AutoCodes – Chevrolet – P22B6 2018 Chevrolet Silverado

P22B6 2018 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 2018 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 395

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 2018 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 2018 Chevrolet Silverado - HO2S Pump Current Trim Circuit Low Voltage Sensor 2 - AutoCodes.com — P22B6 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P22B6 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22B6 2018 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 P22B6 2018 Chevrolet Silverado Code

1. What are common symptoms of OBDII code P22B6 in a 2018 Chevrolet Silverado?

Possible symptoms include engine misfires, reduced fuel efficiency, rough idling, and a decrease in overall performance.

2. What does the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 code indicate in a 2018 Chevrolet Silverado?

This code indicates an issue with the oxygen sensor (HO2S) pump current trim circuit, specifically related to low voltage in sensor 2.

3. What are possible causes of OBDII code P22B6 in a 2018 Chevrolet Silverado?

Potential causes include a faulty oxygen sensor, damaged wiring or connectors, a malfunctioning oxygen sensor heater circuit, or issues with the engine control module (ECM).

4. How can I diagnose the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 code in my 2018 Chevrolet Silverado?

Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the oxygen sensor and related components for damage, and testing the circuitry for proper voltage and continuity.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P22B6?

It is not recommended to drive with this code present, as it can lead to further engine damage and potential safety hazards. It's advisable to address the issue promptly.

6. How can I repair OBDII code P22B6 in my 2018 Chevrolet Silverado?

Repair options may include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, resetting the ECM, or seeking professional assistance for a thorough diagnosis and repair.

7. Are there any DIY tips for fixing the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 code in a 2018 Chevrolet Silverado?

DIY tips may include checking and cleaning the oxygen sensor connectors, inspecting the wiring for visible damage, and ensuring all connections are secure before considering sensor replacement.

8. Will resetting the check engine light resolve OBDII code P22B6 in a 2018 Chevrolet Silverado?

Resetting the check engine light may temporarily clear the code, but if the underlying issue causing the fault code is not addressed, the code is likely to reappear.

9. How urgent is it to address OBDII code P22B6 in a 2018 Chevrolet Silverado?

It's important to address this code promptly to prevent potential engine damage, decreased fuel efficiency, and other performance issues that may arise from a faulty oxygen sensor.

10. Can a mechanic help me diagnose and repair OBDII code P22B6 in my 2018 Chevrolet Silverado?

Yes, a qualified mechanic can conduct a thorough diagnosis using specialized tools and expertise to accurately pinpoint the issue and recommend the appropriate repair steps for resolving the fault code.