AutoCodes – GMC – P22B7 2015 GMC Sierra

P22B7 2015 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 2015 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 243

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 2015 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 2015 GMC Sierra - HO2S Pump Current Trim Circuit High Voltage Sensor 2 - AutoCodes.com — P22B7 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the P22B7 2015 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 P22B7 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P22B7 in a 2015 GMC Sierra?

- Common symptoms include the check engine light coming on, decreased fuel efficiency, rough idling, and potential engine misfires.

2. What can cause the HO2S Pump Current Trim Circuit High Voltage Sensor 2 code (P22B7) in a 2015 GMC Sierra?

- Possible causes include a faulty HO2S (Heated Oxygen Sensor), damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

3. How can I diagnose the P22B7 code in my 2015 GMC Sierra?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the HO2S sensor and its connections, and conducting tests to pinpoint the exact issue.

4. Can I continue driving my 2015 GMC Sierra with the P22B7 trouble code?

- It is not recommended to ignore this code and continue driving, as it can lead to further damage to the vehicle and potentially affect its performance. It's best to address the issue promptly.

5. How can I repair the HO2S Pump Current Trim Circuit High Voltage Sensor 2 code in my GMC Sierra?

- The repair process may involve replacing the faulty HO2S sensor, repairing damaged wiring or connectors, or reprogramming the engine control module, depending on the underlying cause.

6. Will resetting the trouble codes make the P22B7 code disappear permanently?

- Resetting the trouble codes may temporarily turn off the check engine light, but if the underlying issue causing the P22B7 code is not addressed, it is likely to reappear after driving the vehicle for a while.

7. Is it possible to fix the P22B7 code in a 2015 GMC Sierra by cleaning the sensor?

- Cleaning the sensor may help in some cases if the issue is related to contamination, but if the sensor is faulty or damaged, cleaning it may not resolve the problem permanently.

8. Can a DIY enthusiast fix the P22B7 code in a 2015 GMC Sierra?

- While some basic diagnostics and repairs can be done by DIY enthusiasts, diagnosing and fixing complex issues related to the P22B7 code may require professional expertise and specialized tools.

9. How much does it typically cost to repair the HO2S Pump Current Trim Circuit High Voltage Sensor 2 code in a GMC Sierra?

- The cost of repairing the P22B7 code can vary depending on the exact cause of the issue, the extent of repairs needed, and whether you choose to do the repairs yourself or take the vehicle to a mechanic.

10. Are there any recalls or technical service bulletins related to the P22B7 code in a 2015 GMC Sierra?

- It's advisable to check with a GMC dealership or refer to online resources to see if there are any recalls or technical service bulletins related to the P22B7 code specific to your vehicle model and year.