AutoCodes – Chevrolet – P11DB 2018 Chevrolet Silverado

P11DB 2018 Chevrolet Silverado Code - NOx Sensor Current Performance Bank 1 Sensor 1

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, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P11DB 2018 Chevrolet Silverado indicates NOx Sensor Current Performance Bank 1 Sensor 1.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 865

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 P11DB 2018 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 P11DB 2018 Chevrolet Silverado - NOx Sensor Current Performance Bank 1 Sensor 1 - AutoCodes.com — P11DB 2018 Chevrolet Silverado Code - NOx Sensor Current Performance Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P11DB 2018 Chevrolet Silverado?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P11DB 2018 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 P11DB 2018 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 P11DB 2018 Chevrolet Silverado code?

Need more information on how to fix the P11DB 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P11DB 2018 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 P11DB 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P11DB in a 2018 Chevrolet Silverado?

The common symptoms of OBDII code P11DB (NOx Sensor Current Performance Bank 1 Sensor 1) in a 2018 Chevrolet Silverado may include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does OBDII code P11DB indicate in a 2018 Chevrolet Silverado?

OBDII code P11DB in a 2018 Chevrolet Silverado specifically refers to an issue with the NOx (nitrogen oxide) sensor's current performance on Bank 1 Sensor 1, which is responsible for monitoring and controlling emissions.

3. What are the possible causes of OBDII code P11DB in a 2018 Chevrolet Silverado?

Possible causes of OBDII code P11DB in a 2018 Chevrolet Silverado include a faulty NOx sensor, wiring or connection issues, a failed sensor heater, exhaust leaks, or a problem with the engine's emissions control system.

4. How can I diagnose the OBDII code P11DB in my 2018 Chevrolet Silverado?

Diagnosing OBDII code P11DB in a 2018 Chevrolet Silverado typically involves performing a thorough inspection of the NOx sensor, checking the sensor's wiring and connections, examining the exhaust system for leaks, and using a scan tool to retrieve and interpret the specific error code.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P11DB?

It is not recommended to continue driving your 2018 Chevrolet Silverado with OBDII code P11DB, as the issue may lead to increased emissions, reduced engine efficiency, and potential damage to other emission control components if left unresolved.

6. How can I repair OBDII code P11DB in my 2018 Chevrolet Silverado?

Repairing OBDII code P11DB in a 2018 Chevrolet Silverado may involve replacing the faulty NOx sensor, repairing any damaged wiring or connections, fixing exhaust leaks, resetting the error code, and conducting a test drive to ensure the issue has been resolved.

7. Will resetting the check engine light fix OBDII code P11DB in my 2018 Chevrolet Silverado?

Resetting the check engine light may temporarily turn off the warning indicator, but it will not fix the underlying issue causing OBDII code P11DB in a 2018 Chevrolet Silverado. It is essential to diagnose and address the root cause of the problem.

8. How much does it cost to repair OBDII code P11DB in a 2018 Chevrolet Silverado?

The cost of repairing OBDII code P11DB in a 2018 Chevrolet Silverado can vary depending on the specific cause of the issue, the needed parts, labor rates, and whether you choose to address the problem yourself or seek professional assistance from a mechanic.

9. Can a DIY enthusiast fix OBDII code P11DB in a 2018 Chevrolet Silverado?

Depending on your experience and access to tools, a DIY enthusiast may be able to fix OBDII code P11DB in a 2018 Chevrolet Silverado by following repair guides, utilizing diagnostic tools, and carefully inspecting and replacing components as needed.

10. How often does OBDII code P11DB occur in a 2018 Chevrolet Silverado?

OBDII code P11DB (NOx Sensor Current Performance Bank 1 Sensor 1) is a relatively uncommon issue in a 2018 Chevrolet Silverado, but it can occur due to various factors affecting the NOx sensor's performance and the vehicle's emission control system.