AutoCodes – Chevrolet – P22A5 2014 Chevrolet Silverado

P22A5 2014 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 2014 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 244

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 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 P22A5 2014 Chevrolet Silverado - NOx Sensor 2 Heater Control Circuit High Voltage - AutoCodes.com — P22A5 2014 Chevrolet Silverado Code - NOx Sensor 2 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A5 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 P22A5 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 P22A5 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 P22A5 2014 Chevrolet Silverado code?

Need more information on how to fix the P22A5 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22A5 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 P22A5 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P22A5 in a 2014 Chevrolet Silverado?

- Common symptoms include the Check Engine Light illuminating, decreased fuel efficiency, and potential engine performance issues.

2. What does the OBDII code P22A5 indicate for a 2014 Chevrolet Silverado?

- OBDII code P22A5 indicates an issue with the NOx Sensor 2 Heater Control Circuit showing high voltage.

3. What are the possible causes of OBDII code P22A5 in a 2014 Chevrolet Silverado?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, or an issue with the engine control module (ECM).

4. How serious is the OBDII code P22A5 issue in a 2014 Chevrolet Silverado?

- While the issue may not immediately affect vehicle performance, it is important to address it promptly to prevent potential damage to the emission control system.

5. Can I continue driving my 2014 Chevrolet Silverado with OBDII code P22A5?

- It is generally safe to drive the vehicle for a short period with this code, but it is recommended to have it diagnosed and repaired as soon as possible.

6. How can I diagnose the OBDII code P22A5 issue in my 2014 Chevrolet Silverado?

- Diagnosis involves using an OBDII scanner to read the code, inspecting the NOx sensor and its wiring, and testing the sensor's heater circuit for proper voltage.

7. Is it possible to repair OBDII code P22A5 in a 2014 Chevrolet Silverado myself?

- Repairing this code may require knowledge of automotive electrical systems. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

8. What are some tips for preventing OBDII code P22A5 in a 2014 Chevrolet Silverado?

- Regular maintenance, such as checking the condition of sensors and wiring, can help prevent issues like P22A5. Also, using quality fuel and following the manufacturer's maintenance schedule is important.

9. How much does it cost to repair OBDII code P22A5 in a 2014 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue, labor rates, and parts needed. It is advisable to obtain quotes from reputable mechanics or dealerships.

10. Can resetting the Check Engine Light resolve OBDII code P22A5 in a 2014 Chevrolet Silverado?

- Resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing OBDII code P22A5. It is crucial to address the root cause of the problem for a permanent solution.