P0074 code fix the issue?
Clearing the code may temporarily remove the check engine light, but the underlying issue must be addressed to prevent the code from returning.
10. How much does it cost to repair a P0074 code on a 2015 GMC Sierra?
Repair costs can vary, but replacing the ambient air temperature sensor typically costs between $50 and $150, including parts and labor. Wiring repairs may cost more depending on the extent of the damage.
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