AutoCodes.com
Login with Google
AutoCodes – Chevrolet – P11D2 2015 Chevrolet Silverado

P11D2 2015 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (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
P11D2 2015 Chevrolet Silverado indicates O2 Signal Circuit High Voltage (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 234
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
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P11D2 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 P11D2 2015 Chevrolet Silverado - O2 Signal Circuit High Voltage (NOx Sensor 2) - AutoCodes.com
P11D2 2015 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11D2 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 P11D2 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 P11D2 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 P11D2 2015 Chevrolet Silverado code?

Need more information on how to fix the P11D2 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D2 2015 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 P11D2 2015 Chevrolet Silverado Code

1. What does the OBDII code P11D2 mean on a 2015 Chevrolet Silverado?

P11D2 indicates a high voltage issue in the oxygen (O2) signal circuit for NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of code P11D2 in a 2015 Chevrolet Silverado?

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

3. What causes the P11D2 code to be triggered?

Common causes include a faulty NOx Sensor 2, damaged or shorted wiring in the O2 signal circuit, a malfunctioning exhaust system, or issues with the powertrain control module (PCM).

4. How do I diagnose the P11D2 code on a 2015 Chevrolet Silverado?

Start by scanning the vehicle with an OBDII tool, inspecting the wiring and connectors around NOx Sensor 2, and testing the sensor's voltage output to ensure it is within the expected range.

5. Can a bad NOx Sensor 2 cause the P11D2 code?

Yes, a malfunctioning or damaged NOx Sensor 2 is one of the most common causes of this code and should be inspected or replaced if necessary.

6. Is it safe to drive with the P11D2 code on a 2015 Chevrolet Silverado?

Driving with this code is not recommended, as it may lead to increased emissions, reduced engine performance, and potential damage to other exhaust system components.

7. How do you fix the P11D2 code on a 2015 Chevrolet Silverado?

Repairs may involve replacing NOx Sensor 2, repairing or replacing damaged wiring, or reprogramming the PCM if it is found to be faulty.

8. How much does it cost to fix the P11D2 code on a 2015 Chevrolet Silverado?

The repair cost can vary, but replacing a NOx sensor typically ranges from $300 to $500, including parts and labor. Additional costs may apply if wiring repairs or PCM reprogramming are needed.

9. Can a dirty or clogged exhaust system cause the P11D2 code?

Yes, a clogged exhaust system can contribute to voltage irregularities in the O2 signal circuit, which may trigger this code.

10. Will clearing the P11D2 code with an OBDII scanner fix the problem?

Clearing the code will reset the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.

Discuss the causes and fixes for P11D2 2015 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P11D2 2015 Chevrolet Silverado comments

No comments found for this page.

AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play