AutoCodes – GMC – P0155 2014 GMC Sierra

P0155 2014 GMC Sierra 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 2014 GMC Sierra 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 195

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 2014 GMC Sierra 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 2014 GMC Sierra - HO2S Heater Performance Bank 2 Sensor 1 - AutoCodes.com — P0155 2014 GMC Sierra Code - HO2S Heater Performance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0155 2014 GMC Sierra?

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 2014 GMC Sierra?

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 2014 GMC Sierra 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 2014 GMC Sierra Code

1. What does OBDII code P0155 for a 2014 GMC Sierra indicate?

Code P0155 for a 2014 GMC Sierra refers to HO2S Heater Performance Bank 2 Sensor 1, signaling an issue with the oxygen sensor heater circuit in bank 2, sensor 1.

2. What are the common symptoms of OBDII code P0155 in a 2014 GMC Sierra?

Common symptoms of code P0155 in a 2014 GMC Sierra may 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 2014 GMC Sierra?

The causes of OBDII code P0155 in a 2014 GMC Sierra can range from a faulty oxygen sensor, damaged wiring or connectors, to issues with the vehicle's computer or the sensor's internal heater circuit.

4. How can I diagnose OBDII code P0155 in a 2014 GMC Sierra?

Diagnosing code P0155 involves using an OBDII scanner to retrieve the code, checking the oxygen sensor and its connections for visible damage, and testing the sensor's heater circuit for proper functioning.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P0155?

It is not recommended to drive your 2014 GMC Sierra with code P0155 unresolved, as it can lead to reduced fuel efficiency, engine performance issues, and potential damage to the catalytic converter over time.

6. How should I repair OBDII code P0155 in a 2014 GMC Sierra?

Repairing code P0155 may involve replacing the oxygen sensor in bank 2, sensor 1, repairing or replacing damaged wiring or connectors, or addressing any issues with the sensor's internal heater circuit.

7. Is it possible to reset OBDII code P0155 in a 2014 GMC Sierra without repair?

While you can clear the Check Engine Light associated with code P0155 using an OBDII scanner, the code is likely to return if the underlying issue causing the fault is not addressed.

8. Are there any DIY tips for fixing OBDII code P0155 in a 2014 GMC Sierra?

DIY tips for addressing code P0155 include checking and cleaning the oxygen sensor connections, ensuring proper wiring integrity, and replacing the sensor if necessary following manufacturer guidelines.

9. Can a mechanic help with diagnosing and repairing OBDII code P0155 in a 2014 GMC Sierra?

Yes, a qualified mechanic can assist in diagnosing the root cause of code P0155 using specialized tools and expertise, as well as performing the necessary repairs to resolve the issue effectively.

10. How much can I expect to pay to fix OBDII code P0155 in a 2014 GMC Sierra?

Repair costs for code P0155 in a 2014 GMC Sierra can vary based on the exact cause of the issue, but expenses typically include parts and labor, with total costs ranging from $100 to $400 or more depending on the repairs needed.