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P22A7 2014 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Performance

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: P22A7 2014 Chevrolet Silverado indicates NOx Sensor 2 Heater Feedback Performance.
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 267

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 P22A7 2014 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 P22A7 2014 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Performance - AutoCodes.com — P22A7 2014 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Performance

What does this mean?

What are the Possible Causes of the DTC P22A7 2014 Chevrolet Silverado?

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 P22A7 2014 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 P22A7 2014 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 P22A7 2014 Chevrolet Silverado code?

Need more information on how to fix the P22A7 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A7 2014 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 P22A7 2014 Chevrolet Silverado Code

1. What does the OBDII code P22A7 on a 2014 Chevrolet Silverado indicate?

The code P22A7 indicates a NOx Sensor 2 Heater Feedback Performance issue on a 2014 Chevrolet Silverado.

2. What are the common symptoms of a NOx Sensor 2 Heater Feedback Performance problem?

Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

3. What are the possible causes of the P22A7 code on a 2014 Chevrolet Silverado?

Possible causes include a faulty NOx sensor, issues with the sensor wiring or connectors, or problems with the sensor heater circuit.

4. How can I diagnose a NOx Sensor 2 Heater Feedback Performance issue on my 2014 Chevrolet Silverado?

Diagnosis typically involves using a scan tool to read the OBDII code, inspecting the sensor wiring and connectors, and testing the NOx sensor and its heater circuit.

5. Can I continue driving my Chevrolet Silverado with the P22A7 code?

It is not recommended to drive your vehicle with a P22A7 code as it may lead to further damage and reduced engine performance. It's best to address the issue promptly.

6. Is it possible to repair a NOx Sensor 2 Heater Feedback Performance problem at home?

While some DIY enthusiasts may attempt to replace the NOx sensor or repair wiring issues, it is recommended to have a professional technician diagnose and repair the problem properly.

7. How much does it typically cost to fix a NOx Sensor 2 Heater Feedback Performance issue on a 2014 Chevrolet Silverado?

The cost of repairs can vary depending on the exact cause of the issue, but it may range from $200 to $500 or more, including parts and labor.

8. Can a NOx Sensor 2 Heater Feedback Performance problem affect the vehicle's emissions?

Yes, a malfunctioning NOx sensor can impact the vehicle's emissions, potentially leading to higher emissions levels and environmental harm.

9. How often should the NOx sensors be inspected in a 2014 Chevrolet Silverado?

It is recommended to follow the manufacturer's maintenance schedule, which typically includes inspecting the NOx sensors during regular service intervals or when experiencing related symptoms.

10. Will resetting the check engine light resolve the P22A7 code temporarily?

Resetting the check engine light may temporarily turn off the warning indicator, but if the underlying issue causing the P22A7 code is not addressed, the light is likely to come back on.