Intake Manifold Tuning Valve Control Circuit High (Bank 1)
The intake manifold tuning valve control circuit is sending too much voltage to the ECU, like a dimmer switch stuck on high. This prevents the engine from properly adjusting air intake for different driving conditions.
The ECU monitors the voltage signal from the intake manifold tuning valve solenoid control circuit. It expects a voltage range that corresponds to proper solenoid operation. When the voltage exceeds the high threshold, the ECU detects a circuit fault and sets the code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Control Circuit Voltage | 0.5–4.5V (PWM signal) | >4.8V or stuck high |
| Solenoid Resistance | 6–14 ohms | Open circuit or short to power |
Code P0662 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, P0662 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.