AutoCodes – GMC – P22B6 2016 GMC Sierra

P22B6 2016 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 2016 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 162

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 2016 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 2016 GMC Sierra - HO2S Pump Current Trim Circuit Low Voltage Sensor 2 - AutoCodes.com — P22B6 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra code?

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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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P22B6 in a 2016 GMC Sierra?

The common symptoms of code P22B6 include poor engine performance, reduced fuel efficiency, rough idling, and possible stalling of the vehicle.

2. What does the OBDII code P22B6 "HO2S Pump Current Trim Circuit Low Voltage Sensor 2" mean for a 2016 GMC Sierra?

This code indicates that there is a low voltage condition in the circuit related to the oxygen sensor heater control for sensor 2 in bank 1.

3. What are the possible causes of OBDII code P22B6 in a 2016 GMC Sierra?

Possible causes of code P22B6 include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the engine control module (ECM).

4. How can I diagnose the OBDII code P22B6 in my 2016 GMC Sierra?

Diagnosing code P22B6 involves using a scan tool to read the code, checking the oxygen sensor wiring and connectors for damage, testing the sensor heater circuit, and inspecting the ECM for any faults.

5. Can I still drive my 2016 GMC Sierra with OBDII code P22B6?

It is not recommended to drive the vehicle with an unresolved P22B6 code as it can lead to further damage to the engine and emission control system.

6. How can I repair OBDII code P22B6 in my 2016 GMC Sierra?

To repair code P22B6, you may need to replace the oxygen sensor, repair any damaged wiring or connectors, replace a blown fuse if necessary, or reprogram the ECM.

7. Will resetting the OBDII code P22B6 in my 2016 GMC Sierra make it go away permanently?

Resetting the code may temporarily make the warning light disappear, but if the underlying issue causing code P22B6 is not fixed, the code is likely to return.

8. Is it possible to prevent OBDII code P22B6 from appearing in my 2016 GMC Sierra?

Regular maintenance, such as checking and replacing oxygen sensors as recommended, keeping the wiring harness in good condition, and addressing any ECM issues promptly, can help prevent code P22B6 from occurring.

9. Can a DIY enthusiast fix OBDII code P22B6 in a 2016 GMC Sierra?

While some aspects of diagnosing and repairing code P22B6 can be done by a DIY enthusiast with the right tools and knowledge, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

10. How much does it cost to repair OBDII code P22B6 in a 2016 GMC Sierra?

The cost of repairing code P22B6 can vary depending on the underlying issue, such as replacing an oxygen sensor, repairing wiring, or addressing ECM problems. It is advisable to obtain a diagnostic and repair estimate from a qualified mechanic.