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P11CC Cadillac 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 Cadillac 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 518

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC P11CC Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

1. What are the common symptoms of OBDII code P11CC in a Cadillac related to the Nox Sensor 1 Performance Signal Low?

The common symptoms include a decrease in engine performance, increased fuel consumption, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P11CC in a Cadillac related to the Nox Sensor 1 Performance Signal Low?

The code P11CC can be triggered by issues such as a faulty Nox sensor, damaged wiring or connectors, or a problem with the engine control module.

3. How can I diagnose the OBDII code P11CC in a Cadillac related to the Nox Sensor 1 Performance Signal Low?

Diagnosis involves using an OBDII scanner to retrieve the specific fault code, inspecting the Nox sensor and its connections for damage, and testing the sensor's performance using specialized equipment.

4. Can I drive my Cadillac with the OBDII code P11CC related to the Nox Sensor 1 Performance Signal Low?

It is not recommended to drive your Cadillac with this code present, as it can lead to further engine damage and increased emissions. It is advisable to address the issue promptly.

5. Are there any simple repair tips for fixing OBDII code P11CC in a Cadillac related to the Nox Sensor 1 Performance Signal Low?

Simple repair tips include checking and cleaning the Nox sensor connectors, inspecting for any visible damage, and ensuring proper installation of the sensor.

6. How much does it typically cost to repair OBDII code P11CC related to the Nox Sensor 1 Performance Signal Low in a Cadillac?

The cost of repair can vary depending on the extent of the issue and whether you choose to do the repair yourself or take it to a professional mechanic. Costs may include parts and labor.

7. Will resetting the check engine light resolve the OBDII code P11CC related to the Nox Sensor 1 Performance Signal Low in a Cadillac?

Resetting the check engine light may temporarily turn off the warning indicator, but it will not fix the underlying issue causing the code. It is important to diagnose and address the root cause of the problem.

8. Can a bad catalytic converter cause OBDII code P11CC in a Cadillac related to the Nox Sensor 1 Performance Signal Low?

A failing catalytic converter can sometimes trigger code P11CC, as it may affect the sensor's readings. It is advisable to inspect the converter if other common causes have been ruled out.

9. Is it possible to prevent OBDII code P11CC related to the Nox Sensor 1 Performance Signal Low in a Cadillac?

Regular maintenance, such as keeping the engine well-tuned and monitoring the vehicle's emissions system, can help prevent issues leading to code P11CC. However, some issues may still arise due to wear and tear.

10. How important is it to address OBDII code P11CC related to the Nox Sensor 1 Performance Signal Low in a Cadillac promptly?

It is essential to address this code promptly to prevent further damage to the engine, ensure optimal performance, and reduce harmful emissions from the vehicle. Ignoring the issue can lead to more severe problems down the line.