AutoCodes – GMC – P11D5 GMC

P11D5 GMC 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 GMC 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,965

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P11D5 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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

Information for Specific GMC Models

P11D5 2014 GMC Sierra — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2015 GMC Sierra — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2016 GMC Sierra — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2017 GMC Sierra — NOx Sensor 2 Exceeded Minimum Learning Limit
P11D5 2018 GMC Sierra — 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 GMC Code

1. What are the common symptoms of OBDII code P11D5 in a GMC vehicle?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the Check Engine light.

2. What does the OBDII code P11D5 GMC (NOx Sensor 2 Exceeded Minimum Learning Limit) indicate?

- This code indicates that the NOx sensor 2 has detected that it has exceeded the minimum learning limit, signaling a potential issue with the sensor's performance.

3. What are some possible causes of OBDII code P11D5 in a GMC related to the NOx sensor 2?

- Possible causes include a faulty NOx sensor, wiring issues, sensor calibration problems, or issues with the exhaust system.

4. How can I diagnose the OBDII code P11D5 GMC related to the NOx sensor 2?

- Diagnosing this code may involve checking the sensor's wiring, inspecting the sensor for physical damage, and performing sensor calibration tests using diagnostic tools.

5. Can I still drive my GMC vehicle with the OBDII code P11D5 present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the vehicle's emissions system and potentially affect engine performance.

6. How can I repair the OBDII code P11D5 GMC related to the NOx sensor 2?

- Repairing this code may involve replacing the NOx sensor 2, repairing any damaged wiring, calibrating the sensor, and clearing the code with a diagnostic tool.

7. Is it possible to reset the OBDII code P11D5 in a GMC without addressing the underlying issue?

- While you can reset the code temporarily, it is essential to address the underlying problem with the NOx sensor 2 to prevent the code from reappearing.

8. Are there any preventive maintenance tips to avoid OBDII code P11D5 in a GMC?

- Regularly servicing the vehicle, using high-quality fuel, and ensuring proper maintenance of the emissions system can help prevent issues with the NOx sensor 2.

9. Can a DIY enthusiast repair the OBDII code P11D5 GMC related to the NOx sensor 2?

- While some may attempt the repair themselves, it is recommended to seek professional help or consult the vehicle's service manual for accurate diagnosis and repair procedures.

10. How long does it typically take to repair OBDII code P11D5 in a GMC?

- The repair time can vary depending on the exact cause of the issue, but it may take anywhere from a few hours to a full day to diagnose and repair the NOx sensor 2 problem triggering the code.