AutoCodes – Chevrolet – P11DC 2017 Chevrolet Silverado

P11DC 2017 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 2017 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 535

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 2017 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 2017 Chevrolet Silverado - NOx Sensor 2 Current Performance - AutoCodes.com — P11DC 2017 Chevrolet Silverado Code - NOx Sensor 2 Current Performance

What does this mean?

What are the Possible Causes of the DTC P11DC 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

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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 2017 Chevrolet Silverado Code

1. What does the OBDII code P11DC mean on a 2017 Chevrolet Silverado?

The P11DC code indicates an issue with the performance of NOx Sensor 2, specifically relating to its current output or signal.

2. What are the common symptoms of code P11DC on a 2017 Silverado?

Symptoms may include poor fuel economy, reduced engine performance, illumination of the check engine light, and possible DEF (Diesel Exhaust Fluid) system warnings.

3. What causes the P11DC code to appear on a 2017 Chevy Silverado?

Common causes include a faulty NOx Sensor 2, wiring or connector issues, excessive soot buildup, or problems with the DEF system.

4. Can I drive my 2017 Chevrolet Silverado with the P11DC code active?

Driving with this code is not recommended, as it may lead to reduced performance, higher emissions, and potential damage to the exhaust aftertreatment system.

5. How do I diagnose the P11DC code on my 2017 Silverado?

Diagnosis typically involves scanning for additional codes, visually inspecting the NOx sensor wiring and connectors, testing the sensor's signal, and checking the DEF system for proper operation.

6. How much does it cost to fix the P11DC code on a 2017 Silverado?

Repair costs vary but can range from $300 to $800, depending on whether the NOx sensor needs replacement or if additional repairs are required.

7. Can the P11DC code be caused by a bad DEF injector?

Yes, a malfunctioning DEF injector that fails to properly dose urea into the exhaust can impact NOx sensor readings and trigger this code.

8. How do I reset the P11DC code on my 2017 Silverado after repairs?

The code can be reset using an OBDII scanner after ensuring the issue is resolved, but it may also clear automatically after several drive cycles.

9. What maintenance can help prevent the P11DC code on a 2017 Silverado?

Regularly servicing the DEF system, using high-quality diesel fuel, and cleaning or replacing the NOx sensors as recommended can help prevent this code.

10. Is the NOx Sensor 2 the same as the upstream NOx sensor on a 2017 Silverado?

No, NOx Sensor 2 is typically the downstream sensor located after the Selective Catalytic Reduction (SCR) system, while the upstream sensor is before the SCR system.