P207C – Intake Manifold Tuning Valve Position Sensor/Switch Circuit, Bank 2

P207C Possible Causes

• Faulty Intake Manifold Tuning Valve Position Sensor/Switch
• Intake Manifold Tuning Valve Position Sensor/Switch harness is open or shorted
• Intake Manifold Tuning Valve Position Sensor/Switch circuit poor electrical connection
• Faulty Intake Manifold Tuning Valve (IMTV)
• Faulty Intake Manifold Runner Control (IMRC)
• Faulty Powertrain Control Module (PCM)

What Does It Mean?

How to Fix Code P207C

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

P207C Possible Symptoms

Engine Light On (or Service Engine Soon Warning Light)

P207C Meaning

The Intake Manifold Tuning Valve (IMTV) is a motorized actuated unit mounted directly on the intake manifold. The IMTV actuator controls a shutter attached to the actuator shaft. There is no monitor input to the Powertrain Control Module (PCM) with this system to indicate the shutter position.

The motorized IMTV unit will not be powered below approximately 2600 RPM or higher on some vehicles. The shutter will be in the closed position not allowing the air flow mixture to occur in the intake manifold. Above approximately 2600 RPM or higher, the motorized unit will be powered up. The motorized unit will be commanded by the PCM initially at a 100% duty cycle to move the shutter to the open position, then will drop to approximately 50% to continue holding the shutter open.

The IMTV (Intake Manifold Tuning Valve) system is monitored for failure during continuous self-tests, Key ON Engine OFF (KOEO) or Key ON Engine Running (KOER). The test fails when the signal is above or below an expected calibrated range.

P207D Possible Causes

• Faulty intake manifold tuning valve position sensor/switch
• Intake manifold tuning valve position sensor/switch harness is open or shorted
• Poor electrical connection in the intake manifold tuning valve position sensor/switch circuit
• Faulty intake manifold tuning valve (IMTV)
• Faulty intake manifold runner control (IMRC)
• Faulty powertrain control module (PCM)

What Does It Mean?

How to Fix Code P207D

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

P207D Possible Symptoms

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

P207D Meaning

The intake manifold tuning valve (IMTV) is a motorized actuator unit mounted directly on the intake manifold. The IMTV actuator controls a shutter attached to the actuator shaft. There is no monitor input to the powertrain control module (PCM) with this system to indicate the shutter position.

The motorized IMTV unit will not be powered below approximately 2600 RPM or higher on some vehicles. The shutter will be in the closed position, preventing the air flow mixture from occurring in the intake manifold. Above approximately 2600 RPM or higher, the motorized unit will be powered. The motorized unit will be controlled by the PCM initially at a 100% duty cycle to move the shutter to the open position, then will drop to approximately 50% to continue maintaining the shutter open.

The IMTV (Intake Manifold Tuning Valve) system is monitored for failure during continuous self-tests, Key ON Engine OFF (KOEO), or Key ON Engine Running (KOER). The test fails when the signal is above or below an expected calibrated range.

P207E – Intermittent circuit of the intake manifold tuning valve position sensor/switch, bank 2

P207E Possible Causes

• Faulty intake manifold tuning valve position sensor/switch
• Intake manifold tuning valve position sensor/switch harness is open or shorted
• Poor electrical connection in the intake manifold tuning valve position sensor/switch circuit
• Faulty intake manifold tuning valve (IMTV)
• Faulty intake manifold runner control (IMRC)
• Faulty powertrain control module (PCM)

What Does It Mean?

How to Fix Code P207E

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

P207E Possible Symptoms

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

P207E Meaning

The intake manifold tuning valve (IMTV) is a motorized actuated unit mounted directly on the intake manifold. The IMTV actuator controls a shutter attached to the actuator shaft. There is no monitor input to the powertrain control module (PCM) with this system to indicate the shutter position.

The motorized IMTV unit will not be powered below approximately 2600 RPM or higher on some vehicles. The shutter will be in the closed position, not allowing the air flow mixture to occur in the intake manifold. Above approximately 2600 RPM or higher, the motorized unit will be powered. The motorized unit will be controlled by the PCM initially at a 100% duty cycle to move the shutter to the open position, then will drop to about 50% to continue holding the shutter open.

The IMTV (Intake Manifold Tuning Valve) system is monitored for failure during continuous self-tests, Key ON Engine OFF (KOEO), or Key ON Engine Running (KOER). The test fails when the signal is above or below an expected calibrated range.

