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P11D8 2015 Chevrolet Silverado Code - O2 Pump Current Control Circuit (NOx Sensor 2)

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: P11D8 2015 Chevrolet Silverado indicates O2 Pump Current Control Circuit (NOx Sensor 2).
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 307

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 P11D8 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 P11D8 2015 Chevrolet Silverado - O2 Pump Current Control Circuit (NOx Sensor 2) - AutoCodes.com — P11D8 2015 Chevrolet Silverado Code - O2 Pump Current Control Circuit (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D8 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 P11D8 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 P11D8 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 P11D8 2015 Chevrolet Silverado code?

Need more information on how to fix the P11D8 2015 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 P11D8 2015 Chevrolet Silverado Code

1. What does OBDII code P11D8 mean on a 2015 Chevrolet Silverado?

P11D8 indicates an issue with the O2 Pump Current Control Circuit related to NOx Sensor 2, which monitors and regulates emissions in the exhaust system.

2. What are the symptoms of code P11D8 on a 2015 Chevrolet Silverado?

Symptoms may include the check engine light turning on, reduced engine performance, poor fuel efficiency, or the vehicle entering limp mode.

3. What causes the P11D8 code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 pump circuit, a defective PCM (Powertrain Control Module), or excessive soot buildup in the exhaust.

4. Can I drive my Silverado with code P11D8?

Itâ€™s not recommended to drive for an extended period with this code active, as it may result in increased emissions and potential damage to the exhaust system.

5. How do I fix the P11D8 code on my 2015 Silverado?

Repairs may include replacing the faulty NOx sensor, repairing or replacing damaged wiring, cleaning exhaust components, or updating/reprogramming the PCM if needed.

6. How can I diagnose code P11D8 on my Silverado?

Use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage or corrosion, and test the NOx sensor and O2 pump circuit for proper operation.

7. How much does it cost to fix code P11D8 on a Silverado?

The cost varies depending on the root cause. A NOx sensor replacement can cost $300â€“$700, while wiring repairs or PCM reprogramming may cost less.

8. What is NOx Sensor 2 in a 2015 Silverado?

NOx Sensor 2 is located downstream in the exhaust system and measures nitrogen oxide levels to ensure proper emissions control.

9. Will clearing the P11D8 code fix the problem?

Clearing the code may turn off the check engine light temporarily, but the issue will likely return if the underlying problem is not addressed.

10. Can a dirty exhaust system cause code P11D8?

Yes, excessive soot or carbon buildup in the exhaust can interfere with the NOx sensorâ€™s function and trigger this code. Cleaning the exhaust system may help in some cases.