AutoCodes – GMC – P22B7 2016 GMC Sierra

P22B7 2016 GMC Sierra Code - HO2S Pump Current Trim Circuit High 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: P22B7 2016 GMC Sierra indicates HO2S Pump Current Trim Circuit High 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 227

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 P22B7 2016 GMC Sierra Description

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

OBDII Code P22B7 2016 GMC Sierra - HO2S Pump Current Trim Circuit High Voltage Sensor 2 - AutoCodes.com — P22B7 2016 GMC Sierra Code - HO2S Pump Current Trim Circuit High Voltage Sensor 2

What does this mean?

What are the Possible Causes of the DTC P22B7 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 P22B7 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 P22B7 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 P22B7 2016 GMC Sierra code?

Need more information on how to fix the P22B7 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22B7 2016 GMC Sierra 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 P22B7 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P22B7 in a 2016 GMC Sierra?

The common symptoms of code P22B7 in a 2016 GMC Sierra include decreased fuel efficiency, rough idling, misfiring, and the illumination of the Check Engine Light.

2. What does the OBDII code P22B7 HO2S Pump Current Trim Circuit High Voltage Sensor 2 mean in a 2016 GMC Sierra?

The P22B7 code indicates an issue with the oxygen sensor pump current trim circuit on sensor 2 in a 2016 GMC Sierra.

3. What are the possible causes of OBDII code P22B7 in a 2016 GMC Sierra?

Possible causes of code P22B7 in a 2016 GMC Sierra include a faulty oxygen sensor, damaged wiring or connectors, a malfunctioning oxygen sensor pump, or an issue with the engine control module.

4. How serious is OBDII code P22B7 in a 2016 GMC Sierra?

While the vehicle may still be driveable with code P22B7, it is important to address the issue promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance.

5. How can I diagnose and repair OBDII code P22B7 in a 2016 GMC Sierra?

Diagnosing and repairing code P22B7 typically involves inspecting the oxygen sensor and its related components, checking for wiring issues, testing the oxygen sensor pump, and potentially replacing faulty parts as needed.

6. Can I continue to drive my 2016 GMC Sierra with OBDII code P22B7?

It is generally not recommended to continue driving your vehicle with an unresolved P22B7 code, as it can lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter.

7. How much does it cost to fix OBDII code P22B7 in a 2016 GMC Sierra?

The cost to fix code P22B7 can vary depending on the underlying issue causing the code. It is advisable to consult with a professional mechanic to get an accurate estimate for the repair.

8. Can a DIY enthusiast fix OBDII code P22B7 in a 2016 GMC Sierra?

While some DIY enthusiasts may have the skills to diagnose and repair code P22B7, it is recommended to seek assistance from a qualified mechanic, especially for more complex issues related to the oxygen sensor system.

9. Will resetting the Check Engine Light resolve OBDII code P22B7 in a 2016 GMC Sierra?

Simply resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing code P22B7. It is important to diagnose and address the root cause of the problem to prevent further issues.

10. How can I prevent OBDII code P22B7 from occurring in my 2016 GMC Sierra?

To prevent code P22B7, it is essential to perform regular maintenance on your vehicle, including checking the oxygen sensor system for any signs of wear or damage, and addressing any issues promptly.