P0155 2018 GMC Sierra Code - HO2S Heater Performance Bank 2 Sensor 1
Quick Answer
The P0155 diagnostic trouble code (DTC) indicates an issue with the heater performance of the oxygen sensor (O2 sensor) located in Bank 2 Sensor 1 of a 2018 GMC Sierra. Common causes include Faulty O2 sensor heater element, Wiring or connector issues in the O2 sensor circuit, ECM software or hardware problems. 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 2018 GMC Sierra indicates HO2S Heater Performance Bank 2 Sensor 1.
- Common causes
- Common causes include Faulty O2 sensor heater element, Wiring or connector issues in the O2 sensor circuit, ECM software or hardware problems.
- 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 P0155 2018 GMC Sierra Description
The P0155 diagnostic trouble code (DTC) indicates an issue with the heater performance of the oxygen sensor (O2 sensor) located in Bank 2 Sensor 1 of a 2018 GMC Sierra. The O2 sensor is responsible for measuring the oxygen content in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater element in the sensor is essential for reaching operating temperature quickly, especially during cold start conditions, to improve accuracy and efficiency.
Common Causes of P0155 2018 GMC Sierra
- Faulty O2 sensor heater element
- Wiring or connector issues in the O2 sensor circuit
- ECM software or hardware problems
- Engine coolant temperature sensor malfunction
- Exhaust leaks near the O2 sensor
Symptoms of P0155 2018 GMC Sierra
- Check Engine Light illuminated on the dashboard
- Decreased fuel efficiency
- Rough idling or stalling
- Hesitation or lack of power during acceleration
- Increased emissions
How to Fix P0155 2018 GMC Sierra
- Diagnose the issue using a scan tool to confirm the P0155 code and check the O2 sensor's heater circuit.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as needed.
- Test the O2 sensor heater element for continuity and resistance, replacing if defective.
- Check the ECM for any software updates or malfunctions, addressing as required.
- Clear the code, reset the ECM, and conduct a road test to verify the repair and ensure the code does not return.
Cost to Fix P0155 2018 GMC Sierra
The cost of repairing a P0155 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair cost for this type of problem can range from $150 to $400, including parts and labor. Keep in mind that diagnostic time and hourly labor rates can impact the final cost, so it's advisable to get a quote from a trusted auto repair shop before proceeding with the repair.
Tech Notes for P0155 2018 GMC Sierra
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