AutoCodes – GMC – P22B7 2018 GMC Sierra

P22B7 2018 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 2018 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 236

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 2018 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 2018 GMC Sierra - HO2S Pump Current Trim Circuit High Voltage Sensor 2 - AutoCodes.com — P22B7 2018 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 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the P22B7 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P22B7 in a 2018 GMC Sierra?

- Common symptoms include the Check Engine Light (CEL) illuminating, decreased fuel efficiency, rough idling, and potentially poor engine performance.

2. What does the OBDII code P22B7 "HO2S Pump Current Trim Circuit High Voltage Sensor 2" mean for a 2018 GMC Sierra?

- This code indicates a high voltage condition in the circuit related to the oxygen sensor (HO2S) pump current trim for sensor 2 in the exhaust system.

3. What are the possible causes of OBDII code P22B7 in a 2018 GMC Sierra?

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

4. How can I diagnose the OBDII code P22B7 in my 2018 GMC Sierra?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the specific fault codes, inspecting the wiring and connectors related to the oxygen sensor, and testing the sensor's functionality.

5. Can I continue driving my 2018 GMC Sierra with the P22B7 code present?

- It is not recommended to continue driving with this code active, as it can lead to potential engine performance issues and may cause further damage if left unresolved.

6. How can I repair OBDII code P22B7 in my 2018 GMC Sierra?

- Repair options may include replacing the faulty oxygen sensor, repairing or replacing damaged wiring or connectors, addressing any issues with the sensor heater, or reprogramming the engine control module.

7. Is it possible to clear the P22B7 trouble code in a 2018 GMC Sierra without making repairs?

- While clearing the code may temporarily turn off the Check Engine Light, it is crucial to address the underlying issue causing the code to prevent potential long-term damage to the vehicle.

8. How much does it typically cost to repair OBDII code P22B7 in a 2018 GMC Sierra?

- Repair costs can vary depending on the specific cause of the code, but expenses may include parts such as an oxygen sensor, labor for diagnostics and repairs, and potentially the cost of a new engine control module if needed.

9. Are there any preventive measures to avoid OBDII code P22B7 in a 2018 GMC Sierra?

- Regular maintenance, such as checking and replacing oxygen sensors as recommended by the manufacturer, inspecting wiring for damage, and addressing any engine performance issues promptly, can help prevent this code from appearing.