AutoCodes – GMC – P11CC GMC

P11CC GMC Code - Nox Sensor 1 Performance Signal Low

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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: P11CC GMC indicates Nox Sensor 1 Performance Signal Low.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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 4,267

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 Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11CC GMC Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P11CC GMC - Nox Sensor 1 Performance Signal Low - AutoCodes.com — P11CC GMC Code - Nox Sensor 1 Performance Signal Low

What does this mean?

What are the Possible Causes of the DTC P11CC GMC?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P11CC GMC?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P11CC GMC 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 P11CC GMC code?

Need more information on how to fix the P11CC GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P11CC 2014 GMC Sierra — Nox Sensor 1 Performance Signal Low
P11CC 2015 GMC Sierra — Nox Sensor 1 Performance Signal Low
P11CC 2016 GMC Sierra — Nox Sensor 1 Performance Signal Low
P11CC 2017 GMC Sierra — Nox Sensor 1 Performance Signal Low
P11CC 2018 GMC Sierra — Nox Sensor 1 Performance Signal Low

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 P11CC GMC Code

1. What are the common symptoms of OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low)?

- Common symptoms include poor engine performance, reduced fuel efficiency, and an illuminated check engine light.

2. What are the possible causes of OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low)?

- The code may be triggered by a faulty NOx sensor, wiring issues, sensor corrosion, or a malfunctioning engine control module.

3. How can I diagnose OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low)?

- Diagnosing involves using an OBDII scanner to retrieve the code, checking the NOx sensor and related wiring for damage or corrosion, and testing the sensor's performance.

4. How can I repair OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low)?

- Repair may involve replacing the faulty NOx sensor, repairing or replacing damaged wiring, cleaning sensor connections, or resetting the engine control module.

5. Can I drive my vehicle with OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low) without causing further damage?

- It is not recommended to drive with this code present, as it can lead to increased emissions, reduced engine performance, and potential damage to other components.

6. How much does it cost to repair OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low)?

- The repair cost can vary depending on the specific issue causing the code, but it may range from $200 to $500 for parts and labor.

7. Can I reset the check engine light after repairing OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low) myself?

- Yes, you can reset the check engine light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

8. How often should I replace the NOx sensor to prevent OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low)?

- NOx sensors typically have a lifespan of around 100,000 miles and should be replaced as part of routine maintenance to prevent performance issues.

9. Will OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low) cause my vehicle to fail emissions testing?

- Yes, this code may cause your vehicle to fail emissions testing, as it indicates a problem with the NOx sensor affecting emissions control.

10. Can a DIY enthusiast repair OBDII code P11CC GMC (Nox Sensor 1 Performance Signal Low) at home?

- While some repairs related to this code can be done at home, diagnosing and repairing NOx sensor issues may require specialized tools and expertise, so it is recommended to consult a professional mechanic.