P0077Intake Valve Control Solenoid Circuit High Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyControl wire shorted to battery voltage
- PossibleSolenoid coil faulty
- PossibleWater or corrosion in the connector
- RareOutput driver in the engine control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.