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P2077 — Intake Manifold Tuning Imt Valve Position Sensorswitch Circuit Low Bank 1

Manufacturer-specificPowertrain (engine & transmission)

The P2077 code indicates that the engine control module has detected a low voltage condition on the signal from the Intake Manifold Tuning (IMT) valve position sensor switch on bank 1. This sensor is part of the system that monitors the valve’s position during the intake stroke.

Symptoms

What causes it — most likely first

1. Damaged or corroded IMT valve switch

The switch may be worn or have poor contacts, causing a low voltage reading.

2. Wiring or connector damage

Cracked, frayed, or corroded wires/connector pins can introduce resistance or open circuits.

3. Faulty IMT valve actuator

A malfunctioning actuator may not open correctly, leading to a low sensor signal.

4. PCM/ECM misprogramming or fault

Rarely, a software issue or fault in the engine control unit can misread the sensor voltage.

How it's diagnosed

  1. Check the IMT valve switch for continuity and proper voltage at the connector.
  2. Inspect wiring and connectors for damage, corrosion, or loose connections.
  3. Verify the IMT valve actuator’s operation by applying the correct voltage and observing movement.
  4. Reprogram or reset the engine control unit if all hardware checks out.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2070 — Intake Manifold Tuning Imt Valve StuckP2071 — Intake Manifold Tuning Imt Valve StuckP2072 — Throttle Actuator Control System IceP2073 — Manifold Absolute Pressuremass Air FloP2074 — Manifold Absolute Pressuremass Air FloP2075 — Intake Manifold Tuning Imt Valve Posit

Frequently asked

Is the engine computer the usual fix for P2077?

No. The most common fixes involve the IMT valve switch or its wiring. A PCM replacement is rarely needed and should only be considered after all hardware has been verified.

Can a bad sensor cause a low voltage reading?

Yes, a worn or damaged IMT valve position sensor can produce a low voltage signal, triggering P2077.

Will fixing this code improve engine performance?

Correcting the low voltage issue should restore proper valve timing and eliminate misfires, improving idle quality and throttle response.