AutoCodes – Chevrolet – P0056 2014 Chevrolet Silverado

P0056 2014 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 2014 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 706

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 2014 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 2014 Chevrolet Silverado - HO2S Heater Control Circuit Bank 2 Sensor 2 - AutoCodes.com — P0056 2014 Chevrolet Silverado Code - HO2S Heater Control Circuit Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0056 2014 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 2014 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 2014 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 2014 Chevrolet Silverado Code

1. What does the OBDII code P0056 mean on a 2014 Chevrolet Silverado?

P0056 indicates an issue with the Heater Control Circuit for the Bank 2 Sensor 2 oxygen sensor, which monitors the exhaust gases after the catalytic converter on the passenger side of the engine.

2. What are the symptoms of code P0056 in a 2014 Chevrolet Silverado?

Common symptoms include an illuminated Check Engine Light, reduced fuel efficiency, and potentially a longer warm-up time for the oxygen sensor, though drivability issues are rare.

3. What causes the P0056 code to appear?

Possible causes include a failed oxygen sensor heater element, damaged wiring or connectors in the heater circuit, a blown fuse, or a malfunctioning powertrain control module (PCM).

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

Start by inspecting the wiring and connectors for damage or corrosion. Then, test the resistance of the oxygen sensor heater circuit and check for a blown fuse. Use a scan tool to monitor the heater circuit performance.

5. Can I drive my 2014 Silverado with the P0056 code?

Yes, you can drive with this code, but it may lead to reduced fuel efficiency and could impact emissions performance. Itâ€™s best to address the issue promptly.

6. How do I fix the P0056 code on a 2014 Chevrolet Silverado?

Repairs may include replacing the Bank 2 Sensor 2 oxygen sensor, fixing damaged wiring or connectors, replacing a blown fuse, or, in rare cases, reprogramming or replacing the PCM.

7. Where is Bank 2 Sensor 2 located on a 2014 Chevrolet Silverado?

Bank 2 Sensor 2 is located on the passenger side of the exhaust system, after the catalytic converter.

8. How much does it cost to repair the P0056 code on a Silverado?

The cost depends on the repair. Replacing an oxygen sensor typically costs between $150 and $300, while wiring repairs or PCM replacement may vary significantly.

9. What tools are needed to fix the P0056 code?

You may need a multimeter to test resistance, a scan tool to monitor the O2 sensor heater circuit, and basic hand tools to replace the sensor or repair wiring.

10. Will clearing the P0056 code fix the problem?

Clearing the code will turn off the Check Engine Light temporarily, but the issue will return unless the underlying problem is resolved.