AutoCodes – GMC – P2211 2016 GMC Sierra

P2211 2016 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 2016 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 167

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 2016 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 2016 GMC Sierra - NOx Sensor 1 Heater Feedback Circuit Low Voltage - AutoCodes.com — P2211 2016 GMC Sierra Code - NOx Sensor 1 Heater Feedback Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2211 2016 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 2016 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 2016 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 2016 GMC Sierra 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 P2211 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2211 on a 2016 GMC Sierra related to the NOx Sensor 1 Heater Feedback Circuit Low Voltage?

- Common symptoms include poor engine performance, reduced fuel efficiency, illuminated check engine light, and potential emissions issues.

2. What are the possible causes of OBDII code P2211 on a 2016 GMC Sierra?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, a defective heater element in the sensor, or issues with the vehicle's powertrain control module.

3. How can I diagnose the NOx Sensor 1 Heater Feedback Circuit Low Voltage issue on my 2016 GMC Sierra?

- Diagnosing this issue typically involves using an OBDII scanner to read and interpret the code, conducting visual inspections of the sensor and related components, and performing electrical tests to pinpoint the exact cause.

4. Can I continue driving my 2016 GMC Sierra with OBDII code P2211 active?

- It is not recommended to continue driving with this code active, as it can lead to further damage to the vehicle and may cause increased emissions. It is best to address the issue promptly.

5. How can I repair OBDII code P2211 on my 2016 GMC Sierra?

- Repairing this code may involve replacing the NOx sensor, repairing damaged wiring or connectors, checking and possibly replacing the heater element, or resetting the powertrain control module.

6. Is it possible to reset the OBDII code P2211 on a 2016 GMC Sierra without making any repairs?

- While clearing the code using an OBDII scanner may temporarily turn off the check engine light, the underlying issue causing the code will persist unless properly addressed.

7. Can a DIY enthusiast fix the NOx Sensor 1 Heater Feedback Circuit Low Voltage issue on a 2016 GMC Sierra?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to address this issue by following repair guides or tutorials. However, complex electrical issues may require professional expertise.

8. How much does it typically cost to repair OBDII code P2211 on a 2016 GMC Sierra at a mechanic or dealership?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $600 or more, including parts and labor.

9. Will fixing OBDII code P2211 on a 2016 GMC Sierra improve the vehicle's performance and fuel efficiency?

- Yes, addressing this code should help restore proper engine performance, fuel efficiency, and emissions compliance, ensuring the vehicle operates optimally.

10. How often does the NOx Sensor 1 Heater Feedback Circuit Low Voltage issue occur in 2016 GMC Sierra vehicles?

- While not extremely common, this issue can occur in 2016 GMC Sierra vehicles due to various factors like sensor wear, electrical faults, or environmental conditions. Regular maintenance can help prevent such issues.