P2273 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado?
- 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 2015 Chevrolet Silverado?
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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado Code
What does the OBDII code P2273 mean on a 2015 Chevrolet Silverado?
P2273 indicates that the downstream oxygen sensor (Bank 2, Sensor 2) has detected a consistently rich air-fuel mixture, meaning there is too much fuel or insufficient oxygen in the exhaust gases.
What are the common symptoms of code P2273 in a Chevrolet Silverado?
Common symptoms include a check engine light, reduced fuel efficiency, increased emissions, and possible rough idling or poor engine performance.
What causes the P2273 code to appear?
Potential causes include a faulty downstream oxygen sensor, exhaust leaks, a malfunctioning fuel injector, a clogged air filter, or issues with the engine control module (ECM).
How do I know which sensor is affected by the P2273 code?
The code refers to Bank 2 (the side of the engine opposite Cylinder 1) and Sensor 2, which is the oxygen sensor located downstream of the catalytic converter.
Can a bad catalytic converter trigger the P2273 code?
Yes, a failing or clogged catalytic converter can cause the downstream O2 sensor to read a rich condition and trigger the P2273 code.
Is it safe to drive with the P2273 code on my 2015 Silverado?
While the vehicle may still be drivable, ignoring the code can lead to worsened fuel efficiency, increased emissions, and potential damage to the catalytic converter over time.
How is the P2273 code diagnosed?
A mechanic will use an OBDII scanner to confirm the code, inspect the downstream oxygen sensor and wiring, check for exhaust leaks, and evaluate the fuel system and air intake components.
Can I fix the P2273 code myself?
If you have basic automotive knowledge, you can inspect for obvious issues like damaged wiring, a clogged air filter, or exhaust leaks. However, advanced diagnostics or sensor replacement may require professional help.
How much does it cost to repair the P2273 code?
Repair costs vary depending on the cause. Replacing a downstream oxygen sensor typically costs $150–$300, while catalytic converter repairs or fuel system work can be more expensive.
Will clearing the P2273 code solve the problem?
Clearing the code will turn off the check engine light temporarily, but if the underlying issue isn’t fixed, the code will reappear. Proper diagnosis and repair are necessary.
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