AutoCodes – Chevrolet – P11DC 2018 Chevrolet Silverado

P11DC 2018 Chevrolet Silverado Code - NOx Sensor 2 Current Performance

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 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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: P11DC 2018 Chevrolet Silverado indicates NOx Sensor 2 Current Performance.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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 503

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 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11DC 2018 Chevrolet Silverado 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 P11DC 2018 Chevrolet Silverado - NOx Sensor 2 Current Performance - AutoCodes.com — P11DC 2018 Chevrolet Silverado Code - NOx Sensor 2 Current Performance

What does this mean?

What are the Possible Causes of the DTC P11DC 2018 Chevrolet Silverado?

Faulty Nitrogen Oxides (NOx) Sensor 2
Nitrogen Oxides Sensor 2 harness is open or shorted
Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P11DC 2018 Chevrolet Silverado?

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 P11DC 2018 Chevrolet Silverado 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 P11DC 2018 Chevrolet Silverado code?

Need more information on how to fix the P11DC 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P11DC 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P11DC in a 2018 Chevrolet Silverado related to NOx Sensor 2 Current Performance?

- Common symptoms include decreased fuel efficiency, engine hesitation, rough idling, and an illuminated check engine light.

2. What are the potential causes of OBDII code P11DC in a 2018 Chevrolet Silverado?

- Possible causes include a faulty NOx sensor 2, wiring issues, exhaust system leaks, or issues with the Selective Catalytic Reduction (SCR) system.

3. How can I diagnose the OBDII code P11DC in my 2018 Chevrolet Silverado?

- Diagnosis involves using an OBDII scanner to retrieve the trouble code, inspecting the NOx sensor 2 and its wiring for damage, and checking for any exhaust system leaks.

4. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P11DC present?

- It is not recommended to drive with this code present as it can lead to increased emissions, potential engine damage, and may cause the vehicle to fail emissions tests.

5. How can I repair OBDII code P11DC in my 2018 Chevrolet Silverado?

- Repair may involve replacing the faulty NOx sensor 2, repairing any damaged wiring, fixing exhaust system leaks, or addressing issues with the SCR system.

6. Will resetting the check engine light resolve OBDII code P11DC in my 2018 Chevrolet Silverado?

- Resetting the check engine light may temporarily clear the code, but it will likely return if the underlying issue causing the code is not addressed.

7. How much does it cost to repair OBDII code P11DC in a 2018 Chevrolet Silverado?

- Repair costs can vary depending on the exact cause of the code and the labor rates in your area. It is recommended to get a diagnosis from a qualified mechanic for an accurate estimate.

8. Are there any maintenance tips to prevent OBDII code P11DC in a 2018 Chevrolet Silverado?

- Regular maintenance, including keeping up with oil changes, checking the exhaust system for leaks, and ensuring proper functioning of the emission control components, can help prevent this code.

9. Can a DIY enthusiast fix OBDII code P11DC in a 2018 Chevrolet Silverado?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to address issues related to this code, such as replacing the NOx sensor 2 or repairing wiring.

10. Is OBDII code P11DC a common issue in 2018 Chevrolet Silverado vehicles?

- While not as common as some other codes, issues related to NOx sensor 2 performance can occur in 2018 Chevrolet Silverado vehicles, especially if maintenance is neglected.