Meaning of Code P207F:
This code indicates a problem detected by the vehicle’s diagnostic system related to the NOx sensors or their communication in the exhaust gas aftertreatment system (SCR). These sensors measure nitrogen oxides before and after the SCR catalyst to monitor its efficiency and the dosing of the additive (diesel exhaust fluid).

Possible Causes:

1. Failure of NOx sensors/modules:

   • Faulty upstream (before SCR) or downstream (after SCR) sensor.

   • Associated electronic module faulty.
     → Important: Sensor + module form a non-removable assembly. Upstream/downstream assemblies are not interchangeable.

2. Diesel exhaust fluid (AdBlue®/DEF) issue:

   • Degraded, diluted (e.g., with water), or incorrect specification fluid.

   • Crystal deposits in the DEF injector vent tube.

3. SCR catalyst failure.

4. Exhaust system leak (distorting measurements).

5. Electrical/communication problems:

   • Damaged wires, oxidized connectors, bent/broken pins.

   • J1939 communication network failure (linking NOx modules to engine control unit).

Symptoms:

• ⚠️ Check engine light on (or “Service Engine Soon”).

• Possible reduction in engine power (limp mode).

• Possible increase in pollutant emissions.

Diagnostic/Repair Procedure:

1. Initial check:

   • Check the quality and level of DEF fluid. Replace if doubtful.

   • Visually inspect the exhaust system for leaks.

2. Electrical inspection:

   • Carefully examine the wiring harnesses and connectors of the NOx sensors (upstream & downstream).

   • Look for: cut/chafed wires, improperly engaged connectors, oxidized, bent, broken, or backed-out pins.

3. In-depth diagnosis (requires specific tool):

   • Use a diagnostic tool to:

     • Read specific fault codes from the NOx modules (internal failures reported via J1939).

     • Check real-time values of the NOx sensors (upstream vs downstream).

     • Test communication on the J1939 bus.

4. Probable solutions:

   • Replace the faulty NOx sensor + module assembly (upstream or downstream based on diagnosis). Never interchange assemblies or separate sensor/module.

   • Clean or replace the DEF injector if clogged with crystals.

   • Replace the SCR catalyst if ineffective (after ruling out other causes).

   • Repair damaged wires/connectors.

Important:

• This fault often requires professional diagnosis with a dedicated tool.

• NOx modules are “intelligent” and self-diagnosing: the codes they send to the PCM guide the repair.

• The check engine light (MIL) turns off automatically after 2 successful drive cycles following the repair.

Symptoms

The check engine light will illuminate and the computer will have set code P2080. No other symptoms will be easily noticeable.

Potential Causes

Causes

of this DTC may include:

• Check for loose or corroded connectors or terminals, which is often the case
• Broken wires or missing insulation can cause a direct short to ground
• The sensor may have failed
• A catback exhaust system without EGT provisions installed
• It is possible, though unlikely, that the computer has failed

P2080 Repair Procedures

Lift the vehicle and locate the sensor. For this code, it refers to the Bank 1 sensor, which is the engine side containing cylinder #1. It is located between the exhaust manifold and the converter or, in the case of a diesel, before the diesel particulate filter (DPF). It looks different from oxygen sensors in that it is only a two-wire plug. A vehicle with a turbo will have the sensor near the turbo’s exhaust inlet.
Check the connectors for any abnormalities such as corrosion or loose terminals. Follow the pigtail to its connector and check it as well.
Look for signs of missing insulation or exposed wires that could be shorted to ground.

Disconnect the upstream connector and remove the EGT sensor. Check the resistance with an ohmmeter. Probe the two terminals of the connector. A good EGT will have about 150 ohms. If there is very little resistance—below 50 ohms, replace the sensor.

Use a hairdryer or heat gun and heat the sensor while watching the ohmmeter. The resistance should decrease as the sensor heats up and increase as it cools. If not, replace it.
If everything was good at this point, turn on the key and measure the voltage on the engine side of the pigtail. There should be 5 volts at the connector. If not, replace the computer.
Another reason this code may be set is if the catalytic converter has been replaced in favor of a catback system. In most states, this is an illegal procedure subject to heavy fines if caught. It is advisable to check local and national laws regarding the removal of this system as it allows uncontrolled emissions into the atmosphere. It may work, but it is everyone’s responsibility to do our part to keep our atmosphere clean for future generations.

