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P22A5 2017 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit High 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: P22A5 2017 Chevrolet Silverado indicates NOx Sensor 2 Heater Control Circuit High 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 256

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 P22A5 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 P22A5 2017 Chevrolet Silverado - NOx Sensor 2 Heater Control Circuit High Voltage - AutoCodes.com — P22A5 2017 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A5 2017 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 P22A5 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 P22A5 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 P22A5 2017 Chevrolet Silverado code?

Need more information on how to fix the P22A5 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A5 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 P22A5 2017 Chevrolet Silverado Code

1. What does the OBDII code P22A5 mean on a 2017 Chevrolet Silverado?

The P22A5 code indicates a problem with the NOx Sensor 2 Heater Control Circuit, specifically detecting high voltage in the circuit.

2. What are the symptoms of a P22A5 code on a 2017 Chevy Silverado?

Symptoms may include a Check Engine Light, reduced fuel efficiency, poor engine performance, and the vehicle possibly entering a "limp mode."

3. What causes a P22A5 code on a 2017 Chevrolet Silverado?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the heater control circuit, or a malfunctioning powertrain control module (PCM).

4. How do you diagnose a P22A5 code on a 2017 Chevy Silverado?

Diagnosis involves using an OBDII scanner, inspecting the NOx sensor 2 and its wiring for damage, checking for continuity in the heater control circuit, and testing the PCM if necessary.

5. Can you drive a 2017 Chevy Silverado with a P22A5 code?

While the vehicle may still be drivable, ignoring the issue can lead to reduced performance, higher emissions, and potential damage to the exhaust system.

6. How is a P22A5 code fixed on a 2017 Chevrolet Silverado?

Repairs may include replacing the NOx sensor 2, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if itâ€™s faulty.

7. What tools are needed to fix a P22A5 code on a 2017 Chevy Silverado?

Youâ€™ll need an OBDII scanner, a multimeter for testing the circuit, and possibly basic hand tools to replace the NOx sensor or repair wiring.

8. How much does it cost to repair a P22A5 code on a 2017 Chevrolet Silverado?

The cost varies but typically ranges from $300 to $800, depending on whether the NOx sensor needs replacement and if additional wiring repairs are required.

9. Can a bad NOx sensor cause other problems in a 2017 Chevrolet Silverado?

Yes, a bad NOx sensor can lead to increased emissions, reduced engine efficiency, and potential damage to the catalytic converter over time.

10. Is the P22A5 code covered under warranty for a 2017 Chevrolet Silverado?

It may be covered under the emissions warranty, depending on the mileage and age of the vehicle. Check with your dealership or warranty provider for specifics.