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P0114 2018 GMC Sierra Code - Intake Air Temperature Circuit Intermittent

Quick Answer

The P0114 diagnostic trouble code (DTC) indicates an intermittent issue with the Intake Air Temperature (IAT) sensor circuit in a 2018 GMC Sierra. Common causes include Faulty IAT sensor, Damaged wiring or connectors in the IAT circuit, Corrosion or poor connections at the sensor or 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
P0114 2018 GMC Sierra indicates Intake Air Temperature Circuit Intermittent.
Common causes
Common causes include Faulty IAT sensor, Damaged wiring or connectors in the IAT circuit, Corrosion or poor connections at the sensor or 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.
What is this?
Table of contents Created and updated by William Orellana on Oct 07, 2024
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Code P0114 2018 GMC Sierra Description

The P0114 diagnostic trouble code (DTC) indicates an intermittent issue with the Intake Air Temperature (IAT) sensor circuit in a 2018 GMC Sierra. The IAT sensor plays a crucial role in the vehicle's engine management system by measuring the temperature of the air entering the engine. This data is vital for the Engine Control Module (ECM) to optimize fuel injection, ignition timing, and overall engine performance. When the IAT sensor circuit experiences intermittent faults, it can lead to incorrect temperature readings, which may cause the ECM to miscalculate the air-fuel mixture.

OBDII Code P0114 2018 GMC Sierra - Intake Air Temperature Circuit Intermittent
P0114 2018 GMC Sierra Code - Intake Air Temperature Circuit Intermittent

Common Causes of P0114 2018 GMC Sierra

  1. Faulty IAT sensor.
  2. Damaged wiring or connectors in the IAT circuit.
  3. Corrosion or poor connections at the sensor or ECM.
  4. Issues with the Engine Control Module (ECM).
  5. Air intake leaks or obstructions affecting sensor readings.

Symptoms of P0114 2018 GMC Sierra

  1. Check Engine Light illuminated.
  2. Poor engine performance, including hesitation or stalling.
  3. Decreased fuel efficiency.
  4. Rough idle or engine misfires.
  5. Increased emissions or failed emissions test.

How to Fix P0114 2018 GMC Sierra

  1. Visual Inspection: Begin with a thorough visual inspection of the IAT sensor, wiring, and connectors for signs of damage, corrosion, or loose connections.
  2. Sensor Testing: Use a multimeter to test the IAT sensor for proper resistance and voltage readings according to manufacturer specifications. Replace the sensor if it is found to be faulty.
  3. Wiring Check: Inspect the wiring harness for any signs of wear, fraying, or damage. Repair or replace any damaged wiring as necessary.
  4. Connector Cleaning: Clean any corroded connectors with electrical contact cleaner to ensure a good electrical connection.
  5. ECM Diagnostics: If the issue persists, perform a diagnostic check on the ECM to rule out any internal faults or software issues that may be affecting the IAT circuit.

Cost to Fix P0114 2018 GMC Sierra

The typical repair costs for addressing a P0114 code can range from $100 to $400, depending on the underlying cause. This estimate includes parts such as a new IAT sensor (which can cost between $20 and $100) and labor costs, which can vary significantly based on location and the specific repair shop. Most auto repair shops charge between $80 and $150 per hour for labor. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer lower rates. It is advisable to check local rates and obtain multiple quotes for a more precise estimate tailored to your specific situation.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0114 2018 GMC Sierra Code

1. What does the OBDII code P0114 mean on a 2018 GMC Sierra?

P0114 indicates an intermittent issue with the Intake Air Temperature (IAT) sensor circuit, meaning the sensor is sending inconsistent or erratic signals to the engine control module (ECM).

2. What are the symptoms of code P0114 in a 2018 GMC Sierra?

Common symptoms include poor fuel efficiency, rough idling, hesitation during acceleration, and in some cases, the check engine light turning on.

3. What causes the P0114 code in a GMC Sierra?

Potential causes include a faulty IAT sensor, damaged wiring or connections to the sensor, a dirty air filter, or a malfunctioning ECM.

4. Can I still drive my 2018 GMC Sierra with a P0114 code?

While the vehicle may remain drivable, ignoring this code can lead to reduced performance and fuel efficiency. It's best to diagnose and fix the issue promptly.

5. How do I troubleshoot the P0114 code?

Start by inspecting the IAT sensor and its wiring for damage or loose connections. Check the air filter for clogs and use a diagnostic tool to monitor the IAT sensor's live data for erratic readings.

6. Where is the IAT sensor located in a 2018 GMC Sierra?

The IAT sensor is usually located on the intake manifold or integrated into the mass airflow (MAF) sensor near the air filter housing.

7. How do I fix the P0114 code on my GMC Sierra?

Repairs may include replacing a faulty IAT sensor, repairing damaged wiring, cleaning or replacing the air filter, or updating/replacing the ECM if necessary.

8. How much does it cost to fix a P0114 code on a 2018 GMC Sierra?

The cost depends on the root cause. Replacing an IAT sensor typically costs $50–$200, while wiring repairs or ECM replacements may vary significantly.

9. Can a dirty air filter cause a P0114 code?

Yes, a clogged or dirty air filter can disrupt airflow to the IAT sensor, causing erratic readings and triggering the code.

10. Do I need to clear the P0114 code after repairs?

Yes, after fixing the issue, use an OBDII scanner to clear the code. Monitor the system to ensure the code does not return.

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