AutoCodes – GMC – P22A1 2014 GMC Sierra

P22A1 2014 GMC Sierra Code - NOx Sensor 2 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: P22A1 2014 GMC Sierra indicates NOx Sensor 2 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

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
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Code P22A1 2014 GMC Sierra 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 P22A1 2014 GMC Sierra - NOx Sensor 2 Circuit High Voltage - AutoCodes.com — P22A1 2014 GMC Sierra Code - NOx Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A1 2014 GMC Sierra?

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 P22A1 2014 GMC Sierra?

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 P22A1 2014 GMC Sierra 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 P22A1 2014 GMC Sierra code?

Need more information on how to fix the P22A1 2014 GMC Sierra 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 P22A1 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A1 in a 2014 GMC Sierra related to NOx Sensor 2 Circuit High Voltage?

- Common symptoms include the check engine light coming on, reduced engine performance, and potentially poor fuel efficiency.

2. What are the possible causes of the NOx Sensor 2 Circuit High Voltage code (P22A1) in a 2014 GMC Sierra?

- Possible causes can include a faulty NOx sensor, wiring issues, a malfunctioning sensor heater, or issues with the engine control module.

3. How can I diagnose the NOx Sensor 2 Circuit High Voltage code in my 2014 GMC Sierra?

- Diagnosis typically involves using an OBDII scanner to read the trouble code, inspecting the NOx sensor and its wiring for damage, and testing the sensor's electrical connections.

4. Can driving with the P22A1 code in a 2014 GMC Sierra cause any further damage?

- Continuing to drive with this code may lead to increased emissions, reduced fuel efficiency, and potential damage to other components like the catalytic converter.

5. How can I repair the NOx Sensor 2 Circuit High Voltage issue in my 2014 GMC Sierra?

- Repair options can include replacing the faulty NOx sensor, repairing damaged wiring, checking and potentially replacing the sensor heater, or resetting the engine control module.

6. Is it safe to continue driving my 2014 GMC Sierra with the NOx Sensor 2 Circuit High Voltage code?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent any further damage and ensure optimal engine performance.

7. Can a DIY enthusiast fix the P22A1 code related to NOx Sensor 2 Circuit High Voltage in a 2014 GMC Sierra?

- Depending on the level of expertise, DIY enthusiasts may be able to diagnose and address simple causes like sensor or wiring replacements. However, complex issues may require professional assistance.

8. How much does it typically cost to repair the NOx Sensor 2 Circuit High Voltage issue in a 2014 GMC Sierra?

- Repair costs can vary based on the specific cause of the problem, but they may range from a couple of hundred dollars for sensor replacement to more for extensive wiring repairs.

9. Will resetting the check engine light resolve the P22A1 code in a 2014 GMC Sierra?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving cycles.

10. How often should the NOx sensor be replaced in a 2014 GMC Sierra to prevent issues like the P22A1 code?

- The NOx sensor typically has a long lifespan, but if recurring issues like the P22A1 code occur, it may be necessary to replace the sensor as part of regular maintenance.