AutoCodes – Chevrolet – P11D2 2014 Chevrolet Silverado

P11D2 2014 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 2014 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.

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Code Popularity 296

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P11D2 2014 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 2014 Chevrolet Silverado - O2 Signal Circuit High Voltage (NOx Sensor 2) - AutoCodes.com — P11D2 2014 Chevrolet Silverado Code - O2 Signal Circuit High Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D2 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P11D2 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2014 Chevrolet Silverado Code

1. What does the OBDII code P11D2 mean for a 2014 Chevrolet Silverado?

P11D2 indicates an issue with the O2 signal circuit high voltage related to NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust.

2. What are common symptoms of the P11D2 code?

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

3. What causes the P11D2 code to appear?

Common causes include a faulty NOx Sensor 2, damaged wiring or connectors, excessive soot buildup on the sensor, or issues with the engine control module (ECM).

4. Can I drive my 2014 Silverado with the P11D2 code?

Driving with this code is not recommended, as it can lead to decreased performance and potential damage to the emissions system.

5. How do I diagnose the cause of the P11D2 code?

Diagnose the issue by inspecting the NOx sensor and its wiring for damage, checking for soot buildup, and using a scan tool to monitor live sensor data.

6. How can I fix the P11D2 code on my Silverado?

Repairs may involve cleaning or replacing the NOx Sensor 2, repairing damaged wiring or connectors, or reprogramming the ECM if necessary.

7. How much does it cost to fix the P11D2 code?

Costs vary but typically range from $300 to $800 depending on whether the sensor, wiring, or ECM needs repair or replacement.

8. What happens if I ignore the P11D2 code?

Ignoring the code can result in reduced engine performance, higher emissions, possible limp mode activation, and damage to other emissions components.

9. Does the P11D2 code always mean the NOx sensor is bad?

No, the issue could also stem from wiring problems, connector issues, or ECM malfunctions rather than a faulty sensor.

10. Can a dirty air filter cause the P11D2 code?

While unlikely, a dirty air filter can indirectly affect exhaust readings by altering the air-fuel mixture, but itâ€™s not a primary cause of this code.