AutoCodes – Chevrolet – P22A8 2016 Chevrolet Silverado

P22A8 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: P22A8 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 215

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 P22A8 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 P22A8 2016 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Circuit Low Voltage - AutoCodes.com — P22A8 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P22A8 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 P22A8 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 P22A8 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 P22A8 2016 Chevrolet Silverado code?

Need more information on how to fix the P22A8 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A8 2016 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 P22A8 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A8 in a 2016 Chevrolet Silverado related to the NOx Sensor 2 Heater Feedback Circuit Low Voltage?

- Common symptoms include poor engine performance, decreased fuel efficiency, illuminated Check Engine Light, and potential emissions issues.

2. What are the possible causes of the NOx Sensor 2 Heater Feedback Circuit Low Voltage code (P22A8) in a 2016 Chevrolet Silverado?

- Potential causes may include a faulty NOx sensor, damaged wiring or connectors, a malfunctioning heater circuit, or issues with the vehicle's powertrain control module.

3. How can I diagnose the NOx Sensor 2 Heater Feedback Circuit Low Voltage issue in my 2016 Chevrolet Silverado?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and related components for damage, and testing the circuit for proper voltage and continuity.

4. Can I continue driving my 2016 Chevrolet Silverado with the P22A8 fault code related to the NOx Sensor 2 Heater Feedback Circuit Low Voltage?

- It is not recommended to continue driving with this fault code as it can lead to potential engine performance issues and may cause further damage if left unresolved.

5. How can I repair the NOx Sensor 2 Heater Feedback Circuit Low Voltage issue in my 2016 Chevrolet Silverado?

- Repair options may include replacing the faulty NOx sensor, repairing damaged wiring or connectors, addressing heater circuit issues, and resetting the fault code using an OBDII scanner.

6. Are there any DIY tips for troubleshooting the NOx Sensor 2 Heater Feedback Circuit Low Voltage code in a 2016 Chevrolet Silverado?

- DIY tips may include visually inspecting the sensor and wiring for any obvious damage, checking related fuses, and ensuring proper connections before considering more advanced diagnostics or repairs.

7. Is it necessary to reset the Check Engine Light after repairing the NOx Sensor 2 Heater Feedback Circuit Low Voltage issue in a 2016 Chevrolet Silverado?

- Yes, it is recommended to reset the Check Engine Light using an OBDII scanner after resolving the underlying problem to clear the fault code and ensure proper monitoring of the vehicle's systems.

8. Can extreme weather conditions affect the NOx Sensor 2 Heater Feedback Circuit Low Voltage code in a 2016 Chevrolet Silverado?

- Extreme weather conditions, particularly cold temperatures, can impact the performance of the NOx sensor heater circuit and may contribute to the low voltage feedback issue.

9. How much does it cost to repair the NOx Sensor 2 Heater Feedback Circuit Low Voltage issue in a 2016 Chevrolet Silverado?

- Repair costs can vary depending on the specific cause of the fault, parts needed for replacement, labor rates, and dealership vs. independent repair shop prices. It's advisable to obtain quotes from multiple sources.

10. Can the NOx Sensor 2 Heater Feedback Circuit Low Voltage issue affect the emissions performance of a 2016 Chevrolet Silverado?

- Yes, unresolved issues related to the NOx sensor can impact the vehicle's emissions output, potentially causing it to fail emissions tests and leading to environmental concerns.