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P2247 OBD-II Trouble Code: Oxygen Sensor Reference Voltage Circuit Open - Bank 2 Sensor 1

Check Engine Light

P2247 code definition

The P2247 diagnostic trouble code is an indication that there is a problem with the bank 2 sensor 1 oxygen (O2) sensor reference voltage circuit.

Related Trouble Codes:

  • P2243 OBD-II Trouble Code: O2 Sensor Ref Voltage Circ/Open Bank 1 Sensor 1
  • P2244 OBD-II Trouble Code: O2 Sensor Reference Voltage Perf Bank 1 Sensor 1
  • P2245 OBD-II Trouble Code: O2 Sensor Reference Voltage Circ Low Bank 1 Sensor 1
  • P2246 OBD-II Trouble Code: O2 Sensor Reference Voltage Circ High Bank 1 Sensor 1
  • P2248 OBD-II Trouble Code: O2 Sensor Reference Voltage Perf Bank 2 Sensor 1
  • P2249 OBD-II Trouble Code: O2 Sensor Reference Voltage Circ Low Bank 2 Sensor 1
  • P2250 OBD-II Trouble Code: O2 Sensor Reference Voltage Circ High Bank 2 Sensor 1

What the P2247 code means

The bank 2 sensor 1 oxygen (O2) sensor has sent a voltage signal to the powertrain control module (PCM) that does not fall within the predetermined parameters that have been set by the manufacturer. When this happens, the P2247 diagnostic trouble code will be stored by the powertrain control module (PCM) and the Check Engine Light will come on in the dashboard.

What causes the P2247 code?

  • Faulty oxygen (O2) sensor

  • Oxygen (O2) sensor wires that are broken, shorted, frayed, disconnected, or corroded

  • Oxygen (O2) sensor connectors that are disconnected, damaged, or corroded

  • A blown oxygen (O2) sensor fuse

  • Engine vacuum leaks

  • Exhaust leaks

  • Intake manifold leaks

  • Incorrect fuel pressure

  • Faulty powertrain control module (PCM)

What are the symptoms of the P2247 code?

  • Increased fuel consumption
  • Black smoke coming out of tailpipe
  • Lean engine condition
  • Rich engine condition
  • Check Engine Light on

How does a mechanic diagnose the P2247 code?

  • Diagnostic trouble codes should be diagnosed in the order that they appear in the powertrain control module (PCM).

  • Uses an OBD-II scanner to collect all trouble codes that have been stored by the powertrain control module (PCM) as well as freeze frame data.

  • Inspects oxygen (O2) sensor wiring for breaks, shorts, frays, disconnections, and corrosion.

  • Repairs or replaces oxygen (O2) sensor wiring that is damaged.

  • Inspects oxygen sensor (O2) sensor connectors for loose connections, damage, and corrosion.

  • Uses the OBD-II scanner to clear all diagnostic trouble codes and complete a test drive to see if the P2247 code comes back.

  • If the P2247 trouble code does come back, a scanner is used to observe the voltage signal of the upstream oxygen (O2) sensor located in front of the catalytic converter.

  • This voltage reading should show a constant variation between 100 millivolts and 900 millivolts.

  • Observes the voltage signal of the downstream oxygen (O2) sensor, located behind the catalytic converter.

  • This voltage reading should show a slow variation between 100 millivolts and 200 millivolts.

  • If the oxygen (O2) sensor voltage readings coincide with the above specifications, inspects the engine vacuum lines for leaks. Repairs engine vacuum leaks as necessary.

  • Uses the OBD-II scanner to clear all diagnostic trouble codes and complete a test drive to see if the P2247 code comes back.

  • If the P2247 trouble code does come back, inspect exhaust for leaks. Repairs exhaust leaks as necessary.

  • Uses the OBD-II scanner to clear all diagnostic trouble codes and complete a test drive to see if the P2247 code comes back.

  • If the P2247 trouble code does come back, inspects the intake manifold for leaks. Repairs leaks as necessary.

  • The oxygen (O2) sensor may be faulty and need to be replaced if the voltage readings to not coincide with the above specifications.

  • Uses the OBD-II scanner to clear all diagnostic trouble codes and complete a test drive to see if the P2247 code comes back.

  • If the P2247 diagnostic trouble code does come back, there is a possibility that the powertrain control module (PCM) is faulty and needs to be repaired and reprogrammed. This is rare.

Common mistakes when diagnosing the P2247 code

The most common mistake that is made is when lean or rich engine conditions are mistakenly determined to be the cause of the P2247 diagnostic trouble code. It is also common for the wrong oxygen (O2) sensor to be replaced by mistake. It is important to keep in mind that vacuum leaks could be responsible for this error code and are commonly overlooked as a possibility.

How serious is the P2247 code?

A diagnostic trouble code is normally considered serious when it causes drivability issues or a change in performance. While the P2247 diagnostic trouble code is present there may be a decrease in fuel economy, but this code is not known to cause drivability issues. For this reason, the P2247 diagnostic trouble code is not considered a serious one. However, any diagnostic trouble code that has been stored by the powertrain control module (PCM) should be addressed in a timely manner.

What repairs can fix the P2247 code?

  • Replace faulty oxygen (O2) sensor

  • Repair or replace oxygen (O2) sensor wires that are broken, shorted, frayed, disconnected, or corroded

  • Repair or replace oxygen (O2) sensor connectors that are disconnected, damaged, or corroded

  • Replace oxygen (O2) sensor fuse if necessary

  • Locate and repair engine vacuum leaks

  • Locate and repair exhaust leaks

  • Locate and repair intake manifold leaks

  • To repair incorrect fuel pressure: the fuel pump, fuel pressure sensor, or fuel pressure regulator may need to be replaced

  • Replace and reprogram powertrain control module (PCM)

Additional comments for consideration regarding the P2247 code

The oxygen (O2) sensor is the most common cause of the P2247 diagnostic trouble code, and a replacement will fix the problem and successfully clear the trouble code from the powertrain control module (PCM). Keep in mind that if a vacuum leak has caused a lean or rich condition, the P2247 diagnostic trouble code may be stored as well. It is important to complete a thorough inspection of the vacuum lines and the intake manifold for leaks.

Need help with a P2247 code?

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The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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