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P22A5 2015 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 2015 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 199
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 P22A5 2015 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 2015 Chevrolet Silverado - NOx Sensor 2 Heater Control Circuit High Voltage - AutoCodes.com
P22A5 2015 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit High Voltage
What does this mean?

What are the Possible Causes of the DTC P22A5 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P22A5 2015 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 P22A5 2015 Chevrolet Silverado Code

What does the OBDII code P22A5 mean on a 2015 Chevrolet Silverado?

The P22A5 code indicates a high voltage issue in the heater control circuit for NOx Sensor 2, which monitors nitrogen oxide emissions.

What are the symptoms of code P22A5 on a 2015 Chevrolet Silverado?

Common symptoms include an illuminated check engine light, reduced fuel efficiency, and potential limp mode activation.

What causes the P22A5 code to appear in a 2015 Chevrolet Silverado?

Possible causes include a faulty NOx Sensor 2, damaged wiring or connectors, or a malfunctioning NOx sensor heater control module.

Can I drive my 2015 Chevrolet Silverado with the P22A5 code?

While driving is possible, it’s not recommended as it may lead to increased emissions, reduced performance, or potential damage to the emissions system.

How do I diagnose the P22A5 code on a 2015 Chevrolet Silverado?

Diagnosis involves scanning for codes, inspecting the NOx Sensor 2 and its wiring, and testing the heater control circuit for voltage irregularities.

How much does it cost to repair the P22A5 code on a 2015 Chevrolet Silverado?

Repair costs vary but typically range from $300 to $800, depending on whether the NOx sensor or wiring needs replacement.

Can a faulty NOx sensor cause other issues in my 2015 Chevrolet Silverado?

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

How do I reset the P22A5 code after repairs on a 2015 Chevrolet Silverado?

After repairs, use an OBDII scanner to clear the code and verify that it does not return during a test drive.

What is the role of the NOx Sensor 2 heater in a 2015 Chevrolet Silverado?

The heater ensures the NOx sensor reaches its operating temperature quickly for accurate emissions monitoring.

Can I replace the NOx Sensor 2 myself to fix the P22A5 code on a 2015 Chevrolet Silverado?

If you have basic mechanical skills and the right tools, you can replace it, but professional diagnosis is recommended to confirm the root cause.

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