AutoCodes – Chevrolet – P11D0 2018 Chevrolet Silverado

P11D0 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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.

Save to My Repairs My Repairs

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

Code Popularity 265

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 P11D0 2018 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 P11D0 2018 Chevrolet Silverado - O2 Signal Circuit (NOx Sensor 2) - AutoCodes.com — P11D0 2018 Chevrolet Silverado Code - O2 Signal Circuit (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D0 2018 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 P11D0 2018 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 P11D0 2018 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 P11D0 2018 Chevrolet Silverado code?

Need more information on how to fix the P11D0 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D0 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2018 Chevrolet Silverado Code

1. What does the OBDII code P11D0 mean on a 2018 Chevrolet Silverado?

P11D0 indicates an issue with the O2 signal circuit for NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of code P11D0 in a 2018 Chevrolet Silverado?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering a limp mode.

3. What causes the P11D0 code to appear in a 2018 Chevrolet Silverado?

Potential causes include a malfunctioning NOx sensor, damaged wiring or connectors in the O2 signal circuit, or a problem with the engine control module (ECM).

4. How do you diagnose the P11D0 code on a 2018 Chevrolet Silverado?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the wiring and connectors for damage, and testing the NOx sensor for proper operation.

5. Can I drive my 2018 Chevrolet Silverado with the P11D0 code?

Driving with this code is not recommended, as it can lead to reduced performance, increased emissions, and potential damage to the exhaust system over time.

6. How do you fix the P11D0 code on a 2018 Chevrolet Silverado?

Repairs may include replacing the faulty NOx sensor, repairing or replacing damaged wiring, or updating/reprogramming the ECM if necessary.

7. How much does it cost to fix the P11D0 code on a 2018 Chevrolet Silverado?

Repair costs can vary, but replacing a NOx sensor typically ranges between $300 and $800, depending on labor and parts pricing.

8. Can a dirty or clogged exhaust system trigger the P11D0 code?

While less common, a clogged exhaust or catalytic converter can contribute to NOx sensor issues, potentially triggering this code.

9. How often do NOx sensors need to be replaced on a 2018 Chevrolet Silverado?

NOx sensors typically last between 50,000 and 100,000 miles, but driving conditions and maintenance can affect their longevity.

10. Is the P11D0 code covered under warranty for a 2018 Chevrolet Silverado?

It depends on the vehicle's warranty. Emissions-related components like NOx sensors may be covered under the emissions warranty. Check with your dealer for details.