AutoCodes – GMC – P22B7 2014 GMC Sierra

P22B7 2014 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 2014 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 167

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 P22B7 2014 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 2014 GMC Sierra - HO2S Pump Current Trim Circuit High Voltage Sensor 2 - AutoCodes.com — P22B7 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the P22B7 2014 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 2014 GMC Sierra Code

1. What does the OBDII code P22B7 mean on a 2014 GMC Sierra?

The P22B7 code indicates a problem with the HO2S (Heated Oxygen Sensor) Pump Current Trim Circuit, specifically high voltage detected in Sensor 2.

2. What are the common symptoms of the P22B7 code in a 2014 GMC Sierra?

Common symptoms include the check engine light being on, reduced fuel efficiency, poor engine performance, and possible rough idling.

3. What causes the P22B7 code on a GMC Sierra?

Possible causes include a faulty oxygen sensor, damaged wiring or connectors in the circuit, incorrect fuel mixture, or a malfunctioning PCM (Powertrain Control Module).

4. How can I diagnose the P22B7 code on my GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion, testing the oxygen sensorâ€™s functionality, and verifying fuel system operation. Use an OBDII scanner to confirm related codes.

5. Can I drive my GMC Sierra with the P22B7 code?

While the truck may still be drivable, prolonged operation can lead to reduced efficiency and potential damage to the catalytic converter or other engine components.

6. How do I fix the P22B7 code on a 2014 GMC Sierra?

Repairs may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, or updating/reprogramming the PCM if necessary.

7. How much does it cost to fix the P22B7 code on a GMC Sierra?

Costs vary depending on the repair, but replacing an oxygen sensor can range from $150 to $300, while wiring repairs or PCM reprogramming may cost more.

8. Can a dirty or clogged catalytic converter cause the P22B7 code?

Yes, a clogged catalytic converter can affect exhaust flow and potentially contribute to issues detected by the oxygen sensor.

9. Do I need special tools to fix the P22B7 code on my GMC Sierra?

An OBDII scanner, multimeter, and potentially an oxygen sensor socket are useful for diagnosing and repairing this issue.

10. How can I prevent the P22B7 code from recurring?

Ensure proper maintenance of the fuel and exhaust systems, use high-quality fuel, and periodically inspect wiring and oxygen sensors for wear or damage.