P2239 O2 Sensor Positive Current Control Circuit, Bank 1, Sensor 1

How severe is this DTC?

An HO2S with a control circuit issue could lead to very poor engine performance and various driving problems. A P2239 code should be classified as severe and fixed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2239 trouble code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors
PCM programming error or faulty PCM

What are the troubleshooting steps for P2239?

A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to accurately diagnose a P2239 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then clear the codes and test the vehicle. One of two things will happen at this point. Either the P2239 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused the P2239 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring schematics, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of the wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

Disconnect the HO2S in question and use the DVOM to check the resistance between the positive current control circuit and the ground circuits. If there is continuity, suspect a faulty HO2S.

If the P2239 code continues to reset, start the engine. Let it reach its normal operating temperature and idle (with the transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe the oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data, and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to the pre-cat sensors). HO2S that are not functioning correctly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to obtain live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will require replacing the HO2S.

In most cases, you will fix this type of code by replacing the HO2S in question but still perform your diagnosis.

P2240 – O2 Sensor Positive Current Control Circuit / Open Sensor 1 Row 2

How severe is this DTC?

An HO2S with a control circuit issue could lead to very poor engine performance and various driving problems. A P2240 code should be classified as severe and fixed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2240 fault code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illumination

What are some common causes of the code?

Causes of this code may include:

Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors
PCM programming error or faulty PCM

What are the troubleshooting steps for P2240?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to accurately diagnose a P2240 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2240 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused the P2240 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Connector face views, connector pinout diagrams, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the specific code and vehicle) can be found using your vehicle information source.

Perform a visual inspection of the wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

Disconnect the HO2S in question and use the DVOM to check resistance between the positive current control circuit and ground circuits. If there is continuity, suspect a faulty HO2S.

If the P2240 code continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. Post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that are not functioning properly should be considered faulty if the engine is in good operating condition.

In most cases, you will fix this type of code by replacing the HO2S in question but still complete your diagnosis.

P2241 O2 Sensor Positive Current Control Circuit Low, Bank 2 Sensor 1

How severe is this DTC?

An HO2S with a control circuit issue could lead to very poor engine performance and various driving problems. A P2241 code should be classified as severe and fixed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2241 fault code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illumination

What are some common causes of the code?

Causes of this code may include:

Faulty oxygen sensor(s)
Burned, chafed, broken, or disconnected wiring and/or connectors
PCM programming error or faulty PCM

What are the troubleshooting steps for P2241?

A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to accurately diagnose a P2241 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then, clear the codes and test-drive the vehicle. One of two things will happen at this point. Either the P2241 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused the P2241 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue with your diagnosis.

Perform a visual inspection of the wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

Disconnect the HO2S in question and use the DVOM to check for continuity between the positive current control circuit and ground circuits. If there is continuity, suspect a faulty HO2S.

If the P2241 code continues to reset, start the engine. Let it reach its normal operating temperature and idle (with the transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe the oxygen sensor input data on the data stream. Narrow the scope of the data stream to include only relevant data, and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively steady (compared to the pre-cat sensors). HO2S that are not operating correctly should be considered faulty if the engine is in good running condition.

In most cases, you will fix this type of code by replacing the HO2S in question but still perform your diagnosis.

P2242 O2 Sensor Positive Current Control Circuit High, Bank 2 Sensor 1

How severe is this DTC?

An HO2S with a control circuit issue could lead to very poor engine performance and various driving problems. A P2242 code should be classified as severe and fixed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2242 trouble code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors
PCM programming error or faulty PCM

What are the troubleshooting steps for P2242?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and a reliable vehicle information source will be needed to accurately diagnose a P2242 code.

Connect the scanner to the vehicle’s diagnostic port and retrieve all stored codes and relevant freeze frame data. You’ll want to note this information in case the code proves to be intermittent. Then clear the codes and test drive the vehicle. One of two things will happen at this point. Either the P2242 code will reset, or the PCM will enter readiness mode.

