AutoCodes – Chevrolet – P0155 2018 Chevrolet Silverado

P0155 2018 Chevrolet Silverado Code - HO2S Heater Performance 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: P0155 2018 Chevrolet Silverado indicates HO2S Heater Performance 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 432

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 P0155 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 that the HO2S 1 heater current is out of factory specifications.

OBDII Code P0155 2018 Chevrolet Silverado - HO2S Heater Performance Bank 2 Sensor 1 - AutoCodes.com — P0155 2018 Chevrolet Silverado Code - HO2S Heater Performance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 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 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0155 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 P0155 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.

Need more information about the P0155 2018 Chevrolet Silverado code?

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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 P0155 2018 Chevrolet Silverado Code

1. What does the OBDII code P0155 on a 2018 Chevrolet Silverado mean?

The code P0155 indicates a fault with the HO2S (Heated Oxygen Sensor) Heater Performance on Bank 2 Sensor 1 in the 2018 Chevrolet Silverado.

2. What are the common symptoms of OBDII code P0155 in a 2018 Chevrolet Silverado?

Common symptoms of code P0155 include poor fuel economy, rough idling, engine misfires, and the illumination of the Check Engine Light.

3. What are the possible causes of OBDII code P0155 in a 2018 Chevrolet Silverado?

Possible causes of code P0155 in a 2018 Chevrolet Silverado include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or an issue with the engine control module.

4. How can I diagnose the OBDII code P0155 on my 2018 Chevrolet Silverado?

Diagnosing code P0155 involves checking the wiring and connectors for damage, testing the oxygen sensor heater circuit resistance, and inspecting the fuse related to the oxygen sensor heater.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P0155?

It is generally not recommended to drive with code P0155 present, as it can lead to poor engine performance and potentially cause damage to the catalytic converter over time.

6. How can I repair OBDII code P0155 on my 2018 Chevrolet Silverado?

Repairing code P0155 may involve replacing the oxygen sensor, repairing damaged wiring or connectors, replacing a blown fuse, or reprogramming the engine control module if necessary.

7. Is it possible to reset OBDII code P0155 on a 2018 Chevrolet Silverado?

While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. How much does it cost to fix OBDII code P0155 on a 2018 Chevrolet Silverado?

The cost of fixing code P0155 can vary depending on the specific cause of the issue, but it typically ranges from $200 to $500 for parts and labor.

9. What is the purpose of the HO2S Heater in the OBDII system of a 2018 Chevrolet Silverado?

The HO2S Heater is designed to quickly bring the oxygen sensor up to operating temperature to improve its accuracy in measuring the oxygen levels in the exhaust gases.

10. Can a DIY enthusiast repair OBDII code P0155 on a 2018 Chevrolet Silverado?

While some aspects of diagnosing and repairing code P0155 can be tackled by a knowledgeable DIY enthusiast, it may require specialized tools and expertise, so professional assistance is often recommended.