AutoCodes – Chevrolet – P0051 2016 Chevrolet Silverado

P0051 2016 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 2016 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 382

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 2016 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 2016 Chevrolet Silverado - HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1 - AutoCodes.com — P0051 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado Code

1. What does the OBDII code P0051 for a 2016 Chevrolet Silverado mean?

The code P0051 indicates a potential issue with the HO2S (Heated Oxygen Sensor) Heater Control Circuit on Bank 2 Sensor 1, specifically low voltage detected.

2. What are the common symptoms of OBDII code P0051 in a 2016 Chevrolet Silverado?

Common symptoms of code P0051 can include poor fuel economy, rough idling, engine misfires, and an illuminated check engine light on the dashboard.

3. What can cause the OBDII code P0051 to trigger in a 2016 Chevrolet Silverado?

Possible causes of code P0051 include a faulty HO2S sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or a problem with the engine control module (ECM).

4. How do I diagnose the OBDII code P0051 in my 2016 Chevrolet Silverado?

Diagnosing code P0051 typically involves testing the HO2S sensor and its heater circuit using a multimeter, checking the wiring for any damage, inspecting the fuse related to the sensor, and scanning the ECM for any additional fault codes.

5. Can I continue driving my 2016 Chevrolet Silverado with the P0051 trouble code?

It is not recommended to continue driving with a persistent P0051 code as it can lead to decreased fuel efficiency and potential long-term damage to the engine and catalytic converter.

6. How can I repair the OBDII code P0051 on my 2016 Chevrolet Silverado?

Common repair options for code P0051 include replacing the faulty HO2S sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, and resetting the ECM after repairs are completed.

7. Is it possible to prevent the OBDII code P0051 from appearing in my 2016 Chevrolet Silverado?

Regular maintenance and timely replacement of oxygen sensors can help prevent code P0051 from appearing. Ensuring proper wiring connections and avoiding harsh driving conditions can also contribute to preventing this issue.

8. Can a DIY enthusiast fix the OBDII code P0051 in a 2016 Chevrolet Silverado?

While some aspects of diagnosing and repairing code P0051 can be done by DIY enthusiasts with the right tools and knowledge, complex electrical issues or sensor replacements may require professional assistance.

9. Will resetting the check engine light resolve the OBDII code P0051 in a 2016 Chevrolet Silverado?

Simply resetting the check engine light without addressing the underlying issue causing code P0051 will not resolve the problem. It is essential to diagnose the root cause and perform necessary repairs to clear the code.

10. How long does it typically take to repair the OBDII code P0051 in a 2016 Chevrolet Silverado?

The time needed to repair code P0051 can vary depending on the exact cause of the issue and the availability of parts. Simple fixes like replacing a fuse may take a short time, while more complex repairs could require several hours or a day.