How severe is this DTC?

A stored P20D9 code should be considered severe and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20D9 code.

What are some of the symptoms of the code?

Symptoms of a P20D9 fault code may include:

• Decreased engine performance
• Excessive black smoke from the vehicle’s exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

Causes of this code may include:

• Faulty EAS fuel supply pump
• Defective EAS fuel pressure sensor
• Open or shorted wiring in the EAS fuel supply control circuit
• Insufficient DEF in the EAS tank
• Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20D9?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20D9 code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I like to start my diagnosis with a visual inspection of EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by plugging the scanner into the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing the codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you’ll need to consult your vehicle’s information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds in the EAS fuel supply system. Continue by testing the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power and ground circuits are detected, use the scanner to activate the EAS fuel pump and test the output control circuit voltage. If voltage is insufficient, test the EAS fuel pump relay. If no input voltage is detected, suspect the controller is faulty or encountered a programming error. If input voltage is present at the relay but output voltage is not detected, suspect the relay is bad.

If the EAS power supply voltage output circuit is within parameters, use the DVOM to test the EAS fuel pressure sensor and fuel pump. If either of these components does not meet manufacturer specifications, suspect it has failed.

Remember ground circuits during voltage drop testing

How severe is this DTC?

A stored P20DA code should be considered serious and addressed as quickly as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20DA code.

What are some of the symptoms of the code?

Symptoms of a P20DA fault code may include:

• Decreased engine performance
• Excessive black smoke from vehicle exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

Causes

of this code may include:

1. Faulty EAS fuel supply pump
2. Defective EAS fuel pressure sensor
3. Open or shorted wiring in EAS fuel supply control circuit
4. Insufficient DEF in EAS tank
5. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20DA?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20DA code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I like to start my diagnosis with a visual inspection of EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by plugging the scanner into the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you’ll need to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds of the EAS fuel supply system. Continue by testing the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power and ground circuits are detected, use the scanner to activate the EAS fuel pump and test the output control circuit voltage. If voltage is insufficient, test the EAS fuel pump relay. If no input voltage is detected, suspect the controller is faulty or encountered a programming error. If input voltage is present at the relay but output voltage is not detected, suspect the relay is bad.

If the EAS power supply output circuit is within parameters, use the DVOM to test the EAS fuel pressure sensor and fuel pump. If any of these components do not meet manufacturer specifications, suspect they have failed.

Don’t forget ground circuits during voltage drop testing

How severe is this DTC?

A stored P20DB code should be considered severe and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20DB code.

What are some of the symptoms of the code?

Symptoms of a P20DB fault code may include:

• Decreased engine performance
• Excessive black smoke from vehicle exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

Causes

of this code may include:

• Faulty EAS fuel supply pump
• Defective EAS fuel pressure sensor
• Open or shorted wiring in EAS fuel supply control circuit
• Insufficient DEF in EAS tank
• Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20DB?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20DB code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I like to start my diagnosis with a visual inspection of EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by connecting the scanner to the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you’ll need to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds in the EAS fuel supply system. Continue by testing the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power and ground circuits are detected, use the scanner to activate the EAS fuel pump and test the output control circuit voltage. If voltage is insufficient, test the EAS fuel pump relay. If no input voltage is detected, suspect the controller is faulty or encountered a programming error. If input voltage is present at the relay but output voltage is not detected, suspect the relay is bad.

If the EAS power supply output circuit is within parameters, use the DVOM to test the EAS fuel pressure sensor and fuel pump. If either of these components does not meet manufacturer specifications, suspect it has failed.

Remember ground circuits during voltage drop testing

How serious is this DTC?

A stored P20DC code should be considered serious and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20DC code.

What are some of the symptoms of the code?

Symptoms of a P20DC fault code may include:

• Decreased engine performance
• Excessive black smoke from vehicle exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

Causes

of this code may include:

1. Faulty EAS fuel supply pump
2. Defective EAS fuel pressure sensor
3. Open or shorted wiring in EAS fuel supply control circuit
4. Insufficient DEF in EAS tank
5. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20DC?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20DC code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I like to start my diagnosis with a visual inspection of EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by plugging the scanner into the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you’ll need to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds of the EAS fuel supply system. Continue by testing the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power and ground circuits are detected, use the scanner to activate the EAS fuel pump and test the output control circuit voltage. If voltage is insufficient, test the EAS fuel pump relay. If no input voltage is detected, suspect the controller is faulty or encountered a programming error. If input voltage is present at the relay but output voltage is not detected, suspect the relay is bad.

If the EAS power supply voltage output circuit is within parameters, use the DVOM to test the EAS fuel pressure sensor and fuel pump. If any of these components do not meet manufacturer specifications, suspect they have failed.

• Don’t forget ground circuits during voltage drop testing

How severe is this DTC?

A stored P20DD code should be considered severe and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20DD code.

What are some of the symptoms of the code?

Symptoms of a P20DD fault code may include:

• Decreased engine performance
• Excessive black smoke from the vehicle’s exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

Causes

of this code may include:

1. Faulty EAS fuel pressure sensor
2. Bad EAS fuel supply pump
3. Open or shorted wiring in the EAS fuel pressure sensor circuit
4. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20DD?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and a source of vehicle-specific diagnostic information will be needed to diagnose a P20DD code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I like to start my diagnosis with a visual inspection of the EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by plugging the scanner into the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing the codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you will need to consult your vehicle’s information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds of the EAS fuel supply system. Continue by testing the power supply to the EAS control system. Test fuses with the circuit loaded to avoid misdiagnosis.

