AutoCodes.com
Login with Google
AutoCodes – Chevrolet – P11D1 2017 Chevrolet Silverado

P11D1 2017 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 2017 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 221
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P11D1 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 P11D1 2017 Chevrolet Silverado - O2 Signal Circuit Low Voltage (NOx Sensor 2) - AutoCodes.com
P11D1 2017 Chevrolet Silverado Code - O2 Signal Circuit Low Voltage (NOx Sensor 2)
What does this mean?

What are the Possible Causes of the DTC P11D1 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 P11D1 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 P11D1 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 P11D1 2017 Chevrolet Silverado code?

Need more information on how to fix the P11D1 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11D1 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 P11D1 2017 Chevrolet Silverado Code

1. What does the OBDII code P11D1 mean on a 2017 Chevrolet Silverado?

The P11D1 code indicates a low voltage signal in the oxygen (O2) signal circuit of NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of code P11D1 in a 2017 Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, or difficulty passing emissions tests.

3. What causes the P11D1 code to appear?

Possible causes include a faulty NOx Sensor 2, damaged wiring or connectors in the O2 signal circuit, excessive soot accumulation on the sensor, or an issue with the vehicle's engine control module (ECM).

4. Can a dirty NOx sensor cause the P11D1 code?

Yes, soot or debris buildup on NOx Sensor 2 can interfere with its function and lead to the P11D1 code.

5. How do I diagnose the P11D1 code on my Silverado?

Start by inspecting the wiring and connectors for damage or corrosion. If they appear intact, test the NOx Sensor 2 for proper voltage and functionality using a multimeter or scan tool.

6. Is it safe to drive with a P11D1 code active?

While it may be safe to drive short distances, prolonged driving with this code can lead to reduced engine efficiency and potential damage to the emissions system.

7. How do I fix the P11D1 code on a 2017 Chevrolet Silverado?

Repairs may include replacing NOx Sensor 2, repairing or replacing damaged wiring, cleaning the sensor, or updating the ECM software if a programming issue exists.

8. How much does it cost to fix code P11D1 on a Silverado?

The repair cost varies but typically ranges from $200 to $600, depending on whether the NOx sensor needs replacement or if wiring repairs are required.

9. Can a bad ECM cause the P11D1 code to appear?

While rare, a malfunctioning engine control module (ECM) could misinterpret the sensor signals and trigger the P11D1 code.

10. Will replacing NOx Sensor 2 always fix the P11D1 code?

Not always. If wiring, connectors, or the ECM are the root cause, replacing the sensor alone won't resolve the issue. Proper diagnosis is essential.

Discuss the causes and fixes for P11D1 2017 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P11D1 2017 Chevrolet Silverado comments

No comments found for this page.

AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play