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P22A9 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit Low Voltage

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 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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
P22A9 2016 Chevrolet Silverado indicates NOx Sensor 2 Heater Feedback Circuit Low Voltage.
Common causes
Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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 208
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P22A9 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 P22A9 2016 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Circuit Low Voltage - AutoCodes.com
P22A9 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit Low Voltage
What does this mean?

What are the Possible Causes of the DTC P22A9 2016 Chevrolet Silverado?

  • Faulty Nitrogen Oxides (NOx) Sensor 2
  • Nitrogen Oxides Sensor 2 harness is open or shorted
  • Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P22A9 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 P22A9 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 P22A9 2016 Chevrolet Silverado code?

Need more information on how to fix the P22A9 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 P22A9 2016 Chevrolet Silverado Code

1. What does the OBDII code P22A9 mean for a 2016 Chevrolet Silverado?

The P22A9 code indicates a problem with the NOx Sensor 2 Heater Feedback Circuit experiencing low voltage, which may affect emissions monitoring.

2. What are the common symptoms of code P22A9 in a 2016 Chevrolet Silverado?

Symptoms may include the check engine light turning on, reduced fuel efficiency, and potential issues with engine performance or emissions compliance.

3. What causes the P22A9 code in a 2016 Chevrolet Silverado?

Common causes include a faulty NOx sensor, damaged wiring or connectors, a blown fuse, or issues with the vehicle’s ECM.

4. Can driving with code P22A9 damage my 2016 Silverado?

While it may not cause immediate damage, prolonged driving with this code can affect emissions and potentially lead to other engine performance issues.

5. How do I diagnose the P22A9 code on my 2016 Chevrolet Silverado?

Use an OBDII scanner to confirm the code, and inspect the NOx sensor, wiring, and connectors for damage, corrosion, or loose connections.

6. How is code P22A9 fixed on a 2016 Chevrolet Silverado?

Repairs may involve replacing the NOx sensor, repairing or replacing damaged wiring, or reprogramming the ECM.

7. How much does it cost to repair code P22A9 on a 2016 Chevrolet Silverado?

Costs can vary, but replacing a NOx sensor typically ranges from $300 to $700, depending on labor and parts.

8. Can a faulty NOx sensor cause other problems in my 2016 Silverado?

Yes, a malfunctioning NOx sensor can affect emissions control, fuel efficiency, and overall engine performance.

9. Is code P22A9 covered under warranty for a 2016 Chevrolet Silverado?

It may be covered under the emissions warranty, depending on the mileage and warranty terms. Check with your dealership for details.

10. Can I clear the P22A9 code without fixing the issue?

You can clear the code temporarily with an OBDII scanner, but it will likely return if the underlying problem isn’t addressed.

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