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P11D5 2015 Chevrolet Silverado Code - NOx Sensor 2 Exceeded Minimum Learning Limit

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: P11D5 2015 Chevrolet Silverado indicates NOx Sensor 2 Exceeded Minimum Learning Limit.
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 512

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 P11D5 2015 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 P11D5 2015 Chevrolet Silverado - NOx Sensor 2 Exceeded Minimum Learning Limit - AutoCodes.com — P11D5 2015 Chevrolet Silverado Code - NOx Sensor 2 Exceeded Minimum Learning Limit

What does this mean?

What are the Possible Causes of the DTC P11D5 2015 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 P11D5 2015 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 P11D5 2015 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 P11D5 2015 Chevrolet Silverado code?

Need more information on how to fix the P11D5 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D5 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 P11D5 2015 Chevrolet Silverado Code

1. What does the OBDII code P11D5 mean on a 2015 Chevrolet Silverado?

P11D5 indicates that the NOx Sensor 2 has exceeded its minimum learning limit, meaning the sensor is detecting values outside of the expected range.

2. What are the symptoms of the P11D5 code on a Chevy Silverado?

Symptoms may include a check engine light, reduced fuel efficiency, decreased engine performance, or the vehicle entering limp mode.

3. What causes the P11D5 code to appear on a 2015 Silverado?

Common causes include a faulty NOx Sensor 2, wiring or connector issues, excessive exhaust soot buildup, or a malfunctioning SCR (Selective Catalytic Reduction) system.

4. Can driving with the P11D5 code damage my Silverado?

Prolonged driving with this code might lead to increased emissions, reduced fuel efficiency, and potential damage to the emissions system if not addressed.

5. How do you diagnose the P11D5 code?

Diagnosis involves scanning for additional codes, inspecting the NOx Sensor 2 and its wiring, checking for soot buildup, and verifying proper operation of the SCR system.

6. How do you fix the P11D5 code on a 2015 Chevrolet Silverado?

Repairs may include replacing the NOx Sensor 2, cleaning the exhaust system, repairing damaged wiring, or reprogramming the engine control module (ECM).

7. How much does it cost to repair the P11D5 code on a Chevy Silverado?

Replacing a NOx sensor typically costs between $300 and $700, including parts and labor, depending on the shop and location.

8. Can a software update resolve the P11D5 code?

In some cases, a software update or ECM reprogramming may correct erroneous sensor readings and resolve the issue.

9. How often do NOx sensors fail on a 2015 Silverado?

NOx sensors can fail due to age, contamination, or excessive soot buildup, typically around 80,000 to 100,000 miles, but this varies by driving conditions.

10. Is the P11D5 code covered under warranty for a 2015 Chevy Silverado?

Emissions-related components, such as NOx sensors, may be covered under the federally mandated emissions warranty, which typically lasts 8 years or 80,000 miles. Check with your dealer for specifics.