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P22A6 2017 GMC Sierra Code - NOx Sensor 2 Heater Feedback Circuit

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: P22A6 2017 GMC Sierra indicates NOx Sensor 2 Heater Feedback Circuit.
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.

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Code Popularity 147

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 P22A6 2017 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 P22A6 2017 GMC Sierra - NOx Sensor 2 Heater Feedback Circuit - AutoCodes.com — P22A6 2017 GMC Sierra Code - NOx Sensor 2 Heater Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P22A6 2017 GMC Sierra?

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 P22A6 2017 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 P22A6 2017 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 P22A6 2017 GMC Sierra code?

Need more information on how to fix the P22A6 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A6 2017 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 P22A6 2017 GMC Sierra Code

1. What does the OBDII code P22A6 NOx Sensor 2 Heater Feedback Circuit mean?

The code P22A6 indicates a problem with the heater feedback circuit of NOx Sensor 2 in a 2017 GMC Sierra.

2. What are the common symptoms of a P22A6 NOx Sensor 2 Heater Feedback Circuit issue?

Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine light.

3. What are the potential causes of a P22A6 NOx Sensor 2 Heater Feedback Circuit fault in a 2017 GMC Sierra?

Possible causes include a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning ECM (Engine Control Module).

4. How can I diagnose a P22A6 NOx Sensor 2 Heater Feedback Circuit problem in my GMC Sierra?

Diagnosis typically involves using an OBDII scanner to read the code, inspecting the NOx sensor and its connections, and testing the heater circuit for continuity.

5. Can I continue driving my GMC Sierra with a P22A6 NOx Sensor 2 Heater Feedback Circuit fault?

It is not recommended to drive with this issue as it can lead to increased emissions, decreased fuel efficiency, and potential damage to other engine components.

6. How can I repair a P22A6 NOx Sensor 2 Heater Feedback Circuit fault in my 2017 GMC Sierra?

Repair options may include replacing the NOx sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, or reprogramming the ECM.

7. Are there any DIY tips for addressing a P22A6 NOx Sensor 2 Heater Feedback Circuit problem?

While some basic inspections and connector checks can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for accurate diagnosis and repair of this issue.

8. How much can I expect to pay to repair a P22A6 NOx Sensor 2 Heater Feedback Circuit fault in a 2017 GMC Sierra?

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

9. How often does a P22A6 NOx Sensor 2 Heater Feedback Circuit fault occur in a 2017 GMC Sierra?

This fault can occur due to various reasons and is not extremely common, but it is essential to address it promptly to maintain optimal engine performance and emissions.

10. Will resetting the Check Engine light resolve a P22A6 NOx Sensor 2 Heater Feedback Circuit issue in my GMC Sierra?

Resetting the light may temporarily clear the code, but if the underlying problem is not fixed, the Check Engine light is likely to come back on. It is crucial to address the root cause of the fault to prevent further issues.