AutoCodes – Chevrolet – P11D0 Chevrolet

P11D0 Chevrolet Code - O2 Signal 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: P11D0 Chevrolet indicates O2 Signal 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 1,023

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 P11D0 Chevrolet 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 P11D0 Chevrolet - O2 Signal Circuit (NOx Sensor 2) - AutoCodes.com — P11D0 Chevrolet Code - O2 Signal Circuit (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D0 Chevrolet?

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 P11D0 Chevrolet?

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 P11D0 Chevrolet 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 P11D0 Chevrolet code?

Need more information on how to fix the P11D0 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D0 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P11D0 2014 Chevrolet Silverado — O2 Signal Circuit (NOx Sensor 2)
P11D0 2015 Chevrolet Silverado — O2 Signal Circuit (NOx Sensor 2)
P11D0 2016 Chevrolet Silverado — O2 Signal Circuit (NOx Sensor 2)
P11D0 2017 Chevrolet Silverado — O2 Signal Circuit (NOx Sensor 2)
P11D0 2018 Chevrolet Silverado — O2 Signal Circuit (NOx Sensor 2)

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 P11D0 Chevrolet Code

1. What are the common symptoms of OBDII code P11D0 in a Chevrolet related to the O2 Signal Circuit (NOx Sensor 2)?

Symptoms may include reduced engine performance, decreased fuel efficiency, rough idling, and potential illumination of the check engine light.

2. What can cause the OBDII code P11D0 in a Chevrolet related to the O2 Signal Circuit (NOx Sensor 2)?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the O2 signal circuit, issues with the engine control module (ECM), or a malfunctioning catalytic converter.

3. How can I diagnose the O2 Signal Circuit issue causing OBDII code P11D0 in my Chevrolet?

Diagnosing the problem may involve using a scan tool to check for the specific error code, inspecting the NOx sensor and its connections, and testing the wiring for any faults or breaks.

4. Are there any DIY repair tips for addressing the OBDII code P11D0 related to the O2 Signal Circuit in a Chevrolet?

DIY repairs may involve checking and cleaning the sensor connections, replacing damaged wiring, or resetting the ECM to see if the code clears before seeking professional assistance.

5. Can driving with the OBDII code P11D0 in a Chevrolet related to the O2 Signal Circuit (NOx Sensor 2) cause further damage?

Continuing to drive with this code unresolved may lead to decreased engine efficiency, potential harm to the catalytic converter, and further damage to engine components over time.

6. What is the typical cost to repair the O2 Signal Circuit issue causing OBDII code P11D0 in a Chevrolet?

Repair costs can vary depending on the exact cause of the issue, but they may range from $200 to $600 for parts and labor, with additional costs if the NOx sensor or catalytic converter needs replacement.

7. How urgent is it to address the OBDII code P11D0 related to the O2 Signal Circuit in a Chevrolet?

It is recommended to address this issue promptly to prevent potential damage to the engine or emissions system, as well as to ensure optimal vehicle performance and fuel efficiency.

8. Can I clear the OBDII code P11D0 in my Chevrolet related to the O2 Signal Circuit without repairing the underlying issue?

Clearing the code without addressing the root cause will only temporarily reset the check engine light, as the issue causing the code will persist and likely trigger the light again.

9. Is it safe to drive my Chevrolet with the check engine light on due to the OBDII code P11D0 related to the O2 Signal Circuit (NOx Sensor 2)?

While it may be safe to drive in the short term, it is advisable to address the underlying issue promptly to prevent potential long-term damage and maintain optimal vehicle performance.

10. How long does it typically take to repair the O2 Signal Circuit issue causing OBDII code P11D0 in a Chevrolet?

The repair time can vary based on the specific cause of the issue and the availability of parts, but it may take anywhere from a few hours to a full day for diagnosis and repair.