P0099 2017 GMC Sierra Code - Intake Air Temperature Sensor 2 Circuit Intermittent
Quick Answer
The P0099 diagnostic trouble code (DTC) for a 2017 GMC Sierra refers to the Intake Air Temperature Sensor 2 Circuit Intermittent. Common causes include Faulty Intake Air Temperature Sensor: The sensor itself may be faulty or damaged, causing intermittent readings, Wiring Issues: Loose or damaged wiring connections between the sensor and the ECM can lead to intermittent signals, Corrosion: Corrosion or contamination in the sensor or wiring can disrupt the circuit and cause intermittent issues. 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
- P0099 2017 GMC Sierra indicates Intake Air Temperature Sensor 2 Circuit Intermittent.
- Common causes
- Common causes include Faulty Intake Air Temperature Sensor: The sensor itself may be faulty or damaged, causing intermittent readings, Wiring Issues: Loose or damaged wiring connections between the sensor and the ECM can lead to intermittent signals, Corrosion: Corrosion or contamination in the sensor or wiring can disrupt the circuit and cause intermittent issues.
- 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 P0099 2017 GMC Sierra Description
The P0099 diagnostic trouble code (DTC) for a 2017 GMC Sierra refers to the Intake Air Temperature Sensor 2 Circuit Intermittent. This code indicates that the Engine Control Module (ECM) has detected a problem with the intake air temperature sensor circuit, specifically sensor 2. The intake air temperature sensor is responsible for measuring the temperature of the air entering the engine, which is crucial for the engine's performance and fuel efficiency.
Common Causes of P0099 2017 GMC Sierra
- Faulty Intake Air Temperature Sensor: The sensor itself may be faulty or damaged, causing intermittent readings.
- Wiring Issues: Loose or damaged wiring connections between the sensor and the ECM can lead to intermittent signals.
- Corrosion: Corrosion or contamination in the sensor or wiring can disrupt the circuit and cause intermittent issues.
- ECM Malfunction: A malfunctioning ECM can also cause intermittent communication with the intake air temperature sensor.
- Environmental Factors: Extreme temperatures or exposure to moisture can affect the sensor's performance and lead to intermittent readings.
Symptoms of P0099 2017 GMC Sierra
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
- Rough Idling: The engine may experience rough idling or fluctuations in RPMs due to incorrect air/fuel mixture.
- Decreased Fuel Economy: A faulty intake air temperature sensor can lead to decreased fuel efficiency as the engine may not be running at optimal conditions.
- Engine Stalling: In severe cases, the engine may stall or have difficulty starting due to incorrect air/fuel mixture calculations.
- Poor Acceleration: The vehicle may exhibit sluggish acceleration or lack of power when the intake air temperature sensor is malfunctioning.
How to Fix P0099 2017 GMC Sierra
- Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the intake air temperature sensor and its wiring.
- Replace the Intake Air Temperature Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
- Check Wiring Connections: Inspect the wiring connections for any damage or corrosion, and repair or replace as needed.
- Clear the DTC: After completing the repair, clear the DTC with a scan tool and test drive the vehicle to ensure the issue has been resolved.
- Perform a Relearn Procedure: Some vehicles may require a relearn procedure for the ECM to recalibrate with the new sensor.
Cost to Fix P0099 2017 GMC Sierra
The typical repair costs for addressing a P0099 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of a new intake air temperature sensor can range from $50 to $100, while labor costs for diagnosis and repair can range from $100 to $300. Overall, the total repair cost for this issue may fall between $150 and $400, but it's important to note that prices can vary based on location, shop rates, and the need for additional repairs. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on your vehicle's specific needs.
Tech Notes for P0099 2017 GMC Sierra
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Frequently Asked Questions about P0099 2017 GMC Sierra Code
What does the OBDII code P0099 mean for a 2017 GMC Sierra?
P0099 indicates an intermittent issue with the Intake Air Temperature (IAT) Sensor 2 circuit, which monitors air temperature entering the engine for optimal fuel and ignition timing.
What are the symptoms of code P0099 in a 2017 GMC Sierra?
Common symptoms include a check engine light, reduced fuel efficiency, rough idling, poor engine performance, and potentially difficulty starting the vehicle.
What causes the P0099 code to appear?
Causes can include a faulty IAT sensor 2, damaged wiring or connectors, corrosion in the circuit, or intermittent electrical issues within the sensor circuit.
Can I drive my 2017 GMC Sierra with the P0099 code?
While the vehicle may still be drivable, driving with this code can lead to reduced engine performance and efficiency. It's best to address the issue promptly to avoid further damage.
How do I diagnose the P0099 code on my 2017 GMC Sierra?
Use an OBDII scanner to confirm the code, then inspect the IAT sensor 2, its wiring, and connectors for damage or corrosion. A multimeter can help check for proper voltage and continuity.
How do I fix the P0099 code on a 2017 GMC Sierra?
Repairs may involve replacing the IAT sensor 2, repairing or replacing damaged wiring or connectors, cleaning corrosion, or reprogramming the ECU if necessary.
Where is the IAT sensor 2 located on a 2017 GMC Sierra?
The IAT sensor 2 is typically located in the intake manifold or near the air intake system. Refer to the vehicle's service manual for the exact location.
How much does it cost to fix the P0099 code on a 2017 GMC Sierra?
Repair costs vary based on the issue. Replacing the IAT sensor 2 can cost $50–$200 for parts, plus labor, which may add another $50–$150 depending on the shop.
Can a dirty air filter cause the P0099 code?
A dirty air filter generally won't cause this code directly, but restricted airflow might affect the IAT sensor readings, leading to potential issues.
Do I need to reset the ECU after fixing the P0099 code?
Yes, after repairs, clear the code using an OBDII scanner. If the issue is resolved, the code should not return.
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