P0077 Intake Valve Control Solenoid Circuit High Bank 1

A solenoid valve on the cylinder head controls oil flow for the variable valve control on the intake side of bank 1. Depending on the manufacturer it drives a camshaft phaser (for example on Nissan engines) or a valve lift changeover (for example on Subaru engines). This code family reports electrical faults in its control circuit; P0077 means the voltage in the control circuit is too high, typically a short to battery voltage. Other manufacturers report the same valve under the "camshaft position actuator" codes instead. Valve control is then switched off or stays in its base position.

Likely causes

Symptoms

• Check engine light on
• Less power, especially at high engine speed with lift changeover
• Rough idle possible
• Follow-up codes for camshaft timing or misfire possible

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, en.wikipedia.org, en.wikipedia.org.