Open circuit, short to voltage or chafed wiring between the ECU and the solenoid; Corroded, loose or damaged connector at the solenoid or ECU; Faulty exhaust valve control solenoid (internal short or open winding); Poor power or earth supply to the solenoid circuit, such as a blown fuse or faulty relay where fitted; Oil contamination or leaking oil inside the solenoid connector, damaging the terminals; Faulty ECU driver circuit.

P0080

Exhaust Valve Control Solenoid Circuit High Bank 1.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
0: AreaFuel and air metering, auxiliary emission controls
80: FaultThe specific fault in that area

What it means

P0080 means the engine control unit has detected a high voltage or signal condition in the circuit for the exhaust valve control solenoid on Bank 1. The ECU commands the solenoid on and off and monitors the circuit, and it sets the code when the voltage or current it sees does not match what it expects for that command. The exact system (variable exhaust valve timing or lift, or another exhaust valve control function) varies with the engine, so check the model-specific details.

Symptoms

Engine warning light on
Rough or unstable idle
Loss of power or flat performance at certain revs
Poor fuel economy
Engine running in a reduced-performance (limp) mode on some models
Possible additional valve timing or camshaft related codes stored

Possible causes

Open circuit, short to voltage or chafed wiring between the ECU and the solenoidlikely
Corroded, loose or damaged connector at the solenoid or ECUlikely
Faulty exhaust valve control solenoid (internal short or open winding)likely
Poor power or earth supply to the solenoid circuit, such as a blown fuse or faulty relay where fittedpossible
Oil contamination or leaking oil inside the solenoid connector, damaging the terminalspossible
Faulty ECU driver circuitrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine temperature, load and rpm when the code set
Check for related codes such as camshaft position, oil pressure or valve timing faults, and deal with those in a logical order
Visually inspect the solenoid, its connector and the wiring loom for chafing, heat damage, oil ingress and corrosion
Check the relevant fuse and any relay in the solenoid supply, using the wiring diagram for the specific model and engine
Measure the solenoid winding resistance and compare it with the manufacturer specification
With the connector unplugged, check the supply, earth and control wires for continuity and for shorts to voltage or earth
Command the solenoid with a scan tool actuator test if the vehicle supports it, and watch for a response and for the fault returning
Clear the code and road test to confirm whether it returns, rechecking the circuit if it does

How to fix

Repair or replace damaged wiring and fix any short to voltage or open circuit
Clean, repair or replace the affected connector or terminals, and cure any oil leak feeding into it
Replace the exhaust valve control solenoid if its resistance or operation is out of specification
Replace the blown fuse or faulty relay after finding out why it failed
Check for a manufacturer software update or ECU repair only after the wiring and solenoid have been proven good

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but performance and economy may suffer and the fault can affect engine operation. Get it diagnosed soon, and avoid heavy loads or long journeys if it is running poorly or in limp mode.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.