Error code
OBD2 P0077
OBD2P0077
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Intake Valve Control Solenoid Circuit High.
Severity
moderateCan drive, but performance issues may occur.
Summary
P0077 indicates an issue with the intake valve control solenoid circuit being high on bank 1 of the engine.
Symptoms
- Check Engine Light (CEL) illuminated
- Rough idle
- Poor performance
- Poor fuel economy
Common Causes
- Wiring short to positive in the intake valve control solenoid circuit
- Damaged wire harness or connector between ECM and VVT solenoid valve
- Open circuit in the solenoid coil of the VVT solenoid valve
Diagnosis
- Check connector and harness for damage
- Test voltage at the VVT solenoid valve while engine is running
- Inspect resistance across the solenoid valve pins
Fixes
- Repair or replace damaged wiring and connectors
- Replace faulty VVT solenoid valve
FAQ
What does P0077 mean?
P0077 indicates a high voltage issue in the intake valve control solenoid circuit on bank 1 of the engine.
How do I diagnose P0077?
Use a multimeter to check for proper voltage and resistance at the VVT solenoid valve, inspect wiring harnesses, and connectors for damage.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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