AutoCodes – Chevrolet – P0056 2018 Chevrolet Silverado

P0056 2018 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 2018 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 408

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 2018 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 2018 Chevrolet Silverado - HO2S Heater Control Circuit Bank 2 Sensor 2 - AutoCodes.com — P0056 2018 Chevrolet Silverado Code - HO2S Heater Control Circuit Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0056 2018 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 2018 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 2018 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 2018 Chevrolet Silverado Code

1. What does the OBDII code P0056 mean on a 2018 Chevrolet Silverado?

The P0056 code indicates a problem with the heater control circuit for the oxygen sensor on Bank 2 Sensor 2, which is responsible for heating the sensor to ensure accurate readings.

2. What are the symptoms of code P0056 on a 2018 Chevrolet Silverado?

Symptoms may include an illuminated check engine light, increased fuel consumption, poor engine performance, or difficulty passing emissions tests.

3. What causes the P0056 code to appear on a 2018 Chevrolet Silverado?

Common causes include a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a malfunctioning engine control module (ECM).

4. How do I diagnose the P0056 code on a 2018 Chevrolet Silverado?

Start by checking the oxygen sensor wiring and connectors for damage, test the heating element in Bank 2 Sensor 2 with a multimeter, and verify voltage supply to the circuit.

5. Can I drive my 2018 Chevrolet Silverado with the P0056 code?

While it may be safe to drive for a short time, ignoring the issue can lead to reduced fuel efficiency, increased emissions, and further damage to the engine or catalytic converter.

6. How do I fix the P0056 code on a 2018 Chevrolet Silverado?

Repairs may include replacing the oxygen sensor, repairing damaged wiring or connectors, replacing a blown fuse, or reprogramming/repairing the ECM if necessary.

7. How much does it cost to fix the P0056 code on a 2018 Chevrolet Silverado?

The repair cost can range from $100 to $300, depending on whether the oxygen sensor, wiring, or ECM needs to be repaired or replaced.

8. Where is Bank 2 Sensor 2 located on a 2018 Chevrolet Silverado?

Bank 2 refers to the side of the engine opposite the cylinder with the #1 spark plug, and Sensor 2 is located downstream of the catalytic converter on that side.

9. Could a blown fuse cause the P0056 code on a 2018 Chevrolet Silverado?

Yes, a blown fuse in the oxygen sensor heater circuit could interrupt power supply and trigger the P0056 code.

10. How can I prevent the P0056 code from reoccurring on my 2018 Chevrolet Silverado?

Regularly inspect and maintain the oxygen sensor wiring and connectors, address engine issues promptly, and ensure proper voltage supply to the sensor heater circuit.