AutoCodes – Chevrolet – P0051 2015 Chevrolet Silverado

P0051 2015 Chevrolet Silverado Code - HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1

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 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0051 2015 Chevrolet Silverado indicates HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 558

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0051 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 a short to ground 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 P0051 2015 Chevrolet Silverado - HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1 - AutoCodes.com — P0051 2015 Chevrolet Silverado Code - HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0051 2015 Chevrolet Silverado?

Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted
Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection
Heated Oxygen Sensor Bank 2 Sensor 1 fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0051 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 P0051 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 P0051 2015 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0051 on a 2015 Chevrolet Silverado?

- Common symptoms include poor fuel efficiency, rough idling, engine stalling, and the illumination of the check engine light.

2. What does the OBDII code P0051 "HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1" mean for a 2015 Chevrolet Silverado?

- This code indicates that there is low voltage in the heater control circuit of the oxygen sensor located in bank 2, sensor 1.

3. What are the possible causes of OBDII code P0051 on a 2015 Chevrolet Silverado?

- Potential causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the engine control module (ECM).

4. How can I diagnose and repair OBDII code P0051 on a 2015 Chevrolet Silverado?

- Diagnosis involves checking the oxygen sensor, inspecting the wiring and connectors, testing the fuse, and scanning the ECM for any related issues. Repairs may involve replacing the oxygen sensor, repairing damaged wiring, or addressing ECM faults.

5. Can driving with OBDII code P0051 on a 2015 Chevrolet Silverado cause further damage?

- Continuing to drive with this fault can potentially lead to poor engine performance, decreased fuel efficiency, and damage to the catalytic converter over time. It is advisable to address the issue promptly.

6. How much does it typically cost to repair OBDII code P0051 on a 2015 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue and whether you choose to do the repair yourself or take it to a mechanic. Costs may range from around $100 for a DIY fix to several hundred dollars at a repair shop.

7. Is it safe to continue driving a 2015 Chevrolet Silverado with OBDII code P0051?

- While the vehicle may still be operable with this code present, it is recommended to address the issue as soon as possible to prevent potential damage to other engine components and ensure optimal performance.

8. Can a loose gas cap trigger OBDII code P0051 on a 2015 Chevrolet Silverado?

- While a loose gas cap can trigger the check engine light, it is not directly related to the specific code P0051, which is related to the oxygen sensor heater circuit in bank 2, sensor 1.

9. How can I prevent OBDII code P0051 from appearing on my 2015 Chevrolet Silverado?

- To prevent this code, it is essential to perform regular maintenance checks, including inspecting the oxygen sensors, ensuring proper wiring connections, and addressing any issues promptly to avoid further complications.

10. Will resetting the check engine light temporarily resolve OBDII code P0051 on a 2015 Chevrolet Silverado?

- Resetting the check engine light may temporarily turn it off, but if the underlying issue causing code P0051 is not addressed, the light is likely to come back on once the fault is detected again. It is best to diagnose and repair the problem to prevent it from reoccurring.