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P11D5 2014 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 2014 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 256
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P11D5 2014 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 2014 Chevrolet Silverado - NOx Sensor 2 Exceeded Minimum Learning Limit - AutoCodes.com
P11D5 2014 Chevrolet Silverado Code - NOx Sensor 2 Exceeded Minimum Learning Limit
What does this mean?

What are the Possible Causes of the DTC P11D5 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P11D5 2014 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 2014 Chevrolet Silverado Code

1. What does OBDII code P11D5 mean on a 2014 Chevrolet Silverado?

P11D5 indicates that the NOx sensor 2 (downstream sensor) has exceeded its minimum learning limit, meaning it is providing readings outside the expected range.

2. What are the common symptoms of code P11D5?

Symptoms may include a check engine light, reduced fuel efficiency, increased emissions, and possible activation of limp mode.

3. What causes the P11D5 code to appear?

Common causes include a faulty NOx sensor, wiring issues, exhaust system leaks, or a malfunctioning diesel exhaust fluid (DEF) system.

4. Can a dirty or clogged DEF injector trigger the P11D5 code?

Yes, a clogged DEF injector can affect NOx sensor performance, leading to inaccurate readings and triggering the code.

5. How do I diagnose the P11D5 code on my Silverado?

Diagnosis typically involves scanning for codes, inspecting the NOx sensor and its wiring, checking for exhaust leaks, and testing the DEF system for proper operation.

6. Can I drive my Silverado with the P11D5 code?

While the vehicle may still be drivable, continuing to drive with this code can lead to reduced performance, higher emissions, and potential damage to the emissions system.

7. How do I fix the P11D5 code?

Repairs may include replacing the NOx sensor, repairing damaged wiring, sealing exhaust leaks, or servicing the DEF system.

8. How much does it cost to repair the P11D5 code?

The cost can vary but typically ranges from $300 to $800 depending on whether the NOx sensor needs replacement or if additional repairs are required.

9. Can a software update fix the P11D5 code?

In some cases, a software update from the dealership may recalibrate the system and resolve the code, but only if no hardware issues are present.

10. How can I prevent the P11D5 code from recurring?

Regular maintenance of the DEF system, timely replacement of sensors, and ensuring no exhaust leaks are present can help prevent this code.

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