If all system fuses are intact, use the DVOM to test the EAS fuel pressure sensor and sensor circuits. If any of these components do not meet manufacturer specifications, suspect that it has failed.

Don’t forget ground circuits during voltage drop testing

How severe is this DTC?

A stored P20DE code should be considered severe and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20DE code.

What are some symptoms of the code?

Symptoms of a P20DE fault code may include:

• Decreased engine performance
• Excessive black smoke from vehicle exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

The causes

of this code may include:

1. Faulty EAS fuel pressure sensor
2. Defective EAS fuel supply pump
3. Open or shorted wiring in EAS fuel pressure sensor circuit
4. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20DE?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20DE code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I prefer to start my diagnosis with a visual inspection of EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by connecting the scanner to the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you’ll need to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds in the EAS fuel supply system. Continue by testing the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis.

If all system fuses are intact, use the DVOM to test the EAS fuel pressure sensor and sensor circuits. If any of these components don’t meet manufacturer specifications, suspect they have failed.

Don’t forget ground circuits during voltage drop testing

How serious is this DTC?

A stored P20DF code should be considered serious and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20DF code.

What are some symptoms of the code?

Symptoms of a P20DF fault code may include:

• Decreased engine performance
• Excessive black smoke from vehicle exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

Causes of this code may include:

• Faulty EAS fuel pressure sensor
• Defective EAS fuel supply pump
• Open or shorted wiring in EAS fuel pressure sensor circuit
• Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20DF?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20DF code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I prefer to start my diagnosis with a visual inspection of EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by plugging the scanner into the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you’ll need to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds in the EAS fuel supply system. Continue by testing the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis.

If all system fuses are intact, use the DVOM to test the EAS fuel pressure sensor and sensor circuits. If any of these components don’t meet manufacturer specifications, suspect they have failed.

Don’t forget ground circuits during voltage drop testing

How serious is this DTC?

A stored P20E0 code should be considered serious and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20E0 code.

What are some of the symptoms of the code?

Symptoms of a P20E0 fault code may include:

• Decreased engine performance
• Excessive black smoke from vehicle exhaust
• Reduced fuel efficiency
• Other EAS/SCR related codes

What are some common causes of the code?

Causes of this code may include:

1. Faulty EAS fuel pressure sensor
2. Bad EAS fuel supply pump
3. Open or shorted wiring in EAS fuel pressure sensor circuit
4. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20E0?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20E0 code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model; as well as engine size, stored codes, and presented symptoms, could provide helpful diagnostic information.

I like to start my diagnosis with a visual inspection of EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

I would continue by plugging the scanner into the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing codes. Test drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much more difficult to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you’ll need to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds of the EAS fuel supply system. Continue by testing the power supply to the EAS control system. Test fuses with the circuit loaded to avoid misdiagnosis.

If all system fuses are intact, use the DVOM to test the EAS fuel pressure sensor and sensor circuits. If any of these components don’t meet manufacturer specifications, suspect they have failed.

• Don’t forget ground circuits during voltage drop testing

How Serious Is This DTC?

A stored P20E1 code should be considered serious and addressed as soon as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20E1 code.

What Are Some of the Symptoms of the Code?

Symptoms of a P20E1 fault code may include:

• Decreased engine performance
• Excessive black smoke from the vehicle’s exhaust
• Reduced fuel efficiency
• Other EAS/SCR-related codes

What Are Some Common Causes of the Code?

Causes

of this code may include:

1. Faulty EAS fuel pressure sensor
2. Defective EAS fuel supply pump
3. Open or shorted wiring in the EAS fuel pressure sensor circuit
4. Faulty EAS controller/PCM or programming error

What Are the Troubleshooting Steps for P20E1?

A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle-specific diagnostic information will be needed to diagnose a P20E1 code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model, as well as the engine size, stored codes, and symptoms presented, could provide useful diagnostic information.

I like to start my diagnosis with a visual inspection of the EAS wiring harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before proceeding.

I would continue by plugging the scanner into the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Consider noting this information before clearing the codes. Test-drive the vehicle until the PCM enters readiness mode or the code resets.

If the PCM enters readiness mode at this point, the code is intermittent and may be much harder to diagnose. If this is the case, the conditions that contributed to storing the code may need to worsen before an accurate diagnosis can be made.

If the code immediately resets, to complete the next step of your diagnosis, you will need to consult your vehicle’s information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications.

Use the DVOM to test (voltage drop) all grounds of the EAS fuel supply system. Continue by testing the power supply to the EAS control system. Test fuses with the circuit loaded to avoid misdiagnosis.

If all system fuses are intact, use the DVOM to test the EAS fuel pressure sensor and sensor circuits. If any of these components do not meet the manufacturer’s specifications, suspect that it has failed.

Do not forget the ground circuits during voltage drop testing.

P20E2 Possible Causes

• Faulty exhaust gas temperature sensor
• Exhaust gas temperature sensor harness is open or short-circuited
• Poor electrical connection in the exhaust gas temperature sensor circuit
• Exhaust leaks
• Excessive particulate buildup on the sensor

What Does It Mean?

How to Fix Code P20E2

Check the “possible causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P20E2 Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P20E2 Meaning

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out-of-range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it to voltage, sending it back to the PCM with the voltage signal to control engine conditions for effective emission reduction. The PCM sets the OBDII code P20E2 when the exhaust gas temperature sensor is outside factory specifications.