AutoCodes – Chevrolet – P0051 2018 Chevrolet Silverado

P0051 2018 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 2018 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 372

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 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 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 2018 Chevrolet Silverado - HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1 - AutoCodes.com — P0051 2018 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 2018 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 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 P0051 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 P0051 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0051 in a 2018 Chevrolet Silverado?

- Common symptoms of code P0051 include poor fuel economy, engine misfires, rough idling, and a noticeable decrease in engine performance.

2. What does the OBDII code P0051 on a 2018 Chevrolet Silverado indicate?

- OBDII code P0051 indicates a potential issue with the HO2S (Heated Oxygen Sensor) heater control circuit, specifically on Bank 2 Sensor 1, where the voltage is reading lower than normal.

3. What are the possible causes of OBDII code P0051 in a 2018 Chevrolet Silverado?

- Possible causes of code P0051 include a faulty HO2S Bank 2 Sensor 1, damaged wiring or connectors in the sensor circuit, a blown fuse, or issues with the engine control module (ECM).

4. How can I diagnose the OBDII code P0051 in my 2018 Chevrolet Silverado?

- To diagnose code P0051, you can use an OBDII scanner to read the code, inspect the wiring and connectors of Bank 2 Sensor 1, check the sensor's resistance, and test the related fuses for continuity.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P0051?

- It is not recommended to continue driving with code P0051 as it can lead to decreased fuel efficiency and potential damage to the catalytic converter over time. It is advised to address the issue promptly.

6. How can I repair OBDII code P0051 on my 2018 Chevrolet Silverado?

- Repairing code P0051 typically involves replacing the HO2S Bank 2 Sensor 1, repairing any damaged wiring or connectors, checking and replacing blown fuses if necessary, and clearing the error code.

7. Is it possible to reset the OBDII code P0051 in a 2018 Chevrolet Silverado without fixing the issue?

- While you can clear the error code using an OBDII scanner, it is crucial to address the underlying problem causing code P0051 to prevent further issues and ensure optimal engine performance.

8. Will fixing OBDII code P0051 in my 2018 Chevrolet Silverado improve fuel efficiency?

- Yes, resolving code P0051 by repairing or replacing the faulty components can help restore proper oxygen sensor functionality, leading to improved fuel efficiency and overall engine performance.

9. Can extreme weather conditions affect the occurrence of OBDII code P0051 in a 2018 Chevrolet Silverado?

- Extreme weather conditions can potentially impact the operation of the HO2S heater, which may contribute to the triggering of code P0051. It is essential to consider environmental factors during diagnosis and repair.

10. How often should the oxygen sensors be inspected in a 2018 Chevrolet Silverado to prevent OBDII code P0051?

- It is advisable to have the oxygen sensors inspected during regular maintenance intervals or if you notice any symptoms of poor engine performance to help prevent issues like code P0051 from occurring.