AutoCodes – Chevrolet – P22FA 2016 Chevrolet Silverado

P22FA 2016 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response High To Low

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: P22FA 2016 Chevrolet Silverado indicates NOx Sensor 1 Performance Slow Response High To Low.
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 211

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 P22FA 2016 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 P22FA 2016 Chevrolet Silverado - NOx Sensor 1 Performance Slow Response High To Low - AutoCodes.com — P22FA 2016 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response High To Low

What does this mean?

What are the Possible Causes of the DTC P22FA 2016 Chevrolet Silverado?

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 P22FA 2016 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 P22FA 2016 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 P22FA 2016 Chevrolet Silverado code?

Need more information on how to fix the P22FA 2016 Chevrolet Silverado 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 P22FA 2016 Chevrolet Silverado Code

What are the common symptoms of OBDII code P22FA on a 2016 Chevrolet Silverado?

- Common symptoms of code P22FA include reduced engine performance, increased fuel consumption, and possible illumination of the check engine light.

What are the possible causes of OBDII code P22FA on a 2016 Chevrolet Silverado?

- Possible causes of code P22FA include a faulty NOx sensor, wiring issues, exhaust system leaks, or a malfunctioning engine control module (ECM).

How can I diagnose the OBDII code P22FA on my 2016 Chevrolet Silverado?

- Diagnosis typically involves using an OBDII scanner to retrieve the fault code, inspecting the NOx sensor and its wiring, checking for exhaust leaks, and testing the ECM for proper operation.

Can I continue driving my 2016 Chevrolet Silverado with OBDII code P22FA?

- It is not recommended to continue driving with code P22FA, as it can lead to further damage to the vehicle and may cause it to fail emissions tests.

What are the repair options for OBDII code P22FA on a 2016 Chevrolet Silverado?

- Repair options may include replacing the NOx sensor, repairing any wiring issues, fixing exhaust leaks, or reprogramming the ECM. It is best to consult a professional mechanic for an accurate diagnosis and repair.

How much does it typically cost to repair OBDII code P22FA on a 2016 Chevrolet Silverado?

- Repair costs for code P22FA can vary depending on the specific issue causing the code. It is advisable to get multiple quotes from different mechanics to ensure a fair price.

Can I clear the OBDII code P22FA on my 2016 Chevrolet Silverado with a simple reset?

- While clearing the code may temporarily turn off the check engine light, it will not fix the underlying issue causing code P22FA. It is important to address the root cause of the problem.

How often does OBDII code P22FA occur in a 2016 Chevrolet Silverado?

- Code P22FA related to NOx sensor performance is not extremely common, but it can occur due to various factors affecting the emissions control system of the vehicle.

What steps can I take to prevent OBDII code P22FA from appearing on my 2016 Chevrolet Silverado?

- To prevent code P22FA, it is essential to perform regular maintenance on your vehicle, including checking the exhaust system, sensors, and wiring for any signs of wear or damage.