AutoCodes – Chevrolet – P0155 Chevrolet

P0155 Chevrolet 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 Chevrolet 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 61,106

How popular is this code, among other codes? Medium

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 23, 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 Chevrolet 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 Chevrolet - HO2S Heater Performance Bank 2 Sensor 1 - AutoCodes.com — P0155 Chevrolet Code - HO2S Heater Performance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 Chevrolet?

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 Chevrolet?

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.
1998 Chevy Tahoe Check Engine Light & Code P0155

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0155 Chevrolet 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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Information for Specific Chevrolet Models

P0155 2014 Chevrolet Silverado — HO2S Heater Performance Bank 2 Sensor 1
P0155 2015 Chevrolet Silverado — HO2S Heater Performance Bank 2 Sensor 1
P0155 2016 Chevrolet Silverado — HO2S Heater Performance Bank 2 Sensor 1
P0155 2017 Chevrolet Silverado — HO2S Heater Performance Bank 2 Sensor 1
P0155 2018 Chevrolet Silverado — HO2S Heater Performance Bank 2 Sensor 1

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 Chevrolet Code

1. What does the OBDII code P0155 Chevrolet indicate?

The code P0155 indicates a problem with the HO2S (Heated Oxygen Sensor) heater performance on Bank 2 Sensor 1 in a Chevrolet vehicle.

2. What are the common symptoms of a P0155 Chevrolet code?

Common symptoms of a P0155 code include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light.

3. What are the possible causes of a P0155 Chevrolet code?

Possible causes of a P0155 code 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 a P0155 Chevrolet code?

Diagnosing a P0155 code involves checking the oxygen sensor's heater circuit for continuity, inspecting the sensor's wiring and connectors for damage, and testing the sensor's heater resistance.

5. Can I drive my Chevrolet with a P0155 code?

It is not recommended to drive your Chevrolet with a P0155 code, as it can lead to decreased fuel efficiency and potential damage to the engine over time.

6. How can I repair a P0155 Chevrolet code?

Repairing a P0155 code may involve replacing the faulty oxygen sensor, repairing damaged wiring or connectors, replacing blown fuses, or addressing any underlying ECM issues.

7. How much does it cost to fix a P0155 Chevrolet code?

The cost of fixing a P0155 code can vary depending on the exact cause of the issue, but it typically ranges from $100 to $300 for parts and labor.

8. Can I reset the P0155 code on my Chevrolet without fixing the issue?

While you can clear the code using an OBDII scanner, it is important to address the underlying problem causing the P0155 code to prevent further issues with your vehicle.

9. How long does it take to repair a P0155 Chevrolet code?

The repair time for a P0155 code can vary depending on the exact cause of the issue and the expertise of the mechanic, but it typically takes around 1-2 hours to complete.

10. Are there any preventative measures to avoid a P0155 Chevrolet code?

To prevent a P0155 code, it is recommended to perform regular maintenance on your vehicle, such as checking and replacing oxygen sensors as needed, and addressing any engine performance issues promptly.