AutoCodes – Chevrolet – P22FA Chevrolet

P22FA Chevrolet 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 Chevrolet 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 980

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P22FA Chevrolet 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 Chevrolet - NOx Sensor 1 Performance Slow Response High To Low - AutoCodes.com — P22FA Chevrolet Code - NOx Sensor 1 Performance Slow Response High To Low

What does this mean?

What are the Possible Causes of the DTC P22FA Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

Need more information on how to fix the P22FA Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22FA Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P22FA 2014 Chevrolet Silverado — NOx Sensor 1 Performance Slow Response High To Low
P22FA 2015 Chevrolet Silverado — NOx Sensor 1 Performance Slow Response High To Low
P22FA 2016 Chevrolet Silverado — NOx Sensor 1 Performance Slow Response High To Low
P22FA 2017 Chevrolet Silverado — NOx Sensor 1 Performance Slow Response High To Low
P22FA 2018 Chevrolet Silverado — NOx Sensor 1 Performance Slow Response High To Low

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 Chevrolet Code

1. What are common symptoms of OBDII code P22FA (NOx Sensor 1 Performance Slow Response High To Low)?

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

2. What can cause the OBDII code P22FA to trigger in a Chevrolet vehicle?

- The code P22FA is typically triggered by a slow response from the NOx Sensor 1, indicating a performance issue in the conversion of nitrogen oxides.

3. How serious is the OBDII code P22FA (NOx Sensor 1 Performance Slow Response High To Low)?

- While the code may not result in immediate vehicle breakdown, it can lead to increased emissions and potential long-term engine damage if left unresolved.

4. What are some DIY repair tips for addressing the P22FA code in a Chevrolet?

- DIY repair tips may include checking for loose connections, inspecting the NOx sensor for damage, and cleaning any debris or buildup in the sensor area.

5. Can driving with the OBDII code P22FA (NOx Sensor 1 Performance Slow Response High To Low) cause further damage to the vehicle?

- Continued driving with the P22FA code may result in decreased engine efficiency, increased emissions, and potential damage to the catalytic converter over time.

6. How can I reset the Check Engine Light after resolving the OBDII code P22FA in my Chevrolet?

- The Check Engine Light can be reset using an OBDII scanner or by disconnecting the car battery for a few minutes to clear the error code.

7. Is it safe to drive my Chevrolet with the OBDII code P22FA present?

- It is generally safe to drive with the P22FA code, but it is recommended to address the underlying issue promptly to prevent any further complications.

8. How much does it typically cost to repair the OBDII code P22FA in a Chevrolet?

- Repair costs for the P22FA code can vary depending on the specific issue and the labor rates of the repair shop, but it may range from $200 to $500 or more.

9. Will the OBDII code P22FA (NOx Sensor 1 Performance Slow Response High To Low) cause my Chevrolet to fail emissions testing?

- Yes, the P22FA code can cause your vehicle to fail emissions testing due to increased emissions resulting from the NOx sensor performance issue.

10. Can I prevent the OBDII code P22FA from recurring in my Chevrolet?

- Regular maintenance, including checking and replacing the NOx sensor as needed, can help prevent the recurrence of the P22FA code in your Chevrolet.