P2077 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 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 P2077
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.
P2077 Possible Symptoms
Check engine light on (or service engine soon warning light)
P2077 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 shutter position.
The motorized IMTV unit will not be powered below approximately 2600 RPM or higher on some vehicles. The shutter will be in closed position not allowing 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 commanded by the PCM initially at 100% duty cycle to move the shutter to 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.