AutoCodes – Chevrolet – P11D1 2015 Chevrolet Silverado

P11D1 2015 Chevrolet Silverado Code - O2 Signal Circuit Low 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: P11D1 2015 Chevrolet Silverado indicates O2 Signal Circuit Low 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 223

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 P11D1 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 P11D1 2015 Chevrolet Silverado - O2 Signal Circuit Low Voltage (NOx Sensor 2) - AutoCodes.com — P11D1 2015 Chevrolet Silverado Code - O2 Signal Circuit Low Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D1 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 P11D1 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 P11D1 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 P11D1 2015 Chevrolet Silverado code?

Need more information on how to fix the P11D1 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D1 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 P11D1 2015 Chevrolet Silverado Code

1. What does the OBDII code P11D1 mean on a 2015 Chevrolet Silverado?

P11D1 indicates that the O2 signal circuit for NOx Sensor 2 is detecting a low voltage, which may suggest an issue with the NOx sensor or its wiring.

2. What are the symptoms of a P11D1 code?

Common symptoms include the Check Engine Light turning on, reduced fuel efficiency, increased emissions, and possible engine performance issues.

3. What causes the P11D1 code to appear?

The code can be caused by a faulty NOx Sensor 2, damaged wiring or connectors, excessive soot buildup, or issues with the vehicleâ€™s exhaust system.

4. Where is NOx Sensor 2 located on a 2015 Chevrolet Silverado?

NOx Sensor 2 is typically located downstream in the exhaust system, near or after the diesel particulate filter (DPF).

5. Can a P11D1 code damage my engine if left unaddressed?

While it may not immediately damage the engine, ignoring the issue can lead to reduced engine efficiency, higher emissions, and potential damage to the catalytic converter or DPF over time.

6. How can I diagnose the cause of the P11D1 code?

Begin by inspecting the wiring and connectors for damage or corrosion, checking the NOx Sensor 2 for proper operation, and ruling out exhaust leaks or blockages.

7. Is it safe to drive with a P11D1 code?

Driving with this code may be safe in the short term but can lead to increased emissions and reduced fuel efficiency. Itâ€™s best to address the issue promptly.

8. How do I fix the P11D1 code on my Silverado?

Repairs may include replacing the NOx Sensor 2, repairing damaged wiring or connectors, cleaning soot buildup, or addressing any exhaust system issues.

9. How much does it cost to repair a P11D1 code?

Costs can vary, but replacing a NOx sensor typically ranges from $300 to $600, including parts and labor. Additional repairs may increase the cost.

10. Can a software update fix the P11D1 code?

In some cases, a software update to the engine control module (ECM) may resolve the issue if the problem is related to incorrect sensor calibration. Consult your dealership for guidance.