AutoCodes – Chevrolet – P22B6 2016 Chevrolet Silverado

P22B6 2016 Chevrolet Silverado Code - HO2S Pump Current Trim Circuit Low 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: P22B6 2016 Chevrolet Silverado indicates HO2S Pump Current Trim Circuit Low 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 215

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 P22B6 2016 Chevrolet Silverado Description

The oxygen content of the exhaust is measured via the nitrogen oxide (NOx) sensors. The nitrogen oxides (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 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 P22B6 2016 Chevrolet Silverado - HO2S Pump Current Trim Circuit Low Voltage Sensor 2 - AutoCodes.com — P22B6 2016 Chevrolet Silverado Code - HO2S Pump Current Trim Circuit Low Voltage Sensor 2

What does this mean?

What are the Possible Causes of the DTC P22B6 2016 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 P22B6 2016 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 P22B6 2016 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 P22B6 2016 Chevrolet Silverado code?

Need more information on how to fix the P22B6 2016 Chevrolet Silverado 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 P22B6 2016 Chevrolet Silverado Code

1. What does the OBDII code P22B6 mean for a 2016 Chevrolet Silverado?

P22B6 indicates a "HO2S Pump Current Trim Circuit Low Voltage Sensor 2," which means there is a low voltage condition in the pump current trim circuit for the downstream oxygen sensor.

2. What are the common symptoms of code P22B6 in a 2016 Silverado?

Symptoms may include poor fuel efficiency, reduced engine performance, rough idling, and an illuminated check engine light.

3. What causes the P22B6 code to appear?

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

4. How can I diagnose the P22B6 code on my 2016 Silverado?

Start by inspecting the wiring and connectors for damage or corrosion, then test the downstream oxygen sensor for proper operation. Use a diagnostic scanner to check for related codes.

5. Can I still drive my 2016 Silverado with the P22B6 code?

While the truck may still be drivable, ignoring the issue can lead to poor engine performance and potential damage to the catalytic converter over time.

6. How do I fix the P22B6 code on a 2016 Chevrolet Silverado?

Repairs typically involve replacing the faulty downstream oxygen sensor, repairing damaged wiring, or reprogramming or updating the ECM if necessary.

7. How much does it cost to repair the P22B6 code?

Repair costs can vary, but replacing an oxygen sensor typically costs between $100 and $300, including labor. Wiring repairs or ECM updates may increase the cost.

8. Can a dirty or clogged catalytic converter cause the P22B6 code?

While unlikely, a clogged catalytic converter can affect exhaust flow and oxygen sensor readings, indirectly contributing to this code.

9. How do I prevent the P22B6 code from reappearing?

Regular maintenance, such as inspecting wiring and connectors and using high-quality fuel, can help prevent oxygen sensor and circuit issues.

10. Does the P22B6 code affect emissions?

Yes, a faulty oxygen sensor can lead to incorrect air-fuel mixture readings, increasing emissions and potentially causing the vehicle to fail an emissions test.