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AutoCodes – Chevrolet – P22B7 2015 Chevrolet Silverado

P22B7 2015 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 2015 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 275
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Sep 30, 2022
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Code P22B7 2015 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 2015 Chevrolet Silverado - HO2S Pump Current Trim Circuit High Voltage Sensor 2 - AutoCodes.com
P22B7 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P22B7 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P22B7 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado Code

1. What does the OBDII code P22B7 mean for a 2015 Chevrolet Silverado?

P22B7 indicates "HO2S Pump Current Trim Circuit High Voltage Sensor 2," meaning there’s an issue with the oxygen sensor (HO2S) pump current trim circuit, specifically for Sensor 2.

2. What are the common symptoms of code P22B7 on a 2015 Chevrolet Silverado?

Symptoms include poor fuel economy, reduced engine performance, rough idling, hesitation during acceleration, and an illuminated check engine light.

3. What causes the P22B7 code on a 2015 Chevrolet Silverado?

Common causes include a faulty oxygen sensor (Sensor 2), damaged wiring or connectors in the HO2S circuit, a short circuit, or issues with the engine control module (ECM).

4. Which oxygen sensor is affected by the P22B7 code on the 2015 Chevrolet Silverado?

Sensor 2 refers to the downstream oxygen sensor, which is located after the catalytic converter.

5. Can I drive my 2015 Chevrolet Silverado with the P22B7 code?

While the truck may still be drivable, ignoring the code could lead to increased fuel consumption and potentially damage the catalytic converter or other components.

6. How do I fix the P22B7 code on a 2015 Chevrolet Silverado?

Repairs typically involve inspecting and replacing the downstream oxygen sensor, repairing damaged wiring or connectors, and, if necessary, reprogramming or replacing the ECM.

7. How do I diagnose the P22B7 code on my 2015 Chevrolet Silverado?

Use an OBDII scanner to confirm the code, inspect the wiring and connectors around Sensor 2, and test the oxygen sensor for proper operation using a multimeter or specialized tools.

8. Is a faulty ECM a likely cause of the P22B7 code on a 2015 Chevrolet Silverado?

While rare, a malfunctioning ECM can cause this code if it fails to properly regulate the HO2S pump current trim circuit.

9. How much does it cost to repair the P22B7 code on a 2015 Chevrolet Silverado?

The cost can vary but typically ranges from $100 to $300 for an oxygen sensor replacement, depending on labor rates and part costs.

10. What happens if I don’t fix the P22B7 code on my 2015 Chevrolet Silverado?

Ignoring the code can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time.

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