P20F7 – Reductant Injection Valve Stuck Open, Row 2, Unit 1

How severe is this DTC?

A stored P20F7 code should be considered severe and addressed as quickly as possible. The SCR system may be disabled because of this. Catalyst damage could occur if the conditions that contributed to the code being stored are not corrected in a timely manner.

What are some of the symptoms of the code?

Symptoms of a P20F7 trouble code may include:

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

What are some common causes of the code?

Causes

of this code may include:

Faulty reductant injector valve
Open or shorted circuits in the reductant injector valve control
Insufficient DEF in the tank
Faulty SCR controller/PCM or programming error

What are the troubleshooting steps for P20F7?

You will need access to a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of vehicle-specific diagnostic information to diagnose a P20F7 code.

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

You’ll want to start your diagnosis with a visual inspection of the reductant heater system harnesses and connectors. Burned or damaged wiring and/or connectors should be repaired or replaced before continuing.

Proceed by hooking up the scanner to the vehicle’s diagnostic connector and retrieving all stored codes and relevant freeze frame data. Note this information before clearing the codes and test drive the vehicle until the PCM enters readiness mode or the code resets.

The code is intermittent and may be much harder to diagnose (for the time being) if the PCM enters readiness mode. If this is the case, the conditions that contributed to the code being stored may need to worsen before an accurate diagnosis can be made.

If the code resets, consult your vehicle information source for diagnostic flowcharts, connector pinout charts, connector face views, as well as component testing procedures and specifications. This information will be needed to complete the next step of your diagnosis.

Use the DVOM to test the SCR control system’s 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 reductant injector valve (solenoid) and test the output control circuit voltage. If voltage is insufficient, suspect the controller is faulty or has encountered a programming error.

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

The reductant injector valve is actually a solenoid injector that sprays reductant fluid into the exhaust

P0C00 – Drive Motor ‘A’ Current Low

P0C00 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C00

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.

P0C00 Possible Symptoms

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

P0C00 Meaning

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in MG2. The system controls the rotation of the magnetic field based on the rotation position and speed of the rotor. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls MG2 speed by regulating the frequency of the alternating current. Additionally, the system properly controls the rotating magnetic field and the angle of the rotor magnets to generate high torque efficiently, even at high speeds.

P0C01 – Drive Motor ‘A’ Current High

P0C01 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C01

P0C01 Possible Symptoms

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

P0C01 Meaning

P0C03 – Drive Motor “B” Current Low

P0C03 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in the hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C03

P0C03 Possible Symptoms

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

P0C03 Meaning

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in MG2. The system controls the rotation of the magnetic field based on the rotor’s rotation position and speed. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls MG2 speed by regulating the frequency of the alternating current. Additionally, the system properly controls the rotating magnetic field and the angle of the rotor magnets to generate high torque efficiently, even at high speeds.

P0C04 – High Drive Motor “B” Current

P0C04 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C04

P0C04 Possible Symptoms

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

P0C04 Meaning

P0C05 – Drive Motor Phase ‘A’ U-V-W Circuit / Open

P0C05 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C05

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

P0C05 Possible Symptoms

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

P0C05 Meaning

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in MG2. The system controls the rotation of the magnetic field based on the rotor’s rotation position and speed. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls MG2 speed by regulating the frequency of the alternating current. Additionally, the system properly controls the rotating magnetic field and the angle of the rotor magnets to generate high torque efficiently, even at high speeds.

P0C06 – Drive Motor ‘A’ Phase U-V-W Circuit Low

P0C06 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C06

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.

P0C06 Possible Symptoms

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

P0C06 Meaning

P0C07 – Phase A U-V-W Circuit of High Drive Motor

P0C07 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C07

P0C07 Possible Symptoms

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

P0C07 Meaning

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in MG2. The system controls the rotation of the magnetic field based on the rotor’s rotation position and speed. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls MG2 speed by regulating the frequency of the alternating current. Additionally, the system properly controls the rotating magnetic field and the angle of the rotor magnets to generate high torque efficiently, even at high speeds.

P0C08 – Drive Motor Phase ‘B’ U-V-W Circuit / Open

P0C08 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in the hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C08

P0C08 Possible Symptoms

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

P0C08 Meaning

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in MG2. The system controls the rotation of the magnetic field based on the rotor’s rotation position and speed. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls MG2 speed by regulating the frequency of the alternating current. Additionally, the system properly controls the rotating magnetic field and the angle of the rotor magnets to generate high torque efficiently, even at high speeds.

P0C09 – Phase ‘B’ U-V-W Circuit of Low Drive Motor

P0C09 Possible Causes

Faulty hybrid vehicle motor assembly
Hybrid vehicle motor assembly wiring harness is open or short-circuited
Poor electrical connection in hybrid vehicle motor assembly circuit

What Does It Mean?

How to Fix Code P0C09

P0C09 Possible Symptoms

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

P0C09 Meaning

When three-phase alternating current flows through the three-phase windings of the stator coil, a rotating magnetic field is generated in MG2. The system controls the rotation of the magnetic field based on the rotor’s rotation position and speed. As a result, the permanent magnets provided in the rotor are pulled in the direction of rotation, generating torque. The generated torque is almost proportional to the amount of current. The system controls MG2 speed by regulating the frequency of the alternating current. Additionally, the system properly controls the rotating magnetic field and the angle of the rotor magnets to generate high torque efficiently, even at high speeds.