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P11D8 2016 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 2016 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 267
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P11D8 2016 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 2016 Chevrolet Silverado - O2 Pump Current Control Circuit (NOx Sensor 2) - AutoCodes.com
P11D8 2016 Chevrolet Silverado Code - O2 Pump Current Control Circuit (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11D8 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the P11D8 2016 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 2016 Chevrolet Silverado Code

1. What does OBDII code P11D8 mean on a 2016 Chevrolet Silverado?

P11D8 indicates an issue with the O2 pump current control circuit for NOx Sensor 2, often related to the exhaust aftertreatment system.

2. What are the symptoms of code P11D8 in a 2016 Chevrolet Silverado?

Common symptoms include an illuminated check engine light, decreased fuel efficiency, reduced engine performance, and potential issues with emissions compliance.

3. What causes the P11D8 code to appear?

The most common causes include a faulty NOx Sensor 2, damaged wiring or connectors in the O2 pump circuit, or a malfunctioning exhaust aftertreatment control module.

4. Can a bad NOx sensor cause the P11D8 code?

Yes, a malfunctioning NOx Sensor 2 can fail to regulate the O2 pump current properly, triggering the P11D8 code.

5. How can I diagnose the P11D8 code on my Chevy Silverado?

Start by inspecting the wiring and connectors for damage or corrosion, then test the NOx Sensor 2 and its circuit using a multimeter or diagnostic scan tool.

6. Is it safe to drive with a P11D8 code on a 2016 Silverado?

While it may be drivable, prolonged operation can lead to increased emissions, reduced performance, and potential damage to the exhaust system.

7. How do I fix the P11D8 code on my 2016 Chevrolet Silverado?

Repairs may include replacing NOx Sensor 2, repairing damaged wiring, or reprogramming the control module if necessary.

8. What tools are needed to address the P11D8 code?

You’ll need a diagnostic scan tool, a multimeter, and potentially tools to replace the NOx sensor or repair wiring.

9. Can a software update resolve the P11D8 code?

In some cases, the issue may be resolved with a reprogramming or software update for the exhaust aftertreatment control module.

10. How much does it cost to repair the P11D8 code on a Chevy Silverado?

Costs vary, but replacing a NOx sensor can range from $300 to $700, while wiring repairs or module reprogramming may cost less.

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