P2271 GMC - HO2S Signal Stuck Rich Bank 1 Sensor 2

Repair Importance Level: 2/3
Repair Difficulty Level: 2/3   
Comments  |  Add Comment

P2271 GMC Possible Causes

  • Faulty Rear Heated Oxygen Sensor Bank 1
  • Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
  • Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
  • Intake air leaks
  • Exhaust gas leaks
  • Inappropriate fuel pressure
  • Faulty fuel injectors

First diagnose P2271 GMC code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

Cost of diagnosing the P2271 GMC code

    Labor: 1.0

    The cost of diagnosing the P2271 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the P2271 GMC code detected?

The Powertrain Control Module (PCM) detected the HO2S12 sensor has reported a rich condition for an extended period during an intrusive test

P2271 GMC Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • High Fuel Consumption
  • Excessive Smoke from Exhaust

P2271 Gmc Description

The Powertrain Control Module (PCM) supplies a voltage of about 450 mV between the HO2S high and low signal circuits. The oxygen sensor varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is lean.

The PCM monitors and stores the heated oxygen sensor (HO2S) voltage information. The PCM evaluates the HO2S voltage samples in order to determine the amount of time the HO2S voltage was out of range. The PCM compares the stored HO2S voltage samples taken within each sample period and determines if majority of the samples are out of the operating range.

OBDII Code P2271 Gmc - HO2S Signal Stuck Rich Bank 1 Sensor 2 - AutoCodes.com

P2271 GMC More Information

Need more information on how to fix the P2271 GMC code?
Get Access to Factory Service Manuals

Need more help?

Get the P2271 Gmc code diagnosed by a professional: Find a repair shop in your area

Related Information

P2271 GMC Comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P2271 Gmc code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