AutoCodes – GMC – P22B6 2017 GMC Sierra

P22B6 2017 GMC Sierra 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 2017 GMC Sierra 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 303

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 Sep 30, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P22B6 2017 GMC Sierra 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 2017 GMC Sierra - HO2S Pump Current Trim Circuit Low Voltage Sensor 2 - AutoCodes.com — P22B6 2017 GMC Sierra Code - HO2S Pump Current Trim Circuit Low Voltage Sensor 2

What does this mean?

What are the Possible Causes of the DTC P22B6 2017 GMC Sierra?

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 2017 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 P22B6 2017 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 P22B6 2017 GMC Sierra code?

Need more information on how to fix the P22B6 2017 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 P22B6 2017 GMC Sierra Code

1. What are common symptoms of OBDII code P22B6 in a 2017 GMC Sierra?

The common symptoms of OBDII code P22B6 in a 2017 GMC Sierra may include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 error code mean in a 2017 GMC Sierra?

The P22B6 code indicates that there is a low voltage condition detected in the oxygen sensor pump current trim circuit for sensor 2 in a 2017 GMC Sierra.

3. What are the possible causes of the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 fault code?

Possible causes of the P22B6 code in a 2017 GMC Sierra include a faulty oxygen sensor, issues with the wiring or connectors related to the sensor, or a malfunction in the sensor pump circuit.

4. How can I diagnose the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 issue in my 2017 GMC Sierra?

Diagnosing the P22B6 code involves using an OBDII scanner to retrieve the specific fault code, visually inspecting the oxygen sensor and related wiring, and performing tests to determine the cause of the low voltage condition.

5. Is it safe to continue driving my 2017 GMC Sierra with the P22B6 code present?

It is not recommended to continue driving your 2017 GMC Sierra with the P22B6 code present, as it can lead to further damage to the vehicle's engine and emissions system.

6. Can I repair the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 issue in my 2017 GMC Sierra myself?

Depending on your level of automotive knowledge and experience, you may be able to repair the P22B6 code issue yourself by replacing the faulty oxygen sensor, repairing wiring or connectors, or addressing any other identified causes.

7. How much does it typically cost to repair the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 problem in a 2017 GMC Sierra?

The cost of repairing the P22B6 code in a 2017 GMC Sierra can vary depending on the specific cause of the issue, but it may involve expenses for parts and labor at a repair shop or dealership.

8. Will resetting the check engine light resolve the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 error code?

Simply resetting the check engine light will not fix the underlying issue causing the P22B6 code in a 2017 GMC Sierra. It is important to diagnose and repair the root cause of the problem to prevent it from reoccurring.

9. How can I prevent the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 code from reappearing in my 2017 GMC Sierra?

Regular vehicle maintenance, such as inspecting and replacing oxygen sensors as recommended, checking wiring connections, and addressing any engine performance issues promptly, can help prevent the recurrence of the P22B6 fault code.

10. Is the HO2S Pump Current Trim Circuit Low Voltage Sensor 2 issue covered under warranty for a 2017 GMC Sierra?

If your 2017 GMC Sierra is still within the warranty period, the repair for the P22B6 code may be covered under warranty, depending on the terms and conditions specified by the manufacturer. It is advisable to check with your dealership for more information.