Error code

OBD2 P0079

OBD2P0079
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Exhaust Valve Control Solenoid Circuit Low.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0079 indicates an issue with the exhaust valve control solenoid circuit being low in voltage on bank 1 of the engine.

Symptoms

  • Check Engine Light (CEL) illuminated
  • Rough idle
  • Poor performance
  • Poor fuel economy

Common Causes

  • Wiring harness and connector damage due to poor repair practices or rodent damage
  • Open circuit in the solenoid coil

Diagnosis

  1. Check that the VVT solenoid valve connector is good and free of damage
  2. Inspect wire harness for chafing or exposed/broken wires
  3. Backprobe the VVT solenoid valve to check for battery voltage
  4. Disconnect connectors and test for short circuits or open circuits
  5. Check resistance across the solenoid valve pins

Fixes

  • Repair damaged wiring harness or connector
  • Replace faulty VVT solenoid valve

FAQ

What does P0079 mean?

P0079 indicates a low voltage issue with the exhaust valve control solenoid circuit on bank 1.

How do I diagnose P0079?

Use a multimeter to check for proper voltage and resistance in the VVT solenoid circuit, including connectors and wiring harness.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

More OBD2 codes

All OBD2 codes →Search more codes →