P0099 2014 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 2014 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 2014 GMC Sierra Description
What are the Possible Causes of the DTC P0099 2014 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 2014 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 2014 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 2014 GMC Sierra Code
What does the OBDII code P0099 mean on a 2014 GMC Sierra?
1. P0099 indicates an intermittent issue with the Intake Air Temperature (IAT) Sensor 2 circuit, meaning the sensor is not consistently providing accurate readings to the engine control module (ECM). 2.
What are the symptoms of code P0099 on a 2014 GMC Sierra?
Common symptoms include poor engine performance, reduced fuel efficiency, difficulty starting the engine, and a check engine light illuminated on the dashboard. 3.
What causes the P0099 code to appear on a 2014 GMC Sierra?
Potential causes include a faulty IAT Sensor 2, damaged or corroded wiring or connectors, a short or open circuit in the sensor circuit, or, less commonly, a malfunction in the ECM itself. 4.
Can I drive my 2014 GMC Sierra with the P0099 code?
While the vehicle may still be drivable, prolonged operation with this code can lead to poor engine performance and potential damage. It’s best to address the issue promptly. 5.
How do I fix the P0099 code on a 2014 GMC Sierra?
Start by inspecting the IAT Sensor 2 and its wiring for damage or corrosion. Clean or replace any damaged connectors, repair broken wires, and replace the sensor if necessary. If the issue persists, further diagnose the ECM. 6.
Where is the IAT Sensor 2 located on a 2014 GMC Sierra?
IAT Sensor 2 is typically located near the intake manifold or air intake system. Refer to the vehicle’s service manual for the exact location. 7.
How much does it cost to fix the P0099 code on a 2014 GMC Sierra?
Repair costs vary depending on the issue. Replacing the IAT sensor typically costs $50-$150 for parts and labor. Wiring repairs may add to the cost. 8.
What tools are needed to diagnose and fix the P0099 code?
You’ll need an OBDII scanner, a multimeter for testing electrical circuits, and basic hand tools to remove and replace components. 9.
Could a dirty air filter cause the P0099 code on a 2014 GMC Sierra?
A dirty air filter is unlikely to directly cause the P0099 code but can contribute to airflow issues that may affect sensor performance. Check and replace the air filter if needed. 10.
How can I prevent the P0099 code from recurring on my 2014 GMC Sierra?
Regular maintenance, including inspecting and cleaning electrical connections, replacing the air filter, and ensuring the intake system is free of debris, can help prevent this code from reoccurring.
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