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P codepowertrainMedium severity

P0075Intake Valve Control Solenoid Circuit (Bank 1)

The computer has detected an electrical fault in the Bank 1 intake valve control solenoid circuit.

Definition

The PCM drives the Bank 1 intake valve control solenoid to regulate variable intake valve timing or lift, and it monitors the circuit's voltage and current for plausibility. P0075 sets when a general electrical malfunction — an open, intermittent, or out-of-spec circuit condition — is detected on that circuit. The MIL illuminates and the system typically defaults the intake valve control to a fixed base position, causing reduced power, rough idle, or poor fuel economy until repaired.

Common causes

  • Open or shorted wiring between the PCM and the Bank 1 intake valve control solenoid
  • Corroded, backed-out, or oil-soaked connector terminals at the solenoid
  • Failed solenoid winding (open or resistance out of specification)
  • Chafed harness shorting intermittently to ground or power
  • Blown fuse or lost supply voltage feeding the solenoid circuit
  • Faulty PCM driver (least common)

Common misdiagnoses

  • Replacing the solenoid when the harness or connector is the actual fault
  • Replacing camshaft position sensors that share the area but not the circuit
  • Replacing the PCM without first proving the driver circuit at the connector
  • Treating the code as an oil/mechanical problem when it is strictly electrical

Troubleshooting steps

  1. 1.Inspect the solenoid connector

    Unplug the Bank 1 intake valve control solenoid and look for corrosion, spread terminals, engine oil wicking into the connector, and damaged locks.

  2. 2.Measure solenoid resistance

    Check the winding against the service manual value (typically single-digit to low-teens ohms); an open or near-zero reading condemns the solenoid.

  3. 3.Verify supply and control circuits

    With the key on, confirm supply voltage at the connector and check the PCM control side for continuity and absence of shorts to ground or battery positive.

  4. 4.Wiggle-test the harness

    Flex the harness along its routing while monitoring circuit status or live data to expose intermittent opens from chafing or broken strands.

  5. 5.Command the solenoid

    Use bidirectional controls to activate the solenoid and listen/feel for a click, confirming the complete circuit works end to end.

  6. 6.Clear and confirm

    Clear the DTC, complete a drive cycle with varied RPM, and verify the code does not reset and valve timing PIDs respond normally.

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