P0099 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P0099 GMC?
- 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 GMC?
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 GMC 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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Information for Specific GMC Models
- P0099 2014 GMC Sierra — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2015 GMC Sierra — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2016 GMC Sierra — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2017 GMC Sierra — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2018 GMC Sierra — Intake Air Temperature Sensor 2 Circuit Intermittent
Frequently Asked Questions about P0099 GMC Code
1. What are the common symptoms of OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?
- Common symptoms include poor engine performance, rough idling, stalling, decreased fuel efficiency, and potential issues with the vehicle's emissions.
2. What are the possible causes of OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?
- Possible causes include a faulty intake air temperature sensor, wiring or connector issues, sensor circuit malfunctions, or issues with the engine control module.
3. How can I diagnose the Intake Air Temperature Sensor 2 Circuit Intermittent issue causing OBDII code P0099 (GMC)?
- To diagnose the problem, you can use a scan tool to check for the specific error code, visually inspect the sensor and its wiring for damage, and perform electrical tests to determine if the sensor is functioning correctly.
4. Can I drive my vehicle with OBDII code P0099 (GMC) triggered by the Intake Air Temperature Sensor 2 Circuit Intermittent issue?
- It is not recommended to drive your vehicle with this issue as it can lead to further engine problems and decreased performance.
5. How do I repair the Intake Air Temperature Sensor 2 Circuit Intermittent problem causing OBDII code P0099 (GMC)?
- The repair process may involve replacing the faulty intake air temperature sensor, repairing or replacing damaged wiring or connectors, or resetting the engine control module.
6. Are there any DIY tips for addressing OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?
- DIY tips include checking and cleaning the sensor connections, inspecting the wiring for any visible damage, and ensuring the sensor is securely mounted in place.
7. Can a malfunctioning Intake Air Temperature Sensor 2 Circuit cause other issues in the vehicle?
- Yes, a malfunctioning sensor can lead to poor engine performance, potential damage to engine components, and may trigger other error codes related to the engine's operation.
8. How important is the Intake Air Temperature Sensor for the overall functioning of the vehicle?
- The Intake Air Temperature Sensor plays a crucial role in providing the engine control module with accurate data for fuel delivery and engine performance, making it an essential component for efficient vehicle operation.
9. Is it recommended to clear the OBDII code P0099 (GMC) after repairing the Intake Air Temperature Sensor 2 Circuit Intermittent issue?
- Yes, it is recommended to clear the error code after the repair to reset the engine control module and ensure that the issue has been successfully addressed.
10. How can I prevent future occurrences of OBDII code P0099 (GMC) related to the Intake Air Temperature Sensor 2 Circuit Intermittent?
- Regular maintenance checks, timely replacement of sensors, and addressing any issues with the intake air temperature sensor promptly can help prevent future instances of this error code.
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