P0662
Intake Manifold Tuning Valve Control Circuit High (Bank 1)
- Severity
- Medium
- Driving
- Drivable — book it in
A fault in the intake manifold tuning valve control circuit on bank 1 - a high reading, usually a short to voltage or a lost earth. The module cannot switch the tuning valve, so the intake stays in one configuration and the engine loses part of its power delivery.
Possible causes
- CommonFailed intake manifold tuning valve or its solenoid
- CommonLinkage or flap seized with carbon
- CommonSplit, perished or disconnected vacuum hose
- CommonCorroded connector or damaged wiring
- PossibleBroken flap or linkage inside the manifold
- RareFailed control module driver
What you might notice
- Loss of low-speed torque, or loss of top-end power
- Engine feeling flat in part of its rev range
- Rough idle
- Worse fuel economy
- Check engine light on
What to check, in order
- Check the vacuum hoses first on a vacuum-operated system. A split or disconnected hose is the most common cause and the cheapest to fix.
- Check the flap or linkage moves freely. Carbon seizing the mechanism is very common on a high-mileage engine, particularly a diesel used for short journeys.
- Measure the solenoid winding resistance against specification.
- Inspect the connector for corrosion.
- Be aware that a broken flap inside the manifold can be drawn into the engine on some designs. If the linkage feels loose or disconnected, have it inspected rather than ignored.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Computer output circuits and control module
P0600P0601P0602P0603P0604P0605P0606P0607P0608P0609P0610P0611P0612P0613P0614P0615P0616P0617P0618P0619P0620P0621P0622P0623P0624P0625P0626P0627P0628P0629P0630P0631P0632P0633P0634P0635P0636P0637P0638P0639P0640P0641P0642P0643P0644P0645P0646P0647P0648P0649P0650P0651P0652P0653P0654P0655P0656P0657P0658P0659P0660P0661P0662P0663P0664P0665P0666P0667P0668P0669P0670P0671P0672P0673P0674P0675P0676P0677P0678P0679P0680P0681P0682P0683P0684P0685P0686P0687P0688P0689P0690P0691P0692P0693P0694P0695P0696P0697P0698P0699