How Severe Is This DTC?

A stored P20D2 code should be considered severe and addressed as quickly as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20D2 code.

What Are Some of the Symptoms of the Code?

Symptoms of a P20D2 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 injector
• Open or shorted circuits in the EAS fuel injection control circuit
• Insufficient DEF in the EAS tank
• Faulty EAS controller/PCM or programming error

What Are the Troubleshooting Steps for P20D2?

A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle-specific diagnostic information will be needed to diagnose a P20D2 code.

Finding a technical service bulletin (TSB) that matches the vehicle’s year, make, and model, as well as 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 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 is immediately reset, 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. You can also use your vehicle’s information source to locate the exact position of the EAS A fuel injector.

Use the DVOM to test (voltage drop) the EAS control system’s power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power (battery voltage) and ground circuits are found, use the scanner to activate the EAS fuel injector (solenoid) and test the output control circuit voltage. If voltage is insufficient, suspect a faulty controller or a programming error.

If the output voltage circuit is within parameters, use the DVOM to test the EAS fuel injector in question. If the injector does not meet the manufacturer’s specifications, suspect it has failed.

The EAS fuel injector is simply a solenoid injector that sprays reducing fluid into the exhaust.
Do not forget ground circuits during voltage drop testing.

How severe is this DTC?

A stored P20D3 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 P20D3 code.

What are some of the symptoms of the code?

Symptoms of a P20D3 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 injector
2. Open or shorted circuits in the EAS fuel injection control circuit
3. Insufficient DEF in EAS tank
4. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20D3?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20D3 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. You can also use your vehicle information source to locate the exact position of EAS fuel injector A.

Use the DVOM to test (voltage drop) the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power (battery voltage) and ground circuits are found, use the scanner to activate the EAS fuel injector (solenoid) and test the output control circuit voltage. If voltage is insufficient, suspect the controller is faulty or encountered a programming error.

If the output voltage circuit is within parameters, use the DVOM to test the EAS fuel injector in question. If the injector doesn’t meet manufacturer specifications, suspect it has failed.

The EAS fuel injector is simply a solenoid injector that sprays reducing fluid into the exhaust
Don’t forget ground circuits during voltage drop testing

How severe is this DTC?

A stored P20D4 code should be considered severe and addressed as quickly as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20D4 code.

What are some of the symptoms of the code?

Symptoms of a P20D4 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 injector
2. Open or shorted circuits in the EAS fuel injection control circuit
3. Insufficient DEF in the EAS tank
4. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20D4?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20D4 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 useful 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 will need to consult your vehicle information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications. You can also use your vehicle information source to locate the exact position of the EAS fuel injector.

Use the DVOM to test (voltage drop) the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power (battery voltage) and ground circuits are found, use the scanner to activate the EAS fuel injector (solenoid) and test the output control circuit voltage. If voltage is insufficient, suspect the controller is faulty or encountered a programming error.

If the output voltage circuit is within parameters, use the DVOM to test the EAS fuel injector in question. If the injector does not meet manufacturer specifications, suspect it has failed.

The EAS fuel injector is simply a solenoid injector that sprays reducing fluid into the exhaust
Remember ground circuits during voltage drop testing

How severe is this DTC?

A stored P20D5 code should be considered severe and addressed as quickly as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20D5 code.

What are some of the symptoms of the code?

Symptoms of a P20D5 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 injector
• Open or shorted circuits in the EAS fuel injection control circuit
• Insufficient DEF in EAS tank
• Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20D5?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20D5 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. You can also use your vehicle information source to locate the exact position of the EAS fuel injector.

Use the DVOM to test (voltage drop) the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power (battery voltage) and ground circuits are confirmed, use the scanner to activate the EAS fuel injector (solenoid) and test the output control circuit voltage. If voltage is insufficient, suspect the controller is faulty or encountered a programming error.

If the output voltage circuit is within parameters, use the DVOM to test the EAS fuel injector in question. If the injector doesn’t meet manufacturer specifications, suspect it has failed.

The EAS fuel injector is simply a solenoid injector that sprays reducing fluid into the exhaust
Don’t forget ground circuits during voltage drop testing

How severe is this DTC?

A stored P20D6 code should be considered severe and addressed as quickly as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20D6 code.

What are some of the symptoms of the code?

Symptoms of a P20D6 fault code may include:

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

What are some common causes of the code?

Causes

of this code may include:

1. Faulty EAS fuel injector
2. Open or shorted circuits in the EAS fuel injection control circuit
3. Insufficient DEF in the EAS tank
4. Faulty EAS controller/PCM or programming error

What are the troubleshooting steps for P20D6?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be required to diagnose a P20D6 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 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 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 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 information source for diagnostic flowcharts, connector pinout diagrams, connector face views, as well as component testing procedures and specifications. You can also use your vehicle information source to locate the exact location of the EAS A fuel injector.

Use the DVOM to test (voltage drop) the EAS control system power supply. Test fuses with the circuit loaded to avoid misdiagnosis. If proper power (battery voltage) and ground circuits are discovered, use the scanner to activate the EAS fuel injector (solenoid) and test the output control circuit voltage. If voltage is insufficient, suspect the controller is faulty or encountered a programming error.

If the output voltage circuit is within parameters, use the DVOM to test the EAS fuel injector in question. If the injector does not meet manufacturer specifications, suspect it has failed.

The EAS fuel injector is simply a solenoid injector that sp

How serious is this DTC?

A stored P20D7 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 P20D7 code.

What are some of the symptoms of the code?

Symptoms of a P20D7 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 P20D7?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20D7 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 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 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 P20D8 code should be considered severe and addressed as quickly as possible. The EAS system may be damaged due to the conditions that contributed to storing the P20D8 code.

What are some of the symptoms of the code?

Symptoms of a P20D8 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 P20D8?

A diagnostic scanner, digital volt/ohmmeter (DVOM), and vehicle-specific diagnostic information source will be needed to diagnose a P20D8 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 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 either of these components doesn’t meet manufacturer specifications, suspect it has failed.

Don’t forget ground circuits during voltage drop testing

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