P2239 OBD-II Trouble Code: O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1

P2239 code definition

O2 Sensor Positive Current Control Circuit High Bank 1 Sensor 1

What the P2239 code means

This trouble code indicates that the powertrain control module has detected a voltage from the O2 sensor positive current control circuit that is higher than the range of acceptance set by the vehicle manufacturer.

What are the causes of the P2239 code?

Some of the potential causes of of this trouble code may include:

• A faulty oxygen sensor may be present
• The connector or wiring associated with the oxygen sensor could be damaged
• The fuel pressure may be out of specification
• There may be a vacuum leak somewhere
• The powertrain control module could be malfunctioning

What are the symptoms of the P2239 code?

Some of the symptoms of this trouble code that the driver may experience would include:

• The engine could experience a lean fuel condition
• The engine could experience a rich fuel condition
• The vehicle may have decreased fuel efficiency
• The Check Engine Light will likely be illuminated

How does a mechanic diagnose the P2239 code?

A mechanic may diagnose this trouble code by first locating and inspecting the oxygen sensor that is upstream and on bank 1. This would also include an inspection of the wiring and connector that are associated with the oxygen sensor for damage. After these two things have been inspected and the issue is still not found, the mechanic would then test fuel pressure and vacuum readings using specialized tools to do so. After these readings have come back within specification and the problem still exists, the mechanic would finally test the powertrain control module for proper function using a high tech scan tool. After all tests have been performed, the mechanic would relay their findings over to the customer to make a repair decision.

Common mistakes when diagnosing the P2239 code

A common mistake that could be made when diagnosing this trouble code would be to replace the oxygen sensor without considering any other possible causes of the issue. Oxygen sensors are often replaced in vein due to the fact that they are mentioned in the trouble code definition.

How serious is the P2239 code?

This trouble code would be considered moderately serious. This is due to the fact that it does not cause any driveability issues but can still affect your vehicle's fuel efficiency. Having this trouble code stored can cost you more money at the gas pump which will make most want to have the issue resolved as soon as possible.

What repairs can fix the P2239 code?

Repairs that can potentially fix issues caused by this trouble code would include:

• Replacing the oxygen sensor that is upstream on bank 1
• Repairing or replacing wiring that is associated with the oxygen sensor
• Resolving a fuel pressure issue
• Repairing a vacuum leak
• Replacing the powertrain control module

Additional comments regarding the P2239 code

Even though this code will not cause major damage to your vehicle right away, lean or rich conditions can eventually cause damage to the catalytic converters. This can be a very costly repair and can be completely avoided if this code is diagnosed and repaired in a timely manner.

Need help with a P2239 code?

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