Until this is repaired, the code can be reset by purchasing a 2.2-ohm resistor for pocket change at any electronics store. Simply discard the EGT sensor and plug the resistor into the engine-side electrical connector. Wrap it with tape, and the computer will be convinced that the EGT is functioning properly.

P2081 Exhaust Gas Temperature EGT Sensor Circuit Intermittent, Bank 1 Sensor 1

Symptoms

The check engine light will illuminate and the computer will have set code P2081. No other symptoms will be easily recognizable.

Potential Causes

Causes

of this DTC may include:

• Check for loose or corroded connectors or terminals, which is often the case
• Broken wires or missing insulation can cause a direct short to ground
• The sensor may have failed
• A catback exhaust system without EGT provisions installed
• It is possible, but unlikely, that the computer has failed

P2081 Repair Procedures

• Lift the vehicle and locate the sensor. For this code, it refers to the sensor on bank 1, which is the engine side that contains cylinder #1. It is located between the exhaust manifold and the converter or, in the case of a diesel, before the diesel particulate filter (DPF). It looks different from oxygen sensors in that it is only a two-wire plug. A vehicle with a turbo will have the sensor next to the turbo’s exhaust inlet.
• Check the connectors for any abnormalities such as corrosion or loose terminals. Follow the pigtail to its connector and check it as well.
• Look for signs of missing insulation or bare wires that could be shorted to ground.
• Unplug the upstream connector and remove the EGT sensor. Check the resistance with an ohmmeter. Probe the two terminals of the connector. A good EGT will have about 150 ohms. If there is very little resistance – below 50 ohms, replace the sensor.
• Use a hairdryer or heat gun and heat the sensor while watching the ohmmeter. The resistance should decrease when the sensor is heated and increase when cooling. Otherwise, replace it.
• If everything was good at this point, turn the key on and measure the voltage on the engine side of the pigtail. There should be 5 volts at the connector. Otherwise, replace the computer.

Another reason this code may be set is if the catalytic converter has been replaced in favor of a catback system. In most states, this is an illegal procedure subject to heavy fines if caught. It is advisable to check local and national laws regarding the removal of this system as it allows uncontrolled emissions into the atmosphere. It may work, but it is everyone’s responsibility to do our part to keep our atmosphere clean for future generations.

Until this is repaired, the code can be reset by purchasing a 2.2 ohm resistor for pocket change at any electronics store. Simply discard the EGT sensor and plug the resistor into the engine-side electrical connector. Wrap it with tape and the computer will be convinced that the EGT is functioning correctly.

Symptoms

The check engine light will illuminate and the computer will have set code P2082. No other symptoms will be easily recognizable.

Potential Causes

Causes

of this DTC may include:

• Check for loose or corroded connectors or terminals, which is often the case
• Broken wires or missing insulation can cause a direct short to ground
• The sensor may have failed
• A catback exhaust system without EGT provisions installed
• It is possible, but unlikely, that the computer has failed

P2082 Repair Procedures

• Lift the vehicle and locate the sensor. For this code, it refers to the Bank 1 sensor, which is the engine side containing cylinder #1. It is located between the exhaust manifold and the converter, or in the case of a diesel, before the diesel particulate filter (DPF). It looks different from oxygen sensors in that it is only a two-wire plug. A vehicle with a turbo will have the sensor near the turbo’s exhaust inlet.
• Check the connectors for any abnormalities such as corrosion or loose terminals. Follow the pigtail to its connector and check it as well.
• Look for signs of missing insulation or bare wires that could be shorted to ground.
• Disconnect the upstream connector and remove the EGT sensor. Check the resistance with an ohmmeter. Probe the two terminals of the connector. A good EGT will have about 150 ohms. If there is very little resistance—below 50 ohms, replace the sensor.
• Use a hairdryer or heat gun and heat the sensor while watching the ohmmeter. The resistance should decrease as the sensor is heated and increase as it cools. If not, replace it.

If everything was good at this point, turn on the key and measure the voltage on the engine side of the pigtail. There should be 5 volts at the connector. If not, replace the computer.
Another reason this code may be set is if the catalytic converter has been replaced in favor of a catback system. In most states, this is an illegal procedure subject to heavy fines if caught. It is advisable to check local and national laws regarding the removal of this system as it allows uncontrolled emissions into the atmosphere. It may work, but it is everyone’s responsibility to do our part to keep our atmosphere clean for future generations.

