P0028 Intake Valve Control Solenoid Circuit Range/Performance Bank 2

P0028 points to intake valve control solenoid range/performance on bank 2. The solenoid or valve control response is outside expected limits.

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 the actuator before verifying oil condition, solenoid control, and command-to-response behavior.

Symptoms of P0028

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 P0028

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

Compare intake valve control command, actual cam or valve-control feedback, oil pressure, oil temperature, RPM, and load data.
Inspect solenoid connector condition, oil contamination, solenoid screens, actuator movement, wiring voltage drop, and related VVT codes.
Check whether the fault appears hot, cold, after oil service, or during specific cam advance and retard commands.

Related OBD-II codes

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