P0077 Intake Valve Control Solenoid Circuit High Bank 1

P0077 indicates a high intake valve control solenoid circuit on bank 1. The control path is open, shorted to voltage, or above expected range.

Code details

Generic OBD-II · P0

System: Fuel / Air
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace camshaft sensors until the high solenoid circuit and oil-control connector are verified.

Symptoms of P0077

Check-engine light on, sometimes with rough or uneven running.
Hesitation, surging, or a noticeable change in fuel economy.
Occasionally hard starting or a smell of unburnt fuel.

Common causes of P0077

A failing or contaminated sensor (MAF, MAP, oxygen or air-fuel sensor).
Intake or vacuum leaks, or an exhaust leak near an upstream sensor.
Wiring, connector, or fuel-delivery problems that skew the reading.

Useful checks before replacing parts

Check bank 1 intake solenoid signal voltage, feed, ground, open circuits, short-to-voltage faults, connector fit, and resistance.
Inspect wiring near the cylinder head, oil-soaked connectors, terminal tension, recent timing work, and shared VVT power feeds.
Compare high circuit events with commanded cam timing, actual angle response, and related cam correlation or VVT codes.

Related OBD-II codes

These nearby fuel / air entries can help compare wording and pin down the fault area.