AutoCodes – Generic – P11C3

P11C3 Code - Intake Air Humidity Sensor Circuit High Voltage

Quick Answer

The Powertrain Control Module (PCM) monitors the Intake Air Humidity Sensor signal. Common causes include Faulty Intake Air Humidity Sensor, Intake Air Humidity Sensor harness is open or shorted, Intake Air Humidity 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: P11C3 indicates Intake Air Humidity Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Intake Air Humidity Sensor, Intake Air Humidity Sensor harness is open or shorted, Intake Air Humidity 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.

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Code Popularity 4,415

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 28, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P11C3 Description

The Powertrain Control Module (PCM) monitors the Intake Air Humidity Sensor signal. The PCM sets the OBDII code when the Intake Air Humidity Sensor is not to factory specifications.

OBDII Code P11C3 - Intake Air Humidity Sensor Circuit High Voltage - AutoCodes.com — P11C3 Code - Intake Air Humidity Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P11C3?

Faulty Intake Air Humidity Sensor
Intake Air Humidity Sensor harness is open or shorted
Intake Air Humidity Sensor circuit poor electrical connection

How to Fix the DTC P11C3?

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.

What does this mean?

Code Tech Notes

The Intake Air Humidity Sensor is part of the 8-Pin Mass Air Flow, Humidity, BARO and Intake Air Temperature 1 and 2 Sensor.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P11C3 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.

Need more information about the P11C3 code?

Need more information on how to fix the P11C3 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C3 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P11C3 Chevrolet — Intake Air Humidity Sensor Circuit High Voltage
P11C3 GMC — Intake Air Humidity Sensor Circuit High Voltage

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 P11C3 Code

1. What are the common symptoms of OBDII code P11C3 (Intake Air Humidity Sensor Circuit High Voltage)?

- Common symptoms may include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What can cause the Intake Air Humidity Sensor Circuit High Voltage code P11C3?

- Possible causes include a faulty intake air humidity sensor, damaged wiring or connectors in the sensor circuit, or a problem with the engine control module.

3. How do I diagnose the cause of OBDII code P11C3?

- Diagnosing the issue may involve using a scan tool to read the code, checking the sensor's resistance values, inspecting wiring for damage, and testing the sensor's voltage output.

4. Can a dirty air filter trigger code P11C3?

- While a dirty air filter can affect engine performance, it is unlikely to directly trigger code P11C3. However, a restricted air filter could indirectly lead to issues with sensor readings.

5. How can I repair OBDII code P11C3 related to the Intake Air Humidity Sensor Circuit?

- Repair options may include replacing the faulty intake air humidity sensor, repairing damaged wiring or connectors, or resetting the engine control module after addressing any underlying issues.

6. Is it safe to continue driving with OBDII code P11C3 present?

- It is generally not recommended to drive with a persistent check engine light, as unresolved issues could lead to further damage or safety concerns. It is advisable to address the problem promptly.

7. Will resetting the OBDII code P11C3 clear the issue permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying problem is not fixed, the code is likely to reappear. It is crucial to diagnose and address the root cause.

8. Can extreme weather conditions affect the Intake Air Humidity Sensor Circuit and trigger code P11C3?

- Yes, extreme humidity levels or exposure to water can potentially damage the sensor or its circuit, leading to a high voltage reading and triggering code P11C3.

9. Are there any preventive measures to avoid OBDII code P11C3 in the future?

- Regular maintenance, such as inspecting and cleaning sensor connections, checking for water ingress, and replacing air filters as needed, can help prevent issues that may trigger code P11C3.

10. How much does it typically cost to repair OBDII code P11C3 related to the Intake Air Humidity Sensor Circuit?

- The cost of repair can vary depending on the specific cause of the issue, the labor rates in your area, and whether you choose to address the problem yourself or seek professional assistance.