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Engine-Codes – GMC – P0155 2014 GMC Sierra

P0155 2014 GMC Sierra Code - HO2S Heater Performance Bank 2 Sensor 1

Quick Answer

The P0155 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the HO2S (Heated Oxygen Sensor) Heater Performance on Bank 2 Sensor 1. Common causes include Faulty oxygen sensor heater, Damaged wiring or connectors, Blown fuse. 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 oxygen sensor heater, Damaged wiring or connectors, Blown fuse.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0155 2014 GMC Sierra Description

The P0155 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the HO2S (Heated Oxygen Sensor) Heater Performance on Bank 2 Sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and sending this information to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater element in the sensor helps it reach operating temperature quickly, allowing it to provide accurate readings sooner.

OBDII Code P0155 2014 GMC Sierra - HO2S Heater Performance Bank 2 Sensor 1
P0155 2014 GMC Sierra Code - HO2S Heater Performance Bank 2 Sensor 1

Common Causes of P0155 2014 GMC Sierra

  1. Faulty oxygen sensor heater
  2. Damaged wiring or connectors
  3. Blown fuse
  4. ECM malfunction
  5. Exhaust leaks near the sensor

Symptoms of P0155 2014 GMC Sierra

  1. Decreased fuel efficiency
  2. Rough idling
  3. Hesitation during acceleration
  4. Increased emissions
  5. Check Engine Light illuminated

How to Fix P0155 2014 GMC Sierra

  1. Use a scan tool to confirm the P0155 code and identify the specific oxygen sensor causing the issue.
  2. Inspect the wiring and connectors for any damage or corrosion. Repair or replace as needed.
  3. Check the fuse related to the oxygen sensor heater circuit and replace if blown.
  4. Test the oxygen sensor heater using a multimeter to determine if it is functioning properly. Replace the sensor if necessary.
  5. Clear the code from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0155 2014 GMC Sierra

The cost of repairing a P0155 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing an oxygen sensor heater can range from $150 to $300, including parts and labor. However, additional costs may apply if wiring or connectors need to be repaired or if the ECM requires attention. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the individual circumstances of the vehicle. Keep in mind that labor rates can fluctuate based on location and the type of repair facility.

What does this mean?

Tech Notes for P0155 2014 GMC Sierra

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.

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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.

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