P0099 Chevrolet Code - Intake Air Temperature Sensor 2 Circuit Intermittent
Quick Answer
The P0099 diagnostic trouble code for Chevrolet vehicles indicates an issue with the Intake Air Temperature Sensor 2 Circuit being intermittent. Common causes include Wiring Issues: Damage, corrosion, or loose connections in the wiring harness connecting the IAT sensor 2 to the ECM can disrupt the signal, Faulty IAT Sensor: A malfunctioning or failed IAT sensor can provide inaccurate temperature readings, leading to performance issues, ECM Malfunction: A problem with the engine control module (ECM) can prevent it from interpreting the IAT sensor 2 signals correctly, causing intermittent circuit issues. 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 Chevrolet indicates Intake Air Temperature Sensor 2 Circuit Intermittent.
- Common causes
- Common causes include Wiring Issues: Damage, corrosion, or loose connections in the wiring harness connecting the IAT sensor 2 to the ECM can disrupt the signal, Faulty IAT Sensor: A malfunctioning or failed IAT sensor can provide inaccurate temperature readings, leading to performance issues, ECM Malfunction: A problem with the engine control module (ECM) can prevent it from interpreting the IAT sensor 2 signals correctly, causing intermittent circuit issues.
- 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 Chevrolet Description
The P0099 diagnostic trouble code for Chevrolet vehicles indicates an issue with the Intake Air Temperature Sensor 2 Circuit being intermittent. The Intake Air Temperature Sensor (IAT) is a crucial component of the engine's control system, as it measures the temperature of the air entering the engine. This information is used by the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The IAT sensor 2 is typically located after the throttle body and is responsible for providing accurate temperature readings to the ECM.
Common Causes of P0099 Chevrolet
- Wiring Issues: Damage, corrosion, or loose connections in the wiring harness connecting the IAT sensor 2 to the ECM can disrupt the signal.
- Faulty IAT Sensor: A malfunctioning or failed IAT sensor can provide inaccurate temperature readings, leading to performance issues.
- ECM Malfunction: A problem with the engine control module (ECM) can prevent it from interpreting the IAT sensor 2 signals correctly, causing intermittent circuit issues.
- Environmental Factors: Exposure to extreme temperatures, moisture, or contaminants can also affect the IAT sensor 2's performance and trigger the P0099 code.
Symptoms of P0099 Chevrolet
- Check Engine Light: The most common symptom associated with the P0099 code is the illumination of the check engine light on the vehicle's dashboard.
- Poor Engine Performance: The vehicle may experience rough idling, hesitation during acceleration, and a decrease in overall power.
- Reduced Fuel Efficiency: Incorrect air-fuel mixture adjustments can lead to decreased fuel efficiency, causing the vehicle to consume more fuel than usual.
- Engine Stalling: In severe cases, the engine may stall while driving or idling, indicating a significant issue with the IAT sensor 2 circuit.
How to Fix P0099 Chevrolet
- Diagnose the Issue: Use a diagnostic scanner to retrieve the P0099 code and perform a thorough inspection of the IAT sensor 2 circuit, wiring, and connections.
- Test the IAT Sensor: Check the IAT sensor 2 for proper operation and resistance values using a multimeter to determine if it needs replacement.
- Inspect Wiring Harness: Examine the wiring harness for any damage, corrosion, or loose connections, repairing or replacing any affected components.
- Replace IAT Sensor: If the sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate temperature readings.
- Clear Codes and Test: After completing the repairs, clear the diagnostic trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0099 Chevrolet
The typical repair costs for addressing the P0099 code related to the Intake Air Temperature Sensor 2 Circuit Intermittent can vary depending on the specific cause of the issue and the labor rates at auto repair shops. In general, replacing the IAT sensor or repairing wiring issues can range from $100 to $300, including parts and labor. However, if the ECM needs to be replaced, the costs can increase significantly. It's important to consider that diagnosis time and labor rates can vary based on location, vehicle make and model, and the expertise of the technician. It's advisable to consult with local auto repair shops for a more accurate estimate based on your specific circumstances.
Tech Notes for P0099 Chevrolet
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Information for Specific Chevrolet Models
- P0099 2014 Chevrolet Silverado — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2015 Chevrolet Silverado — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2016 Chevrolet Silverado — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2017 Chevrolet Silverado — Intake Air Temperature Sensor 2 Circuit Intermittent
- P0099 2018 Chevrolet Silverado — Intake Air Temperature Sensor 2 Circuit Intermittent
Frequently Asked Questions about P0099 Chevrolet Code
1. What are the common symptoms of OBDII code P0099 in a Chevrolet related to the Intake Air Temperature Sensor 2 Circuit Intermittent?
The common symptoms include rough idling, decreased fuel efficiency, and potential stalling of the engine.
2. What are the possible causes of OBDII code P0099 in a Chevrolet?
Possible causes include a faulty intake air temperature sensor, damaged wiring or connectors, or issues with the engine control module (ECM).
3. How can I diagnose the Intake Air Temperature Sensor 2 Circuit Intermittent issue in my Chevrolet?
You can use an OBDII scanner to retrieve the specific trouble code P0099 and then visually inspect the sensor, wiring, and connectors for any visible damage.
4. Can a dirty air filter trigger the OBDII code P0099 in a Chevrolet?
Yes, a dirty air filter can affect the intake air temperature readings and potentially trigger the P0099 code due to incorrect sensor readings.
5. Is it safe to continue driving my Chevrolet with the OBDII code P0099 related to the Intake Air Temperature Sensor 2 Circuit Intermittent?
It is not recommended to drive your vehicle with this code present, as it can lead to poor engine performance and potential damage if left unresolved.
6. What is the typical repair process for fixing OBDII code P0099 in a Chevrolet?
The repair process usually involves replacing the faulty intake air temperature sensor, repairing any damaged wiring or connectors, and clearing the trouble code from the ECM.
7. Can I fix the Intake Air Temperature Sensor 2 Circuit Intermittent issue in my Chevrolet myself?
If you have the necessary tools and automotive knowledge, you may be able to replace the sensor or repair the wiring yourself. Otherwise, it's best to seek professional help.
8. Are there any preventive measures I can take to avoid OBDII code P0099 in my Chevrolet?
Regularly inspecting and maintaining the intake air temperature sensor, air filter, and related components can help prevent issues that may trigger the P0099 trouble code.
9. How long does it typically take to repair the Intake Air Temperature Sensor 2 Circuit Intermittent problem in a Chevrolet?
The repair time can vary depending on the extent of the issue and the availability of parts, but it usually takes a few hours to complete the repair.
10. Will resetting the ECM clear the OBDII code P0099 from my Chevrolet's system?
Resetting the ECM may temporarily clear the trouble code, but if the underlying issue causing the P0099 code is not addressed, it is likely to reappear.
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