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AutoCodes – Generic – P11CC

P11CC 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 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 23,857
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 29, 2024
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Code P11CC 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 - Nox Sensor 1 Performance Signal Low - AutoCodes.com
P11CC Code - Nox Sensor 1 Performance Signal Low
What does this mean?

What are the Possible Causes of the DTC P11CC?

  • 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?

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 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 code?

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

Need Help with the Code?

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Information for Specific Makes

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 Code

1. What does OBDII code P11CC mean?

P11CC indicates that the performance signal from Nitrogen Oxide (NOx) Sensor 1 is reading lower than expected, potentially affecting emissions control.

2. What are the common symptoms of code P11CC?

Symptoms may include reduced fuel efficiency, a check engine light, poor engine performance, and increased emissions.

3. What causes the P11CC code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine control module (ECM).

4. How does a NOx sensor failure lead to the P11CC code?

If the NOx sensor fails or sends inaccurate data, the ECM cannot properly monitor and control nitrogen oxide levels, triggering the code.

5. Can a dirty or clogged exhaust system cause the P11CC code?

Yes, a clogged catalytic converter or exhaust obstruction can disrupt NOx sensor readings and cause this code to appear.

6. How do you diagnose the P11CC code?

Diagnosis involves scanning for additional codes, inspecting the NOx sensor and wiring, checking for exhaust leaks, and testing the sensor’s functionality with a multimeter or scan tool.

7. Can driving with the P11CC code damage my vehicle?

Driving with this code may not cause immediate damage but can lead to poor fuel economy, increased emissions, and potential long-term harm to the catalytic converter.

8. How do you fix the P11CC code?

Repairs may include replacing the NOx sensor, repairing damaged wiring, fixing exhaust leaks, or updating/reprogramming the ECM.

9. How much does it cost to fix code P11CC?

Costs vary, but replacing a NOx sensor typically ranges from $200 to $500, depending on parts and labor.

10. Can a software update resolve the P11CC code?

In some cases, an ECM software update from the manufacturer can address issues with NOx sensor performance if the problem is software-related.

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