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P codepowertrainMedium severity

P0080Exhaust Valve Control Solenoid Circuit High (Bank 1)

The Bank 1 exhaust valve control solenoid circuit is reading higher voltage than expected, usually from a short to battery power.

Definition

P0080 sets when the PCM detects voltage above the calibrated threshold on the Bank 1 exhaust valve control solenoid circuit, most commonly a short to battery voltage or a failed driver stuck on. The MIL illuminates and exhaust valve control is defaulted; if the short holds the solenoid energized, exhaust cam timing or lift can be locked in an incorrect position, causing rough running, reduced power, or hard starting.

Common causes

  • Control wire chafed and shorted to a battery or ignition feed
  • Moisture or corrosion bridging voltage across connector terminals
  • Solenoid failed with an internal short to power
  • Harness damage from rodents, heat, or collision repair
  • PCM driver transistor failed shorted
  • Improperly installed aftermarket wiring feeding the circuit

Common misdiagnoses

  • Replacing the solenoid when the harness carries the short to power
  • Replacing the PCM without isolating whether the short is internal or external
  • Chasing mechanical cam timing faults for what is an electrical high-voltage code
  • Replacing cam position sensors unrelated to the circuit

Troubleshooting steps

  1. 1.Check for voltage with solenoid commanded off

    Unplug the solenoid, key on, and measure the control wire; battery voltage present when the PCM commands off indicates a short to power or bad driver.

  2. 2.Isolate PCM versus harness

    Disconnect the PCM (key off) and remeasure — voltage that disappears implicates the PCM, voltage that remains implicates the harness.

  3. 3.Trace the harness

    Inspect the bundle where the solenoid wire runs alongside powered circuits for melted or rubbed insulation.

  4. 4.Test the solenoid internally

    Measure resistance between the coil terminals and check for unexpected continuity paths indicating an internal short.

  5. 5.Confirm repair

    After fixing the short, clear the code and sweep the solenoid with bidirectional controls while verifying exhaust cam position follows commands.

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