If the code is intermittent and the PCM enters readiness mode, it may prove more difficult to diagnose. The conditions that caused the P2242 to be stored may need to worsen before an accurate diagnosis can be made. If the code resets, continue your diagnosis.

Perform a visual inspection of the wiring and connectors related to the HO2S. Replace any wiring that has been cut, burned, or damaged.

Disconnect the HO2S in question and use the DVOM to check the resistance between the positive current control circuit and ground circuits. If there is continuity, suspect a faulty HO2S.

If the P2242 code continues to reset, start the engine. Let it reach normal operating temperature and idle (with transmission in neutral or park). Connect the scanner to the vehicle’s diagnostic port and observe the oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data and you’ll get a faster response.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable (compared to pre-cat sensors). HO2S that are not functioning properly should be considered faulty if the engine is in good operating condition.

If the HO2S displays battery voltage or no voltage on the scanner data stream, use the DVOM to get live data from the HO2S connector. If the output data remains the same, suspect an internal HO2S short circuit that will require HO2S replacement.

In most cases, you will fix this type of code by replacing the HO2S in question but still complete your diagnosis.

P2243 O2 Sensor Reference Voltage Circuit / Bank 1 Sensor 1 Open

How severe is this DTC?

An open O2 sensor reference voltage circuit can lead to decreased fuel efficiency and reduced engine performance. A P2243 code should be classified as severe and rectified as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2243 trouble code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illuminated

What are some common causes of the code?

Causes

of this code may include:

Blown O2 sensor fuse
Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors

What are the troubleshooting steps for P2243?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P2243 code.

You can save time by searching for Technical Service Bulletins (TSBs) that match the recorded code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P2243 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and the vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

Use the DVOM to test the O2 sensor voltage at the appropriate connector pin (near the sensor). If no voltage is detected, check the system fuses. Replace blown or faulty fuses as needed.

If voltage is detected, test the corresponding circuit at the PCM connector. If no voltage is detected there, suspect an open circuit between the sensor in question and the PCM. If voltage is found there, suspect PCM programming error or a faulty PCM.

To test the O2 sensors: Start the engine and let it reach its normal operating temperature. Let the engine idle (with the transmission in neutral or park). With the scanner connected to the vehicle’s diagnostic port, observe the oxygen sensor input data on the data stream. Limit the scope of the data stream to include only relevant data, and you will get a faster response.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

A blown O2 sensor fuse is not the cause of a recorded P2243 code, but a reaction to some type of short circuit in the circuit.

P2244 O2 Sensor Reference Voltage Performance, Bank 1 Sensor 1

How severe is this DTC?

An irregular voltage in the O2 sensor reference voltage circuit can lead to reduced fuel efficiency and decreased engine performance. A P2244 code should be classified as severe and addressed as quickly as possible.

What are some of the symptoms of the code?

Symptoms of a P2244 trouble code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illuminated

What are some common causes of the code?

Causes of this code may include:

Blown O2 sensor fuse
Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors

What are the P2244 troubleshooting steps?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P2244 code.

You can save time by searching for Technical Service Bulletins (TSBs) that match the recorded code, vehicle (year, make, model, and engine), and presented symptoms. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P2244 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

Use the DVOM to test the O2 sensor voltage at the appropriate connector pin (near the sensor). If no voltage is detected, check the system fuses. Replace blown or faulty fuses as needed.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

A blown O2 sensor fuse is not the cause of a stored P2244 code, but a reaction to some type of short circuit in the circuit.

P2245 Low Voltage Reference Circuit for O2 Sensor, Bank 1 Sensor 1

How severe is this DTC?

Insufficient voltage in the O2 sensor reference voltage circuit can lead to reduced energy efficiency and decreased engine performance. A P2245 code should be classified as severe and rectified as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2245 fault code may include:

Reduced energy efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illuminated

What are some common causes of the code?

Causes

of this code may include:

Blown O2 sensor fuse
Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors

What are the P2245 troubleshooting steps?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P2245 code.

