AutoCodes – Chevrolet – P11D2 2016 Chevrolet Silverado

P11D2 2016 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 2016 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 338

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 P11D2 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 P11D2 2016 Chevrolet Silverado - O2 Signal Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11D2 2016 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D2 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 P11D2 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 P11D2 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 P11D2 2016 Chevrolet Silverado code?

Need more information on how to fix the P11D2 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D2 2016 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 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P11D2 in a 2016 Chevrolet Silverado?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What does the O2 signal circuit high voltage (NOx Sensor 2) error code mean on a 2016 Chevrolet Silverado?

- This code indicates that there is a high voltage condition detected in the O2 sensor circuit for the NOx Sensor 2 in the vehicle's exhaust system.

3. What are the possible causes of the P11D2 code in a 2016 Chevrolet Silverado?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the O2 sensor circuit, engine misfires, or issues with the engine control module.

4. How serious is the O2 signal circuit high voltage error in a 2016 Chevrolet Silverado?

- While the vehicle may still be operable with this code, ignoring it can lead to increased emissions, reduced engine efficiency, and potential damage to the catalytic converter over time.

5. Can I continue driving my 2016 Chevrolet Silverado with the P11D2 code present?

- It is generally not recommended to continue driving with this code active, as it can affect the vehicle's performance and emissions output. It's advisable to have the issue diagnosed and repaired promptly.

6. How can I diagnose the O2 signal circuit high voltage issue in my 2016 Chevrolet Silverado?

- Diagnosis typically involves using a scan tool to retrieve the specific fault code, checking the wiring and connectors for damage, and testing the NOx sensor and related components for proper functionality.

7. Is it possible to repair the P11D2 code in a 2016 Chevrolet Silverado myself?

- While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, diagnosing and repairing the root cause of the high voltage issue may require professional assistance due to the complexity of the system.

8. What are some tips for preventing the O2 signal circuit high voltage error in a 2016 Chevrolet Silverado?

- Regular maintenance, such as timely replacement of oxygen sensors and checking the exhaust system for leaks or damage, can help prevent issues that may trigger the P11D2 code.

9. How much does it typically cost to repair the O2 signal circuit high voltage fault in a 2016 Chevrolet Silverado?

- Repair costs can vary depending on the specific cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

10. Will resetting the check engine light make the P11D2 code go away in a 2016 Chevrolet Silverado?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue triggering the P11D2 code is not addressed, the light is likely to come back on after some driving cycles.