AutoCodes – Chevrolet – P22B6 2015 Chevrolet Silverado

P22B6 2015 Chevrolet Silverado Code - HO2S Pump Current Trim Circuit Low Voltage Sensor 2

Quick Answer

The oxygen content of the exhaust is measured via the nitrogen oxide (NOx) sensors. Common causes include Faulty Nitrogen Oxide (NOx) Sensor 2, Nitrogen Oxide Sensor 2 harness is open or shorted, Nitrogen Oxide 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: P22B6 2015 Chevrolet Silverado indicates HO2S Pump Current Trim Circuit Low Voltage Sensor 2.
Common causes: Common causes include Faulty Nitrogen Oxide (NOx) Sensor 2, Nitrogen Oxide Sensor 2 harness is open or shorted, Nitrogen Oxide 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 310

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 Sep 30, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P22B6 2015 Chevrolet Silverado Description

The oxygen content of the exhaust is measured via the nitrogen oxide (NOx) sensors. 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 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 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 when the NOx sensor module detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor.

OBDII Code P22B6 2015 Chevrolet Silverado - HO2S Pump Current Trim Circuit Low Voltage Sensor 2 - AutoCodes.com — P22B6 2015 Chevrolet Silverado Code - HO2S Pump Current Trim Circuit Low Voltage Sensor 2

What does this mean?

What are the Possible Causes of the DTC P22B6 2015 Chevrolet Silverado?

Faulty Nitrogen Oxide (NOx) Sensor 2
Nitrogen Oxide Sensor 2 harness is open or shorted
Nitrogen Oxide Sensor 2 circuit poor electrical connection

How to Fix the DTC P22B6 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 P22B6 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 P22B6 2015 Chevrolet Silverado code?

Need more information on how to fix the P22B6 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 P22B6 2015 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P22B6 in a 2015 Chevrolet Silverado?

- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the Check Engine light.

2. What does the OBDII code P22B6 indicate in a 2015 Chevrolet Silverado?

- The code P22B6 indicates a fault in the HO2S (Heated Oxygen Sensor) Pump Current Trim Circuit Low Voltage for Sensor 2 in the exhaust system.

3. What are possible causes of the HO2S Pump Current Trim Circuit Low Voltage code in a 2015 Chevrolet Silverado?

- Potential causes include a faulty HO2S sensor, damaged wiring or connectors in the sensor circuit, issues with the sensor heater circuit, or a malfunctioning ECM.

4. How can I diagnose the P22B6 code in my 2015 Chevrolet Silverado?

- Diagnose the code by conducting a visual inspection of the sensor and its wiring, testing the sensor's resistance and voltage, checking the sensor heater circuit, and scanning the ECM for related trouble codes.

5. Can I continue driving my 2015 Chevrolet Silverado with the P22B6 code?

- It is not recommended to drive your vehicle with the P22B6 code present, as it can lead to further damage and potential engine performance issues.

6. How serious is the HO2S Pump Current Trim Circuit Low Voltage code in a 2015 Chevrolet Silverado?

- While the code may not cause immediate drivability issues, it can affect engine performance and fuel efficiency if left unresolved, potentially leading to more significant problems over time.

7. How can I repair the HO2S Pump Current Trim Circuit Low Voltage issue in my 2015 Chevrolet Silverado?

- Repair options include replacing the faulty HO2S sensor, repairing or replacing damaged wiring or connectors, addressing issues with the sensor heater circuit, or reprogramming the ECM if necessary.

8. Is it safe to reset the Check Engine light after fixing the P22B6 code in a 2015 Chevrolet Silverado?

- It is recommended to clear the Check Engine light using an OBDII scanner after repairing the issue to ensure the system has been reset and to monitor for any recurring problems.

9. Can a DIY enthusiast fix the P22B6 code in a 2015 Chevrolet Silverado?

- Depending on your level of automotive experience and access to tools, you may be able to address the P22B6 code yourself by following repair guides and procedures specific to your vehicle.

10. How can I prevent the HO2S Pump Current Trim Circuit Low Voltage code from recurring in my 2015 Chevrolet Silverado?

- Regular maintenance, including checking and replacing sensors as needed, ensuring proper wiring connections, and addressing any engine performance issues promptly, can help prevent the code from reappearing in the future.