AutoCodes – Chevrolet – P0155 2017 Chevrolet Silverado

P0155 2017 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 2017 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 564

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 2017 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 2017 Chevrolet Silverado - HO2S Heater Performance Bank 2 Sensor 1 - AutoCodes.com — P0155 2017 Chevrolet Silverado Code - HO2S Heater Performance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 2017 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 2017 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 2017 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 P0155 2017 Chevrolet Silverado Code

What does the P0155 code mean for a 2017 Chevrolet Silverado?

Code P0155 indicates an issue with the heater circuit in the oxygen sensor (HO2S) located on Bank 2 Sensor 1. The sensor is responsible for monitoring the air-fuel ratio in the exhaust stream.

What are the symptoms of code P0155 in a 2017 Silverado?

Common symptoms include poor fuel economy, rough idle, reduced engine performance, and the check engine light illuminating.

What causes a P0155 code in a 2017 Chevrolet Silverado?

The main causes are a faulty Bank 2 Sensor 1 oxygen sensor, damaged wiring or connectors in the sensor’s heater circuit, or issues with the vehicle’s powertrain control module (PCM).

Can I drive my 2017 Silverado with a P0155 code?

While the vehicle may still be drivable, ignoring the code can lead to poor fuel efficiency, potential damage to the catalytic converter, and other long-term engine issues.

How do I diagnose the P0155 code?

Start by inspecting the wiring and connectors for Bank 2 Sensor 1 for damage or corrosion. Use a multimeter to check the sensor's heater circuit for proper voltage and resistance. If needed, perform a live data scan using an OBDII scanner.

How do I fix code P0155 on a 2017 Chevrolet Silverado?

Common fixes include replacing the faulty oxygen sensor (Bank 2 Sensor 1), repairing damaged wiring, or replacing blown fuses related to the heater circuit.

Where is Bank 2 Sensor 1 located on a 2017 Chevy Silverado?

Bank 2 Sensor 1 is located on the exhaust system upstream of the catalytic converter on the side of the engine with cylinder 2.

How much does it cost to repair a P0155 code?

Replacing the oxygen sensor typically costs $150-$300, including parts and labor, depending on your location and the shop's rates.

Can a bad PCM cause a P0155 code?

While rare, a malfunctioning PCM can fail to regulate the heater circuit properly, leading to a P0155 code.

How can I prevent a P0155 code from occurring again?

Regular maintenance, including inspecting oxygen sensor wiring and connectors and addressing exhaust system issues promptly, can help prevent this code from recurring.