AutoCodes – GMC – P2211 2018 GMC Sierra

P2211 2018 GMC Sierra Code - NOx Sensor 1 Heater Feedback Circuit Low Voltage

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: P2211 2018 GMC Sierra indicates NOx Sensor 1 Heater Feedback Circuit Low Voltage.
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 181

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
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Code P2211 2018 GMC Sierra 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 P2211 2018 GMC Sierra - NOx Sensor 1 Heater Feedback Circuit Low Voltage - AutoCodes.com — P2211 2018 GMC Sierra Code - NOx Sensor 1 Heater Feedback Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2211 2018 GMC Sierra?

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 P2211 2018 GMC Sierra?

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 P2211 2018 GMC Sierra 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 P2211 2018 GMC Sierra code?

Need more information on how to fix the P2211 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2211 2018 GMC Sierra 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 P2211 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2211 on a 2018 GMC Sierra related to NOx Sensor 1 Heater Feedback Circuit Low Voltage?

The common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P2211 on a 2018 GMC Sierra indicating an issue with the NOx Sensor 1 Heater Feedback Circuit?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning NOx sensor heater.

3. How can I diagnose the NOx Sensor 1 Heater Feedback Circuit Low Voltage issue on my 2018 GMC Sierra?

Diagnosis involves using a scan tool to retrieve the specific trouble code, inspecting the wiring and connectors for any damage, and testing the NOx sensor and its heater for proper functionality.

4. Can I continue driving my 2018 GMC Sierra with the P2211 OBDII code related to NOx Sensor 1 Heater Feedback Circuit Low Voltage?

It is not recommended to drive the vehicle with this code as it can lead to increased emissions, reduced engine efficiency, and potential long-term damage if left unaddressed.

5. How can I repair the NOx Sensor 1 Heater Feedback Circuit Low Voltage issue on my 2018 GMC Sierra?

Repair options may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, or addressing any issues with the NOx sensor heater to resolve the low voltage feedback circuit problem.

6. Is it possible to reset the OBDII code P2211 on a 2018 GMC Sierra after repairing the NOx Sensor 1 Heater Feedback Circuit Low Voltage issue?

Yes, the code can be cleared using an OBDII scan tool after the repair has been completed to reset the Check Engine Light and monitor the system for any recurring issues.

7. Can a DIY enthusiast fix the NOx Sensor 1 Heater Feedback Circuit Low Voltage problem on a 2018 GMC Sierra?

While some basic troubleshooting steps can be performed by a DIY enthusiast, complex repairs or component replacements related to the NOx sensor and its heater may require professional assistance.

8. How important is the NOx sensor in the emissions control system of a 2018 GMC Sierra?

The NOx sensor plays a crucial role in monitoring and controlling nitrogen oxide emissions from the vehicle's exhaust system, helping to ensure compliance with emission regulations and optimal engine performance.

9. Are there any recalls or technical service bulletins related to the OBDII code P2211 NOx Sensor 1 Heater Feedback Circuit Low Voltage on a 2018 GMC Sierra?

It is recommended to check with a GMC dealership or the manufacturer's website for any recalls or technical service bulletins specific to this issue, as they may provide relevant information or solutions.

10. How can regular maintenance help prevent issues with the NOx Sensor 1 Heater Feedback Circuit on a 2018 GMC Sierra?

Regular maintenance, including scheduled inspections and servicing of the emissions control system, can help identify potential issues early and prevent problems with components like the NOx sensor and its heater from occurring.