P2273 2016 GMC Sierra Code - HO2S Signal Stuck Rich Bank 2 Sensor 2
Quick Answer
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Bank 2 Sensor 2, Heated Oxygen Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Bank 2 Sensor 2 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
- P2273 2016 GMC Sierra indicates HO2S Signal Stuck Rich Bank 2 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Bank 2 Sensor 2, Heated Oxygen Bank 2 Sensor 2 harness is open or shorted, Heated Oxygen Bank 2 Sensor 2 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 P2273 2016 GMC Sierra Description
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM does not detect an HO2S voltage less than 100 mV before accumulated mass airflow exceeds a calibrated value.
What are the Possible Causes of the DTC P2273 2016 GMC Sierra?
- Faulty Heated Oxygen Bank 2 Sensor 2
- Heated Oxygen Bank 2 Sensor 2 harness is open or shorted
- Heated Oxygen Bank 2 Sensor 2 circuit poor electrical connection
- Low or high fuel system pressure
- Fuel contamination
- Faulty fuel injectors
- Exhaust gas leaks
- Engine vacuum leaks
How to Fix the DTC P2273 2016 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
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What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2273 2016 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 P2273 2016 GMC Sierra Code
What does the OBDII code P2273 mean on a 2016 GMC Sierra?
P2273 indicates that the oxygen sensor (HO2S) on Bank 2 Sensor 2 has detected a consistently rich air-fuel mixture.
What are the symptoms of code P2273 in a 2016 GMC Sierra?
Symptoms may include illuminated check engine light, reduced fuel efficiency, poor engine performance, and a strong fuel smell from the exhaust.
What causes the P2273 code on a 2016 GMC Sierra?
Common causes include a faulty downstream oxygen sensor, fuel injector issues, a leaking fuel pressure regulator, or an exhaust leak near the sensor.
Can a dirty air filter cause a P2273 code?
A dirty air filter is unlikely to cause this code directly, but it may contribute to poor air-fuel balance, which could exacerbate the issue.
How is the P2273 code diagnosed?
A technician will use a scan tool to check live data, inspect the oxygen sensor for proper function, and look for exhaust or fuel system issues.
Can I drive my 2016 GMC Sierra with a P2273 code?
While the truck may still be drivable, prolonged operation can lead to further damage to the catalytic converter and reduced performance.
How do you fix a P2273 code on a 2016 GMC Sierra?
Repairs may involve replacing the Bank 2 Sensor 2 oxygen sensor, fixing exhaust leaks, repairing fuel system issues, or updating the engine control module (ECM).
Is a P2273 code covered under warranty for a 2016 GMC Sierra?
It depends on the vehicle’s warranty coverage and mileage. Emissions-related components may still be covered under federal emissions warranties.
How much does it cost to fix a P2273 code on a 2016 GMC Sierra?
The repair cost can range from $150 to $400 or more, depending on whether the oxygen sensor or other components need to be replaced.
Will a P2273 code cause a failed emissions test?
Yes, a P2273 code will likely cause your vehicle to fail an emissions test due to improper air-fuel mixture monitoring.
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