AutoCodes – Chevrolet – P22B7 2017 Chevrolet Silverado

P22B7 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 666

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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado - HO2S Pump Current Trim Circuit High Voltage Sensor 2 - AutoCodes.com — P22B7 2017 Chevrolet Silverado Code - HO2S Pump Current Trim Circuit High Voltage Sensor 2

What does this mean?

What are the Possible Causes of the DTC P22B7 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado?

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 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P22B7 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado Code

1. What does OBDII code P22B7 mean on a 2017 Chevrolet Silverado?

P22B7 indicates a high voltage issue in the HO2S (Heated Oxygen Sensor) Pump Current Trim Circuit for Sensor 2, which monitors the oxygen levels in the exhaust for proper fuel mixture adjustments.

2. What are the common symptoms of code P22B7 in a 2017 Chevrolet Silverado?

Common symptoms include the check engine light turning on, poor fuel efficiency, rough idling, reduced engine performance, and possibly higher emissions.

3. What causes the P22B7 code to appear on a 2017 Chevrolet Silverado?

Possible causes include a faulty oxygen sensor (Sensor 2), damaged wiring or connectors in the circuit, a failed PCM (Powertrain Control Module), or excessive exhaust leaks.

4. How do I diagnose the P22B7 code on my Silverado?

Start by using an OBDII scanner to confirm the code. Then inspect the wiring and connectors for damage or corrosion, check the oxygen sensorâ€™s operation, and test for exhaust leaks.

5. Can a faulty oxygen sensor cause the P22B7 code?

Yes, a faulty Sensor 2 oxygen sensor is one of the most common causes of this code.

6. Is it safe to drive my 2017 Chevrolet Silverado with the P22B7 code?

Driving is possible but not recommended. The issue can lead to poor performance, increased emissions, and potential damage to other components if not addressed.

7. How can I fix the P22B7 code on my Silverado?

Repairs may include replacing the faulty HO2S (Sensor 2), repairing or replacing damaged wiring, fixing exhaust leaks, or reprogramming or replacing the PCM if necessary.

8. What tools do I need to troubleshoot the P22B7 code?

Youâ€™ll need an OBDII scanner, a multimeter to test electrical connections, and tools to inspect and possibly replace the oxygen sensor or wiring.

9. How much does it cost to fix the P22B7 code on a 2017 Chevrolet Silverado?

Repair costs vary. Replacing an oxygen sensor typically costs $150â€“$300, while wiring repairs or PCM replacements may be higher depending on labor and parts.

10. Can an exhaust leak trigger the P22B7 code?

Yes, an exhaust leak can disrupt the sensor's readings and cause the P22B7 code by affecting the oxygen levels in the exhaust stream.