AutoCodes – Generic – P11C2

P11C2 Code - Intake Air Humidity Sensor Circuit Low 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: P11C2 indicates Intake Air Humidity Sensor Circuit Low 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 21,170

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 29, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P11C2 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 P11C2 - Intake Air Humidity Sensor Circuit Low Voltage - AutoCodes.com — P11C2 Code - Intake Air Humidity Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P11C2?

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 P11C2?

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 P11C2 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 P11C2 code?

Need more information on how to fix the P11C2 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11C2 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P11C2 Chevrolet — Intake Air Humidity Sensor Circuit Low Voltage
P11C2 GMC — Intake Air Humidity Sensor Circuit Low 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 P11C2 Code

1. What are the common symptoms of OBDII code P11C2 (Intake Air Humidity Sensor Circuit Low Voltage)?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling issues.

2. What can cause the OBDII code P11C2 to trigger?

- The code P11C2 is typically triggered by a faulty intake air humidity sensor, damaged wiring or connectors, or a failed PCM (powertrain control module).

3. How can I diagnose the cause of the Intake Air Humidity Sensor Circuit Low Voltage code?

- Diagnosis involves checking the sensor's electrical connections, inspecting the sensor for physical damage, and using a multimeter to test the sensor's voltage output.

4. Can a dirty air filter cause the intake air humidity sensor circuit low voltage error?

- While a dirty air filter can affect engine performance, it is not a direct cause of the P11C2 code. Focus on checking the sensor and related components first.

5. What are the potential dangers of ignoring the P11C2 code?

- Ignoring the code can lead to poor engine performance, reduced fuel efficiency, and potential long-term damage to the engine components.

6. Is it safe to drive with the P11C2 code present in the vehicle's system?

- It is not recommended to drive with the P11C2 code active, as it can lead to further issues and potential engine damage over time.

7. How difficult is it to repair the Intake Air Humidity Sensor Circuit Low Voltage issue?

- The repair difficulty can vary depending on the exact cause of the problem. Replacing a faulty sensor or repairing wiring may require basic mechanical skills and tools.

8. Can I reset the OBDII code P11C2 without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it will likely reappear if the root cause is not addressed. It is crucial to diagnose and fix the problem.

9. Are there any DIY repair tips for resolving the P11C2 code?

- DIY repair tips include checking and cleaning the sensor connections, inspecting for visible damage, and ensuring proper sensor operation before considering a replacement.

10. How much does it typically cost to repair the Intake Air Humidity Sensor Circuit Low Voltage issue?

- The cost can vary based on the exact cause of the problem, but replacing a faulty sensor or repairing wiring may range from $100 to $300 at a repair shop.