P0099 2018 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 2018 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 2018 GMC Sierra Description
What are the Possible Causes of the DTC P0099 2018 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 2018 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 2018 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 2018 GMC Sierra Code
1. What are the common symptoms of OBDII code P0099 in a 2018 GMC Sierra related to the Intake Air Temperature Sensor 2 Circuit Intermittent?
- Common symptoms may include rough idling, poor engine performance, reduced fuel efficiency, and potential stalling.
2. What are some possible causes of the Intake Air Temperature Sensor 2 Circuit Intermittent issue in a 2018 GMC Sierra?
- Causes can range from a faulty intake air temperature sensor, damaged wiring or connectors, to issues with the sensor's circuit.
3. How can I diagnose the Intake Air Temperature Sensor 2 Circuit Intermittent problem in my 2018 GMC Sierra?
- You can use an OBDII scanner to retrieve the specific trouble code P0099, visually inspect the sensor and its wiring, and perform tests to check for proper sensor operation.
4. Is it safe to continue driving my 2018 GMC Sierra with the P0099 code related to the Intake Air Temperature Sensor issue?
- It's generally not recommended to drive with this issue as it can lead to further engine problems and potential damage if left unresolved.
5. Can I repair the Intake Air Temperature Sensor 2 Circuit Intermittent problem in my 2018 GMC Sierra myself?
- Depending on your skill level, you may be able to replace the sensor or repair wiring issues yourself. However, professional diagnosis and repair are recommended for accurate and lasting solutions.
6. Are there any quick fixes or temporary solutions for the P0099 code in a 2018 GMC Sierra?
- Quick fixes like clearing the trouble code may temporarily alleviate symptoms, but it's essential to address the root cause to prevent further issues.
7. How much does it typically cost to repair the Intake Air Temperature Sensor 2 Circuit Intermittent problem in a 2018 GMC Sierra?
- Repair costs can vary based on the specific cause of the issue, but expenses may include sensor replacement, wiring repairs, and labor charges from a mechanic.
8. Will resetting the ECU clear the P0099 trouble code associated with the Intake Air Temperature Sensor in my 2018 GMC Sierra?
- Resetting the ECU may temporarily clear the code, but if the underlying problem persists, the code is likely to reappear after driving cycles.
9. Can a bad Intake Air Temperature Sensor affect the emissions system in a 2018 GMC Sierra?
- Yes, a malfunctioning sensor can impact the air-fuel mixture, potentially leading to increased emissions, which could cause the vehicle to fail emissions tests.
10. What steps should I take if the P0099 code related to the Intake Air Temperature Sensor issue keeps recurring in my 2018 GMC Sierra after repairs?
- If the code persists after repairs, it's advisable to have a professional mechanic conduct a thorough diagnostic to identify any underlying issues that may have been overlooked during previous repairs.
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