P0099 Code - Intake Air Temperature Sensor 2 Circuit Intermittent
Quick Answer
The P0099 code indicates a problem with the Intake Air Temperature Sensor 2 Circuit being intermittent. Common causes include Faulty Intake Air Temperature Sensor 2, Damaged or corroded wiring/connectors, Issues with the ECM. 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 indicates Intake Air Temperature Sensor 2 Circuit Intermittent.
- Common causes
- Common causes include Faulty Intake Air Temperature Sensor 2, Damaged or corroded wiring/connectors, Issues with the ECM.
- 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 Description
The P0099 code indicates a problem with the Intake Air Temperature Sensor 2 Circuit being intermittent. The Intake Air Temperature (IAT) sensor is a crucial component of the vehicle's engine management system. It measures the temperature of the incoming air to the engine, which is important for determining the air-fuel mixture and ignition timing. The IAT sensor provides this information to the engine control module (ECM), allowing it to adjust the engine performance accordingly.
Common Causes of P0099
- Faulty Intake Air Temperature Sensor 2.
- Damaged or corroded wiring/connectors.
- Issues with the ECM.
- Air intake system leaks or restrictions.
- High resistance in the IAT sensor circuit.
Symptoms of P0099
- Check Engine Light is illuminated on the dashboard.
- Decreased fuel efficiency.
- Rough idling or stalling.
- Engine misfires.
- Reduced engine performance.
How to Fix P0099
- Begin by diagnosing the specific cause of the intermittent signal, using a scan tool to retrieve the freeze frame data and any related codes.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as needed.
- Test the Intake Air Temperature Sensor 2 using a multimeter to ensure it is functioning correctly. Replace if necessary.
- Clear the diagnostic trouble codes from the ECM and perform a test drive to verify that the issue has been resolved.
- If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the intermittent signal.
Cost to Fix P0099
The cost of repairing the Intake Air Temperature Sensor 2 Circuit Intermittent issue can vary depending on the specific cause of the problem and the labor rates at the auto repair shop. Generally, the cost of replacing the Intake Air Temperature Sensor 2 itself ranges from $50 to $150, while the labor cost can be between $80 and $150 per hour. In total, the repair cost for this issue can range from $150 to $300, excluding any additional diagnostic fees or parts that may be needed. It is recommended to consult with a professional mechanic for a more accurate estimate based on your vehicle's make and model.
Tech Notes for P0099
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Code P0099 Information for Specific Makes
- P0099 Buick — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 Cadillac — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 Chevrolet — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 GMC — Intake Air Temperature Sensor 2 Circuit Intermittent
Frequently Asked Questions about P0099 Code
1. What are the common symptoms of OBDII code P0099 (Intake Air Temperature Sensor 2 Circuit Intermittent)?
- Common symptoms include rough idling, poor engine performance, decreased fuel efficiency, and potential stalling.
2. What can cause the OBDII code P0099 to appear?
- The code may be triggered by a faulty intake air temperature sensor, wiring issues, poor connections, or a problem with the sensor circuit.
3. How can I diagnose the cause of OBDII code P0099?
- You can start by visually inspecting the sensor and its wiring for any damage. Using a multimeter, test the sensor's resistance and voltage readings to determine if it is functioning properly.
4. Can a dirty air filter trigger OBDII code P0099?
- Yes, a dirty air filter can disrupt the intake air temperature readings, potentially leading to the intermittent circuit issue and triggering the code.
5. Is it safe to continue driving with OBDII code P0099 present?
- It is not recommended to drive with the code active, as it can lead to poor engine performance and fuel efficiency, potentially causing further damage over time.
6. How can I repair OBDII code P0099?
- Repair options include replacing the intake air temperature sensor, repairing any damaged wiring or connections, cleaning the sensor, and ensuring proper installation.
7. Can a DIY enthusiast fix OBDII code P0099?
- Depending on your mechanical skills and access to tools, DIY enthusiasts can attempt to diagnose and repair the issue themselves, but it is advisable to seek professional help if unsure.
8. Will resetting the OBDII system clear the P0099 code?
- Resetting the system may temporarily clear the code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.
9. How much does it cost to repair OBDII code P0099 at a mechanic?
- The cost of repair can vary depending on the exact cause of the issue, but it generally ranges from $100 to $300, including parts and labor.
10. Are there any preventive measures to avoid OBDII code P0099 in the future?
- Regularly inspecting and maintaining the intake air temperature sensor, ensuring proper air filter maintenance, and addressing any wiring issues promptly can help prevent the recurrence of the code.
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