AutoCodes – Chevrolet – P11D2 2017 Chevrolet Silverado

P11D2 2017 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 2017 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 231

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 2017 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 2017 Chevrolet Silverado - O2 Signal Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11D2 2017 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D2 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P11D2 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D2 2017 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 2017 Chevrolet Silverado Code

1. What does the OBDII code P11D2 mean on a 2017 Chevrolet Silverado?

P11D2 indicates that the O2 signal circuit for NOx Sensor 2 (downstream NOx sensor) is detecting a high voltage condition, which suggests an issue with the sensor or its circuit.

2. What are the common symptoms of the P11D2 code?

Symptoms include the Check Engine Light illuminating, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

3. What causes the P11D2 code to appear on a 2017 Chevrolet Silverado?

Common causes include a faulty NOx Sensor 2, damaged or corroded wiring in the sensor circuit, a poor electrical connection, or issues with the engine control module (ECM).

4. Can I drive my Silverado with the P11D2 code active?

While the vehicle may still be drivable, ignoring the code can lead to decreased performance or potential damage to the emissions system. Itâ€™s best to address the issue promptly.

5. How do you diagnose the P11D2 code?

Diagnosis typically involves scanning for codes, inspecting the wiring and connectors for damage, testing the NOx sensor 2 for proper operation, and verifying the ECMâ€™s function.

6. How do I fix the P11D2 code on my 2017 Chevrolet Silverado?

Repairs may include replacing the NOx Sensor 2, repairing or replacing damaged wiring or connectors, or reprogramming/updating the ECM if necessary.

7. What is NOx Sensor 2 responsible for in my Silverado?

NOx Sensor 2 measures nitrogen oxide levels in the exhaust after treatment processes to ensure compliance with emissions regulations.

8. How much does it cost to repair the P11D2 code?

Repair costs vary but typically range from $300 to $800, depending on whether the NOx sensor or wiring needs replacement.

9. Can a dirty diesel particulate filter (DPF) cause the P11D2 code?

While not a direct cause, a clogged DPF can increase exhaust backpressure, potentially affecting sensor readings and triggering related codes.

10. How can I prevent the P11D2 code from reoccurring?

Regularly maintain the exhaust and emissions system, ensure proper fuel quality, and address any issues with sensors or wiring promptly to prevent future occurrences.