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AutoCodes – Chevrolet – P22FA 2015 Chevrolet Silverado

P22FA 2015 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 2015 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 252
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P22FA 2015 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 2015 Chevrolet Silverado - NOx Sensor 1 Performance Slow Response High To Low - AutoCodes.com
P22FA 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P22FA 2015 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 2015 Chevrolet Silverado Code

1. What does the OBDII code P22FA mean on a 2015 Chevrolet Silverado?

The P22FA code indicates a performance issue with the NOx Sensor 1, specifically a slow response when transitioning from high to low nitrogen oxide levels.

2. What are the symptoms of the P22FA code in a 2015 Chevrolet Silverado?

Common symptoms include reduced fuel efficiency, increased emissions, an illuminated check engine light, and potential engine performance issues.

3. What causes the P22FA code in a 2015 Chevrolet Silverado?

Causes may include a faulty NOx Sensor 1, wiring or connector issues, exhaust leaks, or contamination affecting the sensor’s response time.

4. Can I drive my 2015 Chevrolet Silverado with a P22FA code?

While the vehicle may still be drivable, prolonged operation with this code can lead to increased emissions and potential damage to the exhaust aftertreatment system.

5. How do I diagnose the P22FA code?

Diagnose the code by using an OBDII scanner, inspecting the NOx Sensor 1 and its wiring, checking for exhaust leaks, and performing live data analysis to assess sensor response times.

6. How do I fix the P22FA code on a 2015 Chevrolet Silverado?

Repairs may include replacing the NOx Sensor 1, fixing damaged wiring or connectors, repairing exhaust leaks, or updating the vehicle’s ECU software if necessary.

7. How much does it cost to fix the P22FA code?

The cost to repair the P22FA code varies, typically ranging from $200 to $600, depending on whether the NOx sensor needs replacement or if additional issues, such as wiring repairs, are involved.

8. What is a NOx sensor, and why is it important?

A NOx sensor measures nitrogen oxide levels in the exhaust to help control emissions and ensure proper operation of the emissions system.

9. Can a dirty or clogged exhaust system cause the P22FA code?

Yes, a clogged exhaust system or contamination near the sensor can affect the NOx sensor’s performance and trigger this code.

10. Is it necessary to reprogram the ECU after replacing the NOx sensor for a P22FA code?

In some cases, reprogramming or resetting the ECU may be required to ensure proper operation of the new sensor and clear the code.

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