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P22F9 2017 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response Low To High

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: P22F9 2017 Chevrolet Silverado indicates NOx Sensor 1 Performance Slow Response Low To High.
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 227

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 P22F9 2017 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 P22F9 2017 Chevrolet Silverado - NOx Sensor 1 Performance Slow Response Low To High - AutoCodes.com — P22F9 2017 Chevrolet Silverado Code - NOx Sensor 1 Performance Slow Response Low To High

What does this mean?

What are the Possible Causes of the DTC P22F9 2017 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 P22F9 2017 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 P22F9 2017 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 P22F9 2017 Chevrolet Silverado code?

Need more information on how to fix the P22F9 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22F9 2017 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 P22F9 2017 Chevrolet Silverado Code

1. What does the OBDII code P22F9 mean on a 2017 Chevrolet Silverado?

P22F9 indicates that the NOx Sensor 1 (upstream sensor) is detecting a slow response when transitioning from low to high levels of nitrogen oxide emissions.

2. What are the symptoms of a P22F9 code in a 2017 Chevrolet Silverado?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, and possibly the vehicle entering limp mode.

3. What causes the P22F9 code to appear?

Common causes include a malfunctioning NOx sensor, damaged wiring or connectors, exhaust system issues like leaks, or software-related faults in the engine control module (ECM).

4. Can I drive my 2017 Chevrolet Silverado with a P22F9 code?

While the vehicle may still be drivable, prolonged operation with this code can lead to reduced performance and potentially damage the emissions system.

5. How do I fix the P22F9 code on my Silverado?

Start by inspecting the NOx sensor wiring and connectors for damage. If no issues are found, test the sensor for proper function and replace it if necessary. In some cases, an ECM software update may be required.

6. How much does it cost to repair a P22F9 code?

The cost to repair a P22F9 code can range from $200 to $600, depending on whether the NOx sensor needs replacement or if additional repairs are required.

7. How is the P22F9 code diagnosed?

A mechanic will use an OBDII scanner to confirm the code, inspect the NOx sensor and wiring, and check for exhaust leaks or other related issues.

8. Can a bad NOx sensor cause other problems in my Silverado?

Yes, a faulty NOx sensor can lead to increased emissions, reduced fuel efficiency, and strain on the vehicle's emissions system components.

9. What happens if I ignore the P22F9 code?

Ignoring the code can result in worsening performance, increased emissions, potential damage to the catalytic converter, and failing an emissions test.

10. Is a P22F9 code covered under warranty for a 2017 Chevrolet Silverado?

It may be covered under the emissions system warranty if the vehicle is within the mileage and time limits. Check your warranty details or contact your dealer.