C4gp high pitch tone from engine bay

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bigbill00
Posts: 35
Joined: 28 Feb 2018, 20:05
Location: Liverpool
My Cars: C4 grand picasso

C4gp high pitch tone from engine bay

Post by bigbill00 »

After turning the engine off I get a high pitch tone from somewhere in the engine bay lasts about 20 to 30 seconds any ideas what this could be
Cheers
MikeT
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Re: C4gp high pitch tone from engine bay

Post by MikeT »

I get the same (C5) and it's just some electronics part (presumably like a stepper motor) going through it's motions.
bigbill00
Posts: 35
Joined: 28 Feb 2018, 20:05
Location: Liverpool
My Cars: C4 grand picasso

Re: C4gp high pitch tone from engine bay

Post by bigbill00 »

Cheers hadn't heard it before and after having to change the starter as it was knackered was hoping it had nothing to do with that
Feel a bit better now to sort and fault lol
RichardW
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Re: C4gp high pitch tone from engine bay

Post by RichardW »

It's the EGR valve - the ECU cycles it from open to closed to check that it responds correctly over the full range.
Richard W
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