AutoCodes – Chevrolet – P0056 Chevrolet

P0056 Chevrolet Code - HO2S Heater Control Circuit Bank 2 Sensor 2

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2, Heated Oxygen Sensor Bank 2 Sensor 2 harness is open shorted, Heated Oxygen Sensor Bank 2 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: P0056 Chevrolet indicates HO2S Heater Control Circuit Bank 2 Sensor 2.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2, Heated Oxygen Sensor Bank 2 Sensor 2 harness is open shorted, Heated Oxygen Sensor Bank 2 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 10,251

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0056 Chevrolet Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects an open circuit in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 5 s.

OBDII Code P0056 Chevrolet - HO2S Heater Control Circuit Bank 2 Sensor 2 - AutoCodes.com — P0056 Chevrolet Code - HO2S Heater Control Circuit Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0056 Chevrolet?

Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2
Heated Oxygen Sensor Bank 2 Sensor 2 harness is open shorted
Heated Oxygen Sensor Bank 2 Sensor 2 circuit poor electrical connection
Heated Oxygen Sensor Bank 2 Sensor 2 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0056 Chevrolet?

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 does this mean?

Code Tech Notes

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0056 Chevrolet 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.

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Information for Specific Chevrolet Models

P0056 2014 Chevrolet Silverado — HO2S Heater Control Circuit Bank 2 Sensor 2
P0056 2015 Chevrolet Silverado — HO2S Heater Control Circuit Bank 2 Sensor 2
P0056 2016 Chevrolet Silverado — HO2S Heater Control Circuit Bank 2 Sensor 2
P0056 2017 Chevrolet Silverado — HO2S Heater Control Circuit Bank 2 Sensor 2
P0056 2018 Chevrolet Silverado — HO2S Heater Control Circuit Bank 2 Sensor 2

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 P0056 Chevrolet Code

1. What does the OBDII code P0056 for a Chevrolet indicate?

The code P0056 refers to a malfunction in the HO2S Heater Control Circuit for Bank 2 Sensor 2, which is the oxygen sensor downstream of the catalytic converter on the second bank of cylinders in a Chevrolet vehicle.

2. What are the common symptoms of a P0056 trouble code in a Chevrolet?

Common symptoms of a P0056 code in a Chevrolet include poor fuel economy, rough idling, stalling, increased emissions, and the illumination of the check engine light on the dashboard.

3. What are the possible causes of a P0056 code in a Chevrolet?

The P0056 code in a Chevrolet can be triggered by issues such as a faulty HO2S sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or a problem with the engine control module (ECM).

4. How can I diagnose a P0056 code in my Chevrolet?

Diagnosing a P0056 code involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors for damage, checking the HO2S sensor for proper operation, and testing the related fuses and ECM for faults.

5. Can I continue driving my Chevrolet with a P0056 trouble code?

While it may be possible to drive your Chevrolet with a P0056 code, it is not recommended as it can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

6. How can I repair a P0056 code in my Chevrolet?

To repair a P0056 code in a Chevrolet, you may need to replace the HO2S sensor, repair any damaged wiring or connectors, replace blown fuses, or reprogram the engine control module (ECM) if necessary.

7. Is it possible to reset a P0056 trouble code in a Chevrolet without fixing the underlying issue?

Resetting a P0056 trouble code without addressing the root cause is not recommended, as the issue will likely resurface and could lead to further problems with the vehicle's performance and emissions.

8. Can a DIY enthusiast fix a P0056 code in a Chevrolet?

While some DIY enthusiasts may be able to diagnose and repair a P0056 code in a Chevrolet themselves, it is recommended to have the necessary tools, knowledge, and experience to work on the vehicle's electrical systems safely and effectively.

9. How much does it cost to repair a P0056 code in a Chevrolet at a mechanic or dealership?

The cost of repairing a P0056 code in a Chevrolet can vary depending on the specific cause of the issue, the labor rates of the mechanic or dealership, and the cost of any replacement parts needed, but it typically ranges from $100 to $300 or more.

10. How often does the P0056 code occur in Chevrolet vehicles?

The P0056 code can occur in Chevrolet vehicles as a result of various factors, such as age, mileage, and maintenance history, but it is not considered a common trouble code compared to some other OBDII codes.