AutoCodes – Chevrolet – P22A1 2014 Chevrolet Silverado

P22A1 2014 Chevrolet Silverado 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 Chevrolet Silverado 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 332

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 P22A1 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 P22A1 2014 Chevrolet Silverado - NOx Sensor 2 Circuit High Voltage - AutoCodes.com — P22A1 2014 Chevrolet Silverado Code - NOx Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A1 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 P22A1 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 P22A1 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 P22A1 2014 Chevrolet Silverado code?

Need more information on how to fix the P22A1 2014 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 P22A1 2014 Chevrolet Silverado Code

1. What does the OBDII code P22A1 mean on a 2014 Chevrolet Silverado?

P22A1 indicates a "NOx Sensor 2 Circuit High Voltage" issue, meaning the downstream NOx sensor is reporting unusually high voltage, which could signal a malfunction.

2. What are the symptoms of code P22A1 in a 2014 Chevrolet Silverado?

Common symptoms include the Check Engine Light turning on, reduced fuel efficiency, poor engine performance, and possible limp mode activation.

3. What causes the P22A1 code to appear on a 2014 Chevrolet Silverado?

Potential causes include a faulty NOx sensor, wiring or connector issues in the NOx sensor circuit, excessive soot buildup, or a failed PCM (Powertrain Control Module).

4. How do I diagnose the P22A1 code on my 2014 Chevrolet Silverado?

Start by scanning for codes using an OBDII scanner, inspect the NOx sensor wiring and connectors for damage or corrosion, and test the sensorâ€™s voltage output to verify functionality.

5. Can I drive my 2014 Chevrolet Silverado with a P22A1 code?

While the truck may still drive, it is not recommended to ignore this code. Prolonged driving could lead to increased emissions, reduced performance, or damage to the emissions system.

6. How much does it cost to repair a P22A1 code on a 2014 Chevrolet Silverado?

Repair costs range from $300 to $700, depending on whether the NOx sensor needs replacement or if there are wiring issues that require repair.

7. Where is NOx Sensor 2 located on a 2014 Chevrolet Silverado?

The NOx Sensor 2 is typically located downstream in the exhaust system, after the diesel particulate filter (DPF).

8. How do I fix the P22A1 code on my 2014 Chevrolet Silverado?

Repairs may include replacing the faulty NOx sensor, repairing or cleaning its wiring or connectors, or reprogramming/updating the PCM if necessary.

9. Can a clogged diesel particulate filter (DPF) cause the P22A1 code?

Yes, a clogged DPF can disrupt exhaust flow and affect NOx sensor readings, potentially causing high voltage issues.

10. Do I need to replace the NOx sensor to fix the P22A1 code?

Not always. Inspect and test the sensor and its connections first, as wiring issues or connector damage might be the root cause. Replace the sensor only if it is confirmed faulty.