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P11D5 2018 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 2018 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 572

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 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 P11D5 2018 Chevrolet Silverado - NOx Sensor 2 Exceeded Minimum Learning Limit - AutoCodes.com — P11D5 2018 Chevrolet Silverado Code - NOx Sensor 2 Exceeded Minimum Learning Limit

What does this mean?

What are the Possible Causes of the DTC P11D5 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 P11D5 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 P11D5 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 P11D5 2018 Chevrolet Silverado code?

Need more information on how to fix the P11D5 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the 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 P11D5 2018 Chevrolet Silverado Code

1. What does the OBDII code P11D5 mean on a 2018 Chevrolet Silverado?

The code P11D5 indicates that NOx Sensor 2 has exceeded its minimum learning limit, meaning the sensor is reporting data outside of the expected range for proper operation.

2. What are the common symptoms of code P11D5 on a 2018 Chevy Silverado?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, and in some cases, the truck may enter limp mode.

3. What causes code P11D5 on a 2018 Chevrolet Silverado?

Common causes include a faulty NOx Sensor 2, exhaust system leaks, wiring or connector issues, or software inaccuracies in the engine control module (ECM).

4. How do I diagnose code P11D5 on my 2018 Silverado?

Diagnosis involves scanning the ECM for additional codes, inspecting the NOx sensor and its wiring, checking for exhaust leaks, and verifying sensor data readings with a diagnostic tool.

5. Can a bad NOx sensor cause drivability issues in my Silverado?

Yes, a bad NOx sensor can affect engine performance, reduce fuel efficiency, and potentially trigger limp mode to protect the emissions system.

6. Is replacing the NOx Sensor 2 the only solution for code P11D5?

Not always. While sensor replacement is common, the issue could also be due to wiring problems, exhaust leaks, or software updates required for the ECM.

7. How much does it cost to fix code P11D5 on a 2018 Chevrolet Silverado?

The cost varies but typically ranges from $300 to $600 for parts and labor if the NOx sensor needs replacement. Diagnosis or additional repairs may increase the cost.

8. Can I drive my 2018 Silverado with code P11D5 active?

While the truck may remain drivable, it is not recommended to ignore the issue as it can lead to increased emissions, reduced performance, or damage to the emissions system.

9. How can I prevent code P11D5 from occurring again?

Regular maintenance, ensuring clean fuel, and addressing exhaust leaks promptly can help prevent NOx sensor issues. Additionally, adhering to software update schedules may help.

10. Does code P11D5 require a dealership repair, or can a general mechanic fix it?

A general mechanic with the right tools and experience can often fix the issue, but a dealership may be better equipped to handle ECM software updates if needed.