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Thread: P0381 Glow Device Circuit Low Voltage

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    Regular Member Teza's Avatar
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    Default P0381 Glow Device Circuit Low Voltage

    Fault P0381 Glow Device Circuit Low Voltage. Would this just be the glow plugs that need replacing ? thanks

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    Just changed the glow plugs on mine and I'm pretty sure I got the same error message. Glow plugs are £8 each

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    Quote Originally Posted by bygumlad View Post
    Just changed the glow plugs on mine and I'm pretty sure I got the same error message. Glow plugs are £8 each
    Do you get the car with the spanner light come on when starting below 5c ?
    Well i did for a while its just getting more & more often now even at 8c.
    Thanks for your reply

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    Had the same symptons on mine, glow plug cured it, careful taking it out though, they are quite long and not that strong.

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    Engine : 3.0D V6

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    P0381 - Glow Plug/Heater Indicator Circuit Malfunction, could be a plug, or could be the controller. Try each plug for resistance before you remove them by removing the wiring linkage and test each one. You will soon identify a duff one.

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    Thanks guys.I will get some new glow plugs fingers crossed it will sort my problem out . Not sure how to test the old plugs first ?

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    I see no point in changing good glow plugs. Not only does it cost you money to replace effectively good parts, but also there is some increased risk of snapping one off and needing more expensive remedial action.


    As the electrical connections have to be disconnected to remove them, there is no more work to do. Simply remove the electrical connectors from each plug and then apply a multi meter across the glow plug connector and the engine block and measure resistance. All 4 glow plugs should show similar values.

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    Quote Originally Posted by Ste View Post
    I see no point in changing good glow plugs. Not only does it cost you money to replace effectively good parts, but also there is some increased risk of snapping one off and needing more expensive remedial action.


    As the electrical connections have to be disconnected to remove them, there is no more work to do. Simply remove the electrical connectors from each plug and then apply a multi meter across the glow plug connector and the engine block and measure resistance. All 4 glow plugs should show similar values.
    Thanks m8

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    Quote Originally Posted by Ste View Post
    I see no point in changing good glow plugs. Not only does it cost you money to replace effectively good parts, but also there is some increased risk of snapping one off and needing more expensive remedial action.


    As the electrical connections have to be disconnected to remove them, there is no more work to do. Simply remove the electrical connectors from each plug and then apply a multi meter across the glow plug connector and the engine block and measure resistance. All 4 glow plugs should show similar values.
    Sorry to sound dim , Do i have the ignition on/off or the engine running ?
    What sort of readings should i be getting ? Thanks

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    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

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    You are only checking the resistance of each glow plug, so it matters not what the engine is doing (best have it switched off due to moving parts / hot etc.

    I can't remember the value you should get (it on this forum somewhere, so use of the search function may be necessary)

    But it will be very evident if one is way off the rest

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