P0099 2017 GMC Sierra Code - Intake Air Temperature Sensor 2 Circuit Intermittent
Quick Answer
The Intake Air Temperature (IAT) sensor 1 is a variable resistor that changes the voltage on the Engine Control Module (ECM) supplied 5 V signal circuit. Common causes include Faulty Intake Air Temperature (IAT) sensor, Intake Air Temperature sensor harness is open or shorted, Intake 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
- P0099 2017 GMC Sierra indicates Intake Air Temperature Sensor 2 Circuit Intermittent.
- Common causes
- Common causes include Faulty Intake Air Temperature (IAT) sensor, Intake Air Temperature sensor harness is open or shorted, Intake 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 P0099 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0099 2017 GMC Sierra?
- Faulty Intake Air Temperature (IAT) sensor
- Intake Air Temperature sensor harness is open or shorted
- Intake Air Temperature sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0099 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.
Code Tech Notes
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0099 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.
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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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