AutoCodes – GMC – P2211 2015 GMC Sierra

P2211 2015 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 2015 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 2015 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 2015 GMC Sierra - NOx Sensor 1 Heater Feedback Circuit Low Voltage - AutoCodes.com — P2211 2015 GMC Sierra Code - NOx Sensor 1 Heater Feedback Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2211 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the P2211 2015 GMC Sierra 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 P2211 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2211 on a 2015 GMC Sierra related to NOx Sensor 1 Heater Feedback Circuit Low Voltage?

The common symptoms include decreased fuel efficiency, engine misfires, and an illuminated check engine light.

2. What can cause the NOx Sensor 1 Heater Feedback Circuit Low Voltage code (P2211) on a 2015 GMC Sierra?

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

3. How serious is the P2211 NOx Sensor 1 Heater Feedback Circuit Low Voltage fault on a 2015 GMC Sierra?

While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the emissions system and ensure optimal engine performance.

4. Can I continue driving my 2015 GMC Sierra with the P2211 code related to the NOx Sensor 1 Heater Feedback Circuit Low Voltage?

It is generally not recommended to drive the vehicle for an extended period with this fault as it may lead to increased emissions and potential damage to the catalytic converter.

5. How is the P2211 OBDII code related to the NOx Sensor 1 Heater Feedback Circuit Low Voltage diagnosed on a 2015 GMC Sierra?

Diagnosis typically involves using a scan tool to retrieve the fault code, testing the NOx sensor and related components, and inspecting the wiring for any faults.

6. What are some repair tips for addressing the P2211 NOx Sensor 1 Heater Feedback Circuit Low Voltage code on a 2015 GMC Sierra?

Repair tips may include checking and replacing the NOx sensor, inspecting and repairing any damaged wiring, ensuring proper connection of the sensor, and resetting the fault code.

7. Can a DIY enthusiast fix the P2211 fault related to the NOx Sensor 1 Heater Feedback Circuit Low Voltage on a 2015 GMC Sierra?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the underlying cause of the fault may require professional expertise and specialized tools.

8. How much does it typically cost to repair the NOx Sensor 1 Heater Feedback Circuit Low Voltage fault (P2211) on a 2015 GMC Sierra?

The repair cost can vary depending on the exact cause of the fault, but it may range from a few hundred to a thousand dollars, including parts and labor.

9. Are there any recalls or technical service bulletins related to the P2211 NOx Sensor 1 Heater Feedback Circuit Low Voltage code on a 2015 GMC Sierra?

It's recommended to check with a GMC dealership or online resources for any recalls or technical service bulletins related to this specific fault code to see if there are any known issues or remedies.

10. How can I prevent or reduce the likelihood of encountering the P2211 fault related to the NOx Sensor 1 Heater Feedback Circuit Low Voltage on my 2015 GMC Sierra?

Regular maintenance, such as checking and replacing sensors as recommended by the manufacturer, monitoring the vehicle's performance, and addressing any warning lights promptly, can help prevent such faults from occurring.