Until this is repaired, the code can be reset by purchasing a 2.2-ohm resistor for pocket change at any electronics store. Simply discard the EGT sensor and plug the resistor into the engine-side electrical connector. Wrap it with tape, and the computer will be convinced that the EGT is functioning correctly.

Symptoms

The check engine light will illuminate and the computer will have set code P2083. No other symptoms will be easily recognizable.

Potential Causes

Causes

of this DTC may include:

• Check for loose or corroded connectors or terminals, which is often the case
• Broken wires or missing insulation can cause a direct short to ground
• The sensor may have failed
• A catback exhaust system without EGT provisions installed
• It is possible, but unlikely, that the computer has failed

P2083 Repair Procedures

• Lift the vehicle and locate the sensor. For this code, it refers to the Bank 1 sensor, which is the engine side containing cylinder #1. It is located between the exhaust manifold and the converter or, in the case of a diesel, before the diesel particulate filter (DPF). It looks different from oxygen sensors in that it is only a two-wire plug. A vehicle with a turbo will have the sensor near the turbo’s exhaust inlet.
• Check the connectors for any abnormalities such as corrosion or loose terminals. Follow the pigtail to its connector and check it as well.
• Look for signs of missing insulation or bare wires that could be shorted to ground.
• Disconnect the upstream connector and remove the EGT sensor. Check the resistance with an ohmmeter. Probe the two terminals of the connector. A good EGT will have about 150 ohms. If there is very little resistance—below 50 ohms, replace the sensor.
• Use a hairdryer or heat gun and heat the sensor while watching the ohmmeter. The resistance should decrease as the sensor heats up and increase as it cools. If not, replace it.
• If everything was good at this point, turn on the key and measure the voltage on the engine side of the pigtail. There should be 5 volts at the connector. If not, replace the computer.
  Another reason this code may be set is if the catalytic converter has been replaced in favor of a catback system. In most states, this is an illegal procedure subject to heavy fines if caught. It is advisable to check local and national laws regarding the removal of this system as it allows uncontrolled emissions into the atmosphere. It may work, but it is everyone’s responsibility to do our part to keep our atmosphere clean for future generations.

Until this is repaired, the code can be reset by purchasing a 2.2-ohm resistor for pocket change at any electronics store. Simply discard the EGT sensor and plug the resistor into the engine-side electrical connector. Wrap it with tape, and the computer will be convinced that the EGT is functioning correctly.

Symptoms

The check engine light will illuminate and the computer will have set code P2084. No other symptoms will be easily noticeable.

Potential Causes

Causes

of this DTC may include:

• Check for loose or corroded connectors or terminals, which is often the case
• Broken wires or missing insulation can cause a direct short to ground
• The sensor may have failed
• A catback exhaust system installed without EGT provisions
• It is possible, but unlikely, that the computer has failed

P2084 Repair Procedures

• Lift the vehicle and locate the sensor. For this code, it refers to the Bank 1 sensor, which is the engine side containing cylinder #1. It is located between the exhaust manifold and the converter, or in the case of a diesel, before the diesel particulate filter (DPF). It looks different from oxygen sensors in that it is only a two-wire plug. A vehicle with a turbo will have the sensor near the turbo’s exhaust inlet.
• Check the connectors for any abnormalities such as corrosion or loose terminals. Follow the pigtail to its connector and check it as well.
• Look for signs of missing insulation or exposed wires that could be shorted to ground.
• Disconnect the upstream connector and remove the EGT sensor. Check the resistance with an ohmmeter. Probe the two terminals of the connector. A good EGT will have about 150 ohms. If there is very little resistance—below 50 ohms, replace the sensor.
• Use a hairdryer or heat gun and heat the sensor while watching the ohmmeter. The resistance should decrease as the sensor heats up and increase as it cools. If not, replace it.
• If everything was good at this point, turn on the key and measure the voltage on the engine side of the pigtail. There should be 5 volts at the connector. If not, replace the computer.
  Another reason this code may be set is if the catalytic converter has been replaced in favor of a catback system. In most states, this is an illegal procedure subject to heavy fines if caught. It is advisable to check local and national laws regarding the removal of this system as it allows uncontrolled emissions into the atmosphere. It may work, but it is everyone’s responsibility to do our part to keep our atmosphere clean for future generations.

Until this is repaired, the code can be reset by purchasing a 2.2 ohm resistor for pocket change at any electronics store. Simply discard the EGT sensor and plug the resistor into the engine-side electrical connector. Wrap it with tape and the computer will be convinced that the EGT is functioning correctly.