AutoCodes – Chevrolet – P22A7 2016 Chevrolet Silverado

P22A7 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Performance

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: P22A7 2016 Chevrolet Silverado indicates NOx Sensor 2 Heater Feedback Performance.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 744

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P22A7 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 P22A7 2016 Chevrolet Silverado - NOx Sensor 2 Heater Feedback Performance - AutoCodes.com — P22A7 2016 Chevrolet Silverado Code - NOx Sensor 2 Heater Feedback Performance

What does this mean?

What are the Possible Causes of the DTC P22A7 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 P22A7 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 P22A7 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 P22A7 2016 Chevrolet Silverado code?

Need more information on how to fix the P22A7 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A7 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 P22A7 2016 Chevrolet Silverado Code

1. What does the OBDII code P22A7 mean on a 2016 Chevrolet Silverado?

The P22A7 code indicates an issue with the performance of the NOx Sensor 2 heater feedback circuit, which monitors the heater's functionality in the downstream NOx sensor.

2. What are the common symptoms of code P22A7 in a 2016 Chevrolet Silverado?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and the vehicle potentially entering limp mode.

3. What causes the P22A7 code to appear on a 2016 Chevrolet Silverado?

Common causes include a faulty NOx sensor, wiring or connector issues, a malfunctioning sensor heater, or carbon buildup affecting the sensor's operation.

4. Is it safe to drive with the P22A7 code on a 2016 Chevrolet Silverado?

While the truck may still be drivable, it could operate less efficiently and produce higher emissions. Prolonged driving without addressing the issue could damage other components, such as the catalytic converter.

5. How do I diagnose the P22A7 code on a 2016 Chevrolet Silverado?

Diagnosis typically involves scanning for related codes, inspecting the NOx sensor and its wiring, and testing the sensor heater circuit with a multimeter to confirm proper resistance and voltage.

6. Can I fix the P22A7 code on my 2016 Chevrolet Silverado myself?

If you're experienced with automotive repairs, you can inspect and replace the NOx sensor or repair wiring issues. However, advanced diagnostics may require professional tools and expertise.

7. How much does it cost to fix the P22A7 code on a 2016 Chevrolet Silverado?

The cost depends on the root cause. Replacing a NOx sensor typically costs $300-$800, including parts and labor, but repairing wiring may be less expensive.

8. Do I need to replace the NOx sensor to fix the P22A7 code?

Not always. The issue could be related to wiring, connectors, or the sensor's heater circuit. Proper diagnostics are essential before replacing the sensor.

9. What is the function of NOx Sensor 2 in a 2016 Chevrolet Silverado?

NOx Sensor 2 monitors nitrogen oxide levels downstream of the catalytic converter to ensure the emissions system is working correctly.

10. Can a software update fix the P22A7 code on a 2016 Chevrolet Silverado?

In some cases, a software update for the engine control module (ECM) might resolve the issue if it's a known programming bug. Consult a dealership or certified mechanic for more information.