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P22A6 2014 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit

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
P22A6 2014 Chevrolet Silverado indicates NOx Sensor 2 Heater Feedback Circuit.
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 361
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 P22A6 2014 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 P22A6 2014 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Circuit - AutoCodes.com
P22A6 2014 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit
What does this mean?

What are the Possible Causes of the DTC P22A6 2014 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 P22A6 2014 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 P22A6 2014 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 P22A6 2014 Chevrolet Silverado code?

Need more information on how to fix the P22A6 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A6 2014 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 P22A6 2014 Chevrolet Silverado Code

1. What does the OBDII code P22A6 mean on a 2014 Chevrolet Silverado?

P22A6 indicates an issue with the NOx Sensor 2 Heater Feedback Circuit, which monitors the heater performance of the downstream NOx sensor.

2. What are the symptoms of code P22A6 on a 2014 Chevrolet Silverado?

Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

3. What causes the P22A6 code to appear on a 2014 Chevrolet Silverado?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a malfunctioning engine control module (ECM).

4. How can I diagnose the P22A6 code on my Silverado?

Start by checking the wiring and connectors for damage or corrosion. Use an OBDII scanner to verify the code and test the NOx sensor heater circuit for proper voltage and resistance.

5. Can I drive my 2014 Chevrolet Silverado with a P22A6 code?

Driving with this code is not recommended as it can lead to reduced performance, higher emissions, and potential damage to other components.

6. How do you fix the P22A6 code on a 2014 Chevrolet Silverado?

Repairs may include replacing the NOx sensor, repairing or replacing damaged wiring, or updating/reprogramming the ECM as necessary.

7. How much does it cost to fix the P22A6 code on a 2014 Chevrolet Silverado?

The repair cost depends on the issue but typically ranges from $300 to $700, with NOx sensor replacement being the most common expense.

8. Where is NOx Sensor 2 located on a 2014 Chevrolet Silverado?

NOx Sensor 2 is located downstream in the exhaust system, typically after the catalytic converter.

9. Can a bad NOx sensor cause other issues in my Silverado?

Yes, a faulty NOx sensor can lead to increased emissions, poor fuel economy, and potential damage to the catalytic converter over time.

10. Do I need to reprogram the ECM after replacing the NOx sensor on a 2014 Silverado?

In some cases, the ECM may require reprogramming or resetting to properly recognize the new sensor and clear the P22A6 code.

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