AutoCodes – Chevrolet – P11D5 Chevrolet

P11D5 Chevrolet 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 Chevrolet 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 2,577

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

What does this mean?

What are the Possible Causes of the DTC P11D5 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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

Information for Specific Chevrolet Models

P11D5 2014 Chevrolet Silverado — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2015 Chevrolet Silverado — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2016 Chevrolet Silverado — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2017 Chevrolet Silverado — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2018 Chevrolet Silverado — NOx Sensor 2 Exceeded Minimum Learning Limit

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 Chevrolet Code

1. What are the common symptoms of OBDII code P11D5 in a Chevrolet related to NOx Sensor 2?

- Common symptoms include reduced engine performance, increased emissions, and potential illumination of the check engine light.

2. What can cause the NOx Sensor 2 in a Chevrolet to exceed its minimum learning limit?

- Causes may include a faulty NOx sensor, issues with the NOx sensor circuit, exhaust system leaks, or problems with the engine management system.

3. How can I diagnose the OBDII code P11D5 related to the NOx Sensor 2 in my Chevrolet?

- Diagnosing this code typically involves using a diagnostic scanner to read the code, checking the NOx sensor's wiring and connections, and testing the sensor's functionality.

4. Can I drive my Chevrolet with the P11D5 code related to NOx Sensor 2?

- It is not recommended to drive with this code present, as it may lead to increased emissions and potential engine performance issues.

5. What are some repair tips for fixing the NOx Sensor 2 Exceeded Minimum Learning Limit in a Chevrolet?

- Repair tips may include replacing the faulty NOx sensor, repairing any wiring or connection issues, addressing exhaust leaks, or reprogramming the engine control module.

6. Is it possible to reset the P11D5 code related to the NOx Sensor 2 in a Chevrolet without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause to prevent further issues and ensure proper vehicle operation.

7. How much does it typically cost to repair the NOx Sensor 2 Exceeded Minimum Learning Limit code in a Chevrolet?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve parts and labor expenses ranging from $200 to $600 or more.

8. Can a DIY enthusiast replace the NOx Sensor 2 in a Chevrolet to fix the P11D5 code?

- While some experienced DIYers may be able to replace the sensor themselves, it is recommended to consult a professional mechanic for accurate diagnosis and proper installation.

9. Will ignoring the P11D5 code related to NOx Sensor 2 cause further damage to my Chevrolet?

- Ignoring the code could lead to increased emissions, reduced fuel efficiency, or potential long-term damage to the engine or exhaust system.

10. How often should the NOx sensors be inspected and replaced in a Chevrolet to prevent the P11D5 code from recurring?

- It is advisable to follow the manufacturer's recommended maintenance schedule for inspecting and replacing NOx sensors, typically every 50,000 to 100,000 miles.