AutoCodes – Chevrolet – P0056 2015 Chevrolet Silverado

P0056 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 866

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 25, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0056 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado - HO2S Heater Control Circuit Bank 2 Sensor 2 - AutoCodes.com — P0056 2015 Chevrolet Silverado Code - HO2S Heater Control Circuit Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0056 2015 Chevrolet Silverado?

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 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 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0056 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.

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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 P0056 2015 Chevrolet Silverado Code

1. What does OBDII code P0056 on a 2015 Chevrolet Silverado mean?

- This code refers to a malfunction in the HO2S (Heated Oxygen Sensor) heater control circuit for Bank 2 Sensor 2.

2. What are the common symptoms of OBDII code P0056 on a 2015 Chevrolet Silverado?

- Common symptoms include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

3. What are the possible causes of OBDII code P0056 on a 2015 Chevrolet Silverado?

- Potential causes include a faulty HO2S heater, damaged wiring or connectors in the heater circuit, a blown heater fuse, or a problem with the PCM (Powertrain Control Module).

4. How can I diagnose OBDII code P0056 on a 2015 Chevrolet Silverado?

- Diagnosis involves using an OBDII scanner to retrieve the code, checking the wiring and connectors for damage, testing the HO2S heater, and inspecting the fuse related to the heater circuit.

5. Can I still drive my 2015 Chevrolet Silverado with OBDII code P0056?

- It is not recommended to drive the vehicle with this code present, as it can lead to poor engine performance and potential damage over time.

6. How do I repair OBDII code P0056 on a 2015 Chevrolet Silverado?

- Repair may involve replacing the faulty HO2S heater, repairing damaged wiring or connectors, replacing the blown fuse, or addressing any issues with the PCM.

7. Is it necessary to take my 2015 Chevrolet Silverado to a mechanic for OBDII code P0056?

- While some DIY enthusiasts may be able to address the issue themselves, it is advisable to consult a professional mechanic for an accurate diagnosis and proper repair.

8. How much does it typically cost to repair OBDII code P0056 on a 2015 Chevrolet Silverado?

- Repair costs can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can OBDII code P0056 on a 2015 Chevrolet Silverado cause damage if left untreated?

- Ignoring this code can lead to decreased fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

10. How long does it usually take to repair OBDII code P0056 on a 2015 Chevrolet Silverado?

- The repair time can vary based on the exact cause of the problem and the availability of parts, but it typically takes a few hours to complete the repair.