You can save time by searching for technical service bulletins (TSBs) that match the recorded code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P2245 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout diagrams, component location charts, wiring diagrams, and diagnostic flowcharts (related to the code and the vehicle in question) using your vehicle information source.

Perform a visual inspection of the wiring and associated connectors. Repair or replace wiring that has been cut, burned, or damaged.

Use the DVOM to test the O2 sensor voltage at the appropriate connector pin (near the sensor). If no voltage is detected, check the system fuses. Replace blown or faulty fuses as needed.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

A blown O2 sensor fuse is not the cause of a stored P2245 code, but a reaction to some type of short circuit in the circuit.

P2246 O2 Sensor Reference Voltage Circuit, Bank 1, Sensor 1

How severe is this DTC?

Excessive voltage in the O2 sensor reference voltage circuit can lead to reduced fuel efficiency and decreased engine performance. A P2246 code should be classified as severe and addressed as quickly as possible.

What are some symptoms of the code?

Symptoms of a P2246 fault code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

Blown O2 sensor fuse
Faulty oxygen sensor(s)
Burned, chafed, broken, or disconnected wiring and/or connectors

What are the troubleshooting steps for P2246?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P2246 code.

You can save time by searching for technical service bulletins (TSBs) that match the recorded code, vehicle (year, make, model, and engine), and presented symptoms. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P2246 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

Use the DVOM to test the O2 sensor voltage at the appropriate connector pin (near the sensor). If no voltage is detected, check the system fuses. Replace blown or faulty fuses as needed.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

A blown O2 sensor fuse is not the cause of a stored P2246 code, but a reaction to some type of short circuit in the circuit.

P2247 O2 Sensor Reference Voltage Circuit / Bank 2 Sensor 1 Open

How severe is this DTC?

An open O2 sensor reference voltage circuit can lead to decreased fuel efficiency and reduced engine performance. A P2247 code should be classified as severe and rectified as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P2247 fault code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illumination

What are some common causes of the code?

Causes

of this code may include:

Blown O2 sensor fuse
Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors

What are the troubleshooting steps for P2247?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P2247 code.

You can save time by searching for Technical Service Bulletins (TSBs) that match the recorded code, the vehicle (year, make, model, and engine), and the presented symptoms. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P2247 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout diagrams, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and the vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

Use the DVOM to test the O2 sensor voltage at the appropriate connector pin (near the sensor). If no voltage is detected, check the system fuses. Replace blown or faulty fuses as needed.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable) compared to the pre-cat sensors). Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

A blown O2 sensor fuse is not the cause of a recorded P2247 code, but a reaction to some type of short circuit in the circuit

P2248 O2 Sensor Reference Voltage Performance, Bank 2 Sensor 1

How severe is this DTC?

An irregular voltage in the O2 sensor reference voltage circuit can lead to decreased fuel efficiency and reduced engine performance. A P2248 code should be classified as severe and addressed as quickly as possible.

What are some of the symptoms of the code?

Symptoms of a P2248 trouble code may include:

Reduced fuel efficiency
Decreased engine performance
Stored misfire codes or lean/rich exhaust codes
Service engine soon light illuminated

What are some common causes of the code?

Causes

of this code may include:

Blown O2 sensor fuse
Faulty oxygen sensor(s)
Burned, rubbed, broken, or disconnected wiring and/or connectors

What are the troubleshooting steps for P2248?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P2248 code.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P2248 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the O2 sensor voltage at the appropriate connector pin (near the sensor). If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed.

If the oxygen sensors are functioning normally, the voltage on the pre-cat oxygen sensors will continuously cycle between 1 and 900 millivolts once the PCM enters closed-loop operation. The post-cat sensors will also cycle between 1 and 900 millivolts, but they will stabilize at a certain point and remain relatively stable compared to the pre-cat sensors. Oxygen sensors that are not functioning properly should be considered faulty if the engine is in good operating condition.

A blown O2 sensor fuse is not the cause of a stored P2248 code but a reaction to some type of short circuit in the circuit.