P0155 2015 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 2015 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.
Code P0155 2015 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 heater current is out of factory specifications.
What are the Possible Causes of the DTC P0155 2015 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 2015 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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0155 2015 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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Frequently Asked Questions about P0155 2015 GMC Sierra Code
1. What does the OBDII code P0155 mean for a 2015 GMC Sierra?
P0155 indicates an issue with the heater circuit of the oxygen sensor (HO2S) located on Bank 2, Sensor 1. The sensor's heater is not functioning properly.
2. What are the symptoms of code P0155 on a 2015 GMC Sierra?
Common symptoms include the Check Engine Light turning on, reduced fuel efficiency, possible rough engine idle, and increased vehicle emissions.
3. What causes the P0155 code to appear on a 2015 GMC Sierra?
The code can be caused by a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, a blown fuse, or issues with the engine control module (ECM).
4. How do I diagnose the P0155 code on my 2015 GMC Sierra?
Start by visually inspecting the wiring and connectors for damage. Use a multimeter to test the oxygen sensor’s heater circuit for continuity, and check related fuses for any signs of failure.
5. Can a P0155 code affect fuel efficiency in a 2015 GMC Sierra?
Yes, a malfunctioning oxygen sensor heater can lead to improper air-fuel mixture adjustments, reducing fuel efficiency.
6. Is it safe to drive with a P0155 code on a 2015 GMC Sierra?
While the vehicle may still drive, it is not recommended as the engine may run inefficiently, cause higher emissions, and potentially lead to further damage over time.
7. How do I fix the P0155 code on a 2015 GMC Sierra?
Repairs may include replacing the faulty oxygen sensor, repairing damaged wiring, replacing a blown fuse, or addressing issues with the ECM.
8. How much does it cost to fix the P0155 code on a 2015 GMC Sierra?
Repair costs can vary but typically range from $150 to $300, depending on whether the oxygen sensor or wiring needs replacement.
9. Can a dirty oxygen sensor cause the P0155 code on a 2015 GMC Sierra?
No, this code specifically refers to a problem with the sensor’s heater circuit, not contamination of the sensor itself.
10. How can I prevent the P0155 code from reoccurring on my 2015 GMC Sierra?
Regularly inspect and maintain the oxygen sensor wiring and connections, and ensure the vehicle’s electrical system is in good condition.
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