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P codepowertrainMedium severity

P0076Intake Valve Control Solenoid Circuit Low (Bank 1)

The Bank 1 intake valve control solenoid circuit is reading a lower voltage than expected, usually meaning a short to ground or an open circuit.

Definition

The PCM monitors feedback voltage on the Bank 1 intake valve control solenoid circuit and sets P0076 when the signal stays below the expected threshold — typically caused by a short to ground, an open circuit, or a failed solenoid winding. With the fault present, the PCM disables variable intake valve control on Bank 1 and holds the system at its default position, illuminating the MIL and often causing reduced performance and fuel economy.

Common causes

  • Control or supply wire shorted to ground in the Bank 1 intake solenoid circuit
  • Open circuit from broken wiring or a corroded connector
  • Shorted or open solenoid winding
  • Water intrusion corroding connector terminals to ground
  • Chafed harness against the engine or bracket grounding intermittently
  • Faulty PCM low-side driver stuck on or damaged

Common misdiagnoses

  • Replacing the solenoid when the harness is shorted to ground
  • Replacing the PCM before checking the wiring for a grounded circuit
  • Changing engine oil expecting to fix a purely electrical low-circuit fault
  • Replacing a cam sensor that shares the connector area but not the circuit

Troubleshooting steps

  1. 1.Measure solenoid winding resistance

    Compare against spec; a reading near zero ohms indicates a shorted winding, while infinite resistance indicates an open coil.

  2. 2.Check for shorts to ground

    With the connector unplugged and key off, verify infinite resistance between each solenoid circuit wire and chassis ground; any continuity indicates a grounded harness.

  3. 3.Verify supply voltage

    Key on, confirm battery voltage on the feed side of the connector; a missing feed points to a blown fuse or open upstream wiring.

  4. 4.Inspect harness routing

    Trace the harness for chafe points at brackets, the valve cover edge, and clip locations where insulation commonly wears through to ground.

  5. 5.Test PCM control circuit

    With a test light or scope on the control wire, command the solenoid and confirm proper switching; a circuit that never pulls up/down implicates the driver or wiring.

  6. 6.Repair and revalidate

    Repair the identified open/short, clear the code, and confirm normal commanded-versus-actual valve control operation on a road test.

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