Intake Valve Control Circuit High (Bank 2)
The engine computer detected that the intake valve timing control circuit on the right side of the engine is stuck in a high voltage state, like a light switch that won't turn off. This prevents proper valve timing adjustment, disrupting the engine's breathing and efficiency.
The ECM monitors the voltage signal from the intake valve control solenoid circuit on Bank 2. When voltage remains above the normal operating threshold for extended periods, it indicates a stuck solenoid, wiring short, or control module issue. The ECM expects the signal to toggle between high and low states during normal variable valve timing operation.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| VVT Solenoid Voltage (Bank 2) | Switches between 0-5V during operation | Remains above 4.5V continuously |
| Control Circuit Resistance | 5-15 ohms | Below 2 ohms or open circuit |
Code P0077 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0077 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.