AutoCodes – GMC – P22FA 2016 GMC Sierra

P22FA 2016 GMC Sierra 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 GMC Sierra 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 143

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

What does this mean?

What are the Possible Causes of the DTC P22FA 2016 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 P22FA 2016 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 P22FA 2016 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 P22FA 2016 GMC Sierra 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 GMC Sierra Code

1. What are the common symptoms of OBDII code P22FA in a 2016 GMC Sierra related to 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 are the possible causes of OBDII code P22FA in a 2016 GMC Sierra?

- The code P22FA can be triggered by issues such as a faulty NOx sensor, wiring problems, exhaust system leaks, or a malfunctioning engine control module.

3. How can I diagnose the NOx Sensor 1 Performance Slow Response High To Low issue in my 2016 GMC Sierra?

- Diagnosis involves using an OBDII scanner to retrieve the specific trouble code, checking the NOx sensor's wiring and connections, and inspecting the exhaust system for leaks.

4. Can I continue driving my 2016 GMC Sierra with the P22FA code related to NOx Sensor 1 Performance Slow Response High To Low?

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

5. How can I repair the NOx Sensor 1 Performance Slow Response High To Low problem in my 2016 GMC Sierra?

- Repair options may include replacing the NOx sensor, repairing any damaged wiring, fixing exhaust leaks, or reprogramming the engine control module.

6. Is it possible to reset the OBDII code P22FA related to NOx Sensor 1 Performance Slow Response High To Low in a 2016 GMC Sierra?

- Simply resetting the code may temporarily turn off the check engine light, but the underlying issue causing the code will need to be addressed to prevent it from reoccurring.

7. Are there any DIY tips for troubleshooting the NOx Sensor 1 Performance Slow Response High To Low error in my 2016 GMC Sierra?

- DIY tips include checking the sensor's connections, visually inspecting the wiring for damage, and ensuring the exhaust system is free from leaks or obstructions.

8. How much does it typically cost to repair OBDII code P22FA in a 2016 GMC Sierra related to NOx Sensor 1 Performance Slow Response High To Low?

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

9. Can a faulty NOx sensor trigger other OBDII trouble codes in a 2016 GMC Sierra?

- Yes, a malfunctioning NOx sensor can sometimes trigger related trouble codes such as P2200 (NOx Sensor Circ Range/Perf) or P2201 (NOx Sensor Circ Range/Perf - Bank 1).

10. How often should the NOx sensor be inspected or replaced in a 2016 GMC Sierra to prevent issues like P22FA?

- It is recommended to follow the manufacturer's maintenance schedule for sensor inspections and replacements, typically every 50,000 to 100,000 miles, to prevent issues like NOx Sensor 1 Performance Slow Response High To Low.