AutoCodes – Chevrolet – P11D1 2016 Chevrolet Silverado

P11D1 2016 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 2016 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.

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Code Popularity 222

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 P11D1 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 P11D1 2016 Chevrolet Silverado - O2 Signal Circuit Low Voltage (NOx Sensor 2) - AutoCodes.com — P11D1 2016 Chevrolet Silverado Code - O2 Signal Circuit Low Voltage (NOx Sensor 2)

What does this mean?

What are the Possible Causes of the DTC P11D1 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 P11D1 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 P11D1 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 P11D1 2016 Chevrolet Silverado code?

Need more information on how to fix the P11D1 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P11D1 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P11D1 in a 2016 Chevrolet Silverado?

The common symptoms of OBDII code P11D1 in a 2016 Chevrolet Silverado include poor engine performance, reduced fuel efficiency, and illuminated Check Engine light.

2. What does the O2 Signal Circuit Low Voltage (NOx Sensor 2) error code P11D1 indicate in a 2016 Chevrolet Silverado?

The P11D1 code indicates that there is low voltage detected in the O2 signal circuit of the NOx sensor 2 in a 2016 Chevrolet Silverado.

3. What are the possible causes of OBDII code P11D1 in a 2016 Chevrolet Silverado?

Possible causes of code P11D1 in a 2016 Chevrolet Silverado include a faulty NOx sensor, wiring issues in the O2 signal circuit, a damaged connector, or a problem with the engine control module.

4. How can I diagnose the O2 signal circuit low voltage issue in a 2016 Chevrolet Silverado?

Diagnosing the O2 signal circuit low voltage issue involves using an OBDII scanner to retrieve the code, inspecting the NOx sensor and its wiring for damage, and testing the sensor's voltage output with a multimeter.

5. Can I continue driving my 2016 Chevrolet Silverado with OBDII code P11D1 active?

It is not recommended to drive your 2016 Chevrolet Silverado with an active P11D1 code, as it can lead to further damage to the emissions system and potentially cause other issues with the vehicle's performance.

6. How do I repair OBDII code P11D1 in my 2016 Chevrolet Silverado?

Repairing code P11D1 involves replacing the faulty NOx sensor, repairing any damaged wiring or connectors in the O2 signal circuit, and clearing the error code with an OBDII scanner.

7. Is it possible to reset the Check Engine light after fixing OBDII code P11D1 in my 2016 Chevrolet Silverado?

Yes, after repairing the issue causing code P11D1 in your 2016 Chevrolet Silverado, you can use an OBDII scanner to reset the Check Engine light and clear the error code from the vehicle's system.

8. How can I prevent OBDII code P11D1 from appearing again in my 2016 Chevrolet Silverado?

To prevent the recurrence of code P11D1 in your 2016 Chevrolet Silverado, it's essential to perform regular maintenance checks, address any wiring issues promptly, and use quality replacement parts when needed.

9. Will ignoring OBDII code P11D1 affect the overall performance of my 2016 Chevrolet Silverado?

Ignoring code P11D1 in your 2016 Chevrolet Silverado can lead to decreased fuel efficiency, poor engine performance, and potential damage to other components of the vehicle's emissions system over time.

10. How long does it typically take to repair OBDII code P11D1 in a 2016 Chevrolet Silverado?

The time needed to repair code P11D1 in a 2016 Chevrolet Silverado can vary depending on the exact cause of the issue, but it typically takes a few hours to diagnose, fix, and clear the error code.