P2077 moderate

Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low (Bank 1)

The P2077 code means the vehicle's onboard diagnostic system has detected: Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low (Bank 1). This is a moderate severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $75 - $500+ (parts and labor; an integrated IMT valve / intake manifold runner control assembly is far costlier than a wiring or connector repair)

Common Misconceptions / Fact Check

Commonly claimedMany databases label P2077 an 'Intake Manifold Air Temperature Sensor' circuit code.

VerifiedThat is the wrong system. P2077 is the Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low (Bank 1) -- a runner-control valve fault, not an air-temperature sensor.

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Common Symptoms

Check Engine Light on
Possible loss of low-end torque or high-rpm power
Engine may feel less responsive under load
Often no noticeable drivability change
Rough running in some cases if the tuning valve cannot change position

Probable Causes (Ranked by Likelihood)

Short to ground in the IMT valve position sensor signal circuit Very High
Failed IMT valve position sensor High
Damaged or corroded connector / loose pins at the IMT valve Moderate
PCM fault (rare) Low

Step-by-Step Diagnostic Procedure

Scan for related IMT valve codes (P2070, P2071, P2075, P2078, P2079) and record freeze-frame data
Inspect the IMT valve connector and wiring for damage, corrosion, or a short to ground
Back-probe the IMT valve position sensor signal circuit and compare voltage to the manufacturer spec
Replace the IMT valve / position sensor if wiring and connector test good but the signal stays out of range

Frequently Asked Questions

What does P2077 mean?

P2077 indicates: Intake Manifold Tuning (IMT) Valve Position Sensor/Switch Circuit Low (Bank 1). The ECM has detected a low-voltage signal from the IMT valve position sensor or its circuit.

Is P2077 serious?

It is usually not an emergency. The car often drives normally, but the intake manifold tuning valve may not switch runner geometry correctly, costing some low-end torque or top-end power. Repair it to restore performance and clear the light.

Can I diagnose this myself?

Basic diagnosis is possible with a scan tool and multimeter. Inspect the IMT valve connector and wiring for a short to ground, back-probe the position-sensor signal, and compare it to the manufacturer specification before replacing the valve.