Engine-Codes.com
Engine-Codes – Honda – P1112 Honda

P1112 Honda Code - Intake Air Temperature Sensor Circuit Intermittent Low Voltage

Quick Answer

The P1112 Honda code indicates a problem with the Intake Air Temperature (IAT) Sensor Circuit, specifically intermittent low voltage. Common causes include Faulty IAT Sensor: The sensor itself may be malfunctioning, providing incorrect voltage readings intermittently, Damaged Wiring: Wiring harnesses or connectors in the IAT sensor circuit may be damaged or corroded, leading to intermittent voltage issues, ECM Malfunction: A problem with the Engine Control Module (ECM) could also be causing intermittent low voltage from the IAT sensor. 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
P1112 Honda indicates Intake Air Temperature Sensor Circuit Intermittent Low Voltage.
Common causes
Common causes include Faulty IAT Sensor: The sensor itself may be malfunctioning, providing incorrect voltage readings intermittently, Damaged Wiring: Wiring harnesses or connectors in the IAT sensor circuit may be damaged or corroded, leading to intermittent voltage issues, ECM Malfunction: A problem with the Engine Control Module (ECM) could also be causing intermittent low voltage from the IAT sensor.
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 Sep 08, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1112 Honda Description

The P1112 Honda code indicates a problem with the Intake Air Temperature (IAT) Sensor Circuit, specifically intermittent low voltage. The IAT sensor is a crucial component of the engine management system, responsible for measuring the temperature of the incoming air. This information is used by the Engine Control Module (ECM) to adjust fuel delivery and ignition timing for optimal performance and efficiency.

OBDII Code P1112 Honda - Intake Air Temperature Sensor Circuit Intermittent Low Voltage
P1112 Honda Code - Intake Air Temperature Sensor Circuit Intermittent Low Voltage

Common Causes of P1112 Honda

  1. Faulty IAT Sensor: The sensor itself may be malfunctioning, providing incorrect voltage readings intermittently.
  2. Damaged Wiring: Wiring harnesses or connectors in the IAT sensor circuit may be damaged or corroded, leading to intermittent voltage issues.
  3. ECM Malfunction: A problem with the Engine Control Module (ECM) could also be causing intermittent low voltage from the IAT sensor.
  4. Environmental Factors: Exposure to heat, moisture, or vibration can degrade the sensor or wiring over time, leading to intermittent issues.

Symptoms of P1112 Honda

  1. Check Engine Light: The most obvious symptom of this code is the illumination of the Check Engine Light on the dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning IAT sensor can lead to incorrect fuel adjustments, resulting in decreased fuel efficiency.
  3. Rough Idling: Incorrect air temperature readings can cause the engine to idle erratically or rough.
  4. Engine Stalling: In severe cases, the engine may stall while driving, especially during acceleration or deceleration.
  5. Lack of Power: The vehicle may exhibit a lack of power or sluggish acceleration due to incorrect air/fuel mixture.

How to Fix P1112 Honda

  1. Diagnostic Scan: Use a diagnostic scan tool to read the code and confirm the issue with the IAT sensor circuit.
  2. Inspect Wiring: Check the wiring harness and connectors for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test IAT Sensor: Test the IAT sensor for proper resistance and voltage readings. Replace if found to be faulty.
  4. Clear Codes: Clear the fault codes from the ECM memory after repairing the issue.
  5. Test Drive: Take the vehicle for a test drive to ensure that the symptoms have been resolved and the Check Engine Light does not reappear.

Cost to Fix P1112 Honda

The typical repair costs for addressing a P1112 Honda code can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty IAT sensor can range from $50 to $150, while the cost of repairing damaged wiring or connectors may vary based on the extent of the damage. Labor costs at auto repair shops typically range from $80 to $150 per hour, with additional charges for diagnostic time and parts. It's advisable to check with local repair shops for a more precise estimate based on your location, vehicle make and model, and the severity of the issue.

Need more information about the P1112 Honda code?

Need more information on how to fix the P1112 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1112 Honda code diagnosed by a professional: Find a repair shop in your area

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 P1112 Honda Code

What does the OBDII code P1112 mean on a Honda?

Code P1112 indicates an intermittent low voltage signal in the intake air temperature (IAT) sensor circuit, which helps the engine control module (ECM) monitor and adjust air-fuel ratios based on intake air temperature.

What are the common symptoms of a P1112 code on a Honda?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, difficulty starting, or irregular engine idle.

What causes the P1112 code to appear on a Honda?

The code is often caused by a faulty IAT sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning ECM.

Can I drive my Honda with a P1112 code?

While it may be possible to drive with this code, it is not recommended, as it can result in poor performance, reduced fuel efficiency, and potential damage to the engine over time.

How do I diagnose the P1112 code on my Honda?

Start by inspecting the IAT sensor and its wiring for damage or loose connections. Use a multimeter to test the sensor’s resistance and voltage, and check for continuity in the circuit.

How can I fix the P1112 code on a Honda?

Repairs may include replacing the IAT sensor, repairing or replacing damaged wiring, cleaning corroded connections, or, in rare cases, replacing the ECM if it’s faulty.

How much does it cost to fix the P1112 code on a Honda?

Costs vary depending on the issue, but replacing an IAT sensor typically costs $50–$150 for parts and labor, while wiring repairs or ECM replacement may cost more.

Can a dirty air filter cause the P1112 code on a Honda?

While a dirty air filter does not directly cause this code, it can contribute to airflow issues that may affect sensor readings. Replacing the air filter is a good maintenance step.

Will clearing the P1112 code solve the issue?

Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.

Is the P1112 code specific to Honda vehicles?

No, the P1112 code can appear on other vehicle makes, but its definition and diagnostics may vary. Always consult your vehicle’s repair manual for manufacturer-specific details.

Discuss the causes and fixes for P1112 Honda OBDII Code

Submit a New Comment

Code P1112 Honda comments

No comments found for this page.