P0662–P0665 Intake Manifold Tuning Valve Control Circuit High Bank 1
The voltage on this circuit is sitting near battery voltage. Typically a short to a positive feed, or a disconnected sensor floating high.
Can you drive it? The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P0662 | Intake Manifold Tuning Valve Control Circuit High Bank 1 | Investigate soon |
P0665 | Intake Manifold Tuning Valve Control Circuit High Bank 2 | Investigate soon |
The definition
P0662: Intake Manifold Tuning Valve Control Circuit High Bank 1.
P0662 is a powertrain code (the engine or gearbox), defined by the SAE standard - it means the same thing on any make of car, and any generic OBD-II reader will decode it.
What to check first
Cheapest and fastest checks first:
- Unplug the sensor and check whether the signal falls. If it stays high, suspect the wiring rather than the sensor.
- Check the earth path - a missing earth makes a sensor read high.
What actually causes this on a VAG
This is the twin of P0661 and concerns the same part: the small solenoid valve that switches engine vacuum to the inlet manifold flap actuator. Here the engine control unit sees its own output wire sitting high, at or near battery voltage, when it has commanded the valve on and expects that voltage to be pulled down. Read literally the code means something is holding the wire up - a short to a permanent live. In practice, because this output is switched by pulling it down to earth, an open circuit reads exactly the same way, so a broken wire or a half-seated plug commonly sets it too. Some control units use P0660 for a clean open circuit and reserve P0662 for a genuine short to positive, and some do not draw that distinction at all. Either way, nothing in this code tells you whether the flaps themselves are moving.
Most likely causes, in order
- Connector at the valve not made up, or corroded. A broken locking tab, a plug that was never pushed fully home after other work, a pin pushed back out of the connector body, or green corrosion across the contacts all leave the control unit's wire with nothing to pull it down. This is the cheapest thing on the list, so do it first. Unplug the connector, inspect both pins for corrosion and for one sitting deeper than the other, then refit until it clicks.
- Broken or chafed wire between ECU and valve. The thin wires here break at the point where they flex, often just behind the connector where a previous repair or a cable tie has stressed them. The insulation frequently looks perfect while the copper inside is severed. Gently flex the last few inches of loom while the engine runs and watch whether the fault comes and goes.
- Open winding inside the solenoid valve. The coil can go open circuit internally, which looks identical to a broken wire from the ECU's point of view. Split the two possibilities at the connector rather than by guessing: measure across the valve's own two pins with it unplugged, and separately check continuity back along the loom. The valve is cheap enough that people fit one on spec, but measuring takes two minutes.
- Short to a permanent live. This is what the code literally describes: a wire rubbed through against another loom and held at battery voltage all the time. Look for damage where the loom crosses a bracket or passes close to a heat source, and for signs of previous accident repair or aftermarket wiring near the manifold.
Worth knowing: This is a cheap fault to chase and an expensive one to guess at. The circuit is two wires and one small valve, so a careful look at the connector and the last stretch of loom usually finds it. Bear in mind that unplugging the valve to test it will set this code by itself, so clear the memory and run the engine again before you judge anything by what is stored. Replacing the inlet manifold, the actuator diaphragm or the ECU on the strength of P0662 alone is the classic way to spend a lot of money and still have the code.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does P0662 mean?
P0662 means Intake Manifold Tuning Valve Control Circuit High Bank 1. The voltage on this circuit is sitting near battery voltage. Typically a short to a positive feed, or a disconnected sensor floating high.
Can I drive with P0662?
The engine light will stay on and the car may run in a reduced-power mode. Read the freeze-frame data to see the conditions the fault was logged under.