What does code P0079 mean?

Q: What does code P0079 mean?

Exhaust Valve Control Solenoid Circuit Low (Bank 1). P0079 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the electrical circuit for the exhaust valve control solenoid on bank 1. This solenoid is used by the variable valve timing system to alter exhaust camshaft timing for improved efficiency and emissions, and the PCM expects to see a specific voltage range when the circuit is active. A low reading means the circuit is likely shorted to ground, has excessive resistance, or the solenoid itself has failed.

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0079

P0079Exhaust Valve Control Solenoid Circuit Low (Bank 1)

P0079 indicates that the powertrain control module (PCM) has detected a low-voltage condition on the electrical circuit for the exhaust valve control solenoid on bank 1. This solenoid is used by the variable valve timing system to alter exhaust camshaft timing for improved efficiency and emissions, and the PCM expects to see a specific voltage range when the circuit is active. A low reading means the circuit is likely shorted to ground, has excessive resistance, or the solenoid itself has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.