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Old 19-07-19, 12:26 PM   #1
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Default P0656 Where do I start

Hi folks,

When I start my car, I get rough idling for few seconds and its fine..

I ran a scan this morning and found P0656-Fuel Level Output Circuit Malfunction

any pointers on where I start?

I have already bought a fuel filter which I will change at the weekend. On my travels, I read something about PCM and I have no clue.

thanks in advance
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Old 24-07-19, 08:24 AM   #2
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Any pointers folks?
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Old 26-07-19, 07:50 PM   #3
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I had almost the same problem. (P1199) I too changed the filter to no avail. What appears to have worked is a strong dose of Liqui Moly Diesel Purge (3 litres in 1/3 tank and half a tank of Shell vpower.
Then riving the arse off it using all the revs. That's the best bit. Really.
My low rail pressure and it's fault code have disappeared, the car sounds a lot smoother and less rattly especially on idle. In the great scheme of things half a tank of Vpower and 5l of LiquiMoly won't break the bank, worth a punt. Start buying new bits and you'll never stop .
Go cheapest first. Good Luck.
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Old 26-07-19, 07:54 PM   #4
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Scotcruz That's on 2.0HDI, I didn't ask if yours was or was petrol sorry.
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Old 27-07-19, 09:19 AM   #5
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Quote:
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Scotcruz That's on 2.0HDI, I didn't ask if yours was or was petrol sorry.
Thanks mate.. mine is a 2.2 HDI.

Will give it a go and see how it goes.
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Old 13-08-19, 08:02 PM   #6
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I have tried the additive and it hasnt worked.

Any other ideas how to fix the P0656 code?
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Old 13-08-19, 08:44 PM   #7
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What are you scanning the car with if it's not planet or diagbox I would be wary of that code as it relates to a fuel gauge error to the engine ecu. It may be a wrong diagnosis for low additive or similar and nothing to do with fuel pressure etc

What are the symptoms light on all the time limp mode etc

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Old 14-08-19, 03:33 AM   #8
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Quote:
Originally Posted by windy1603 View Post
What are you scanning the car with if it's not planet or diagbox I would be wary of that code as it relates to a fuel gauge error to the engine ecu. It may be a wrong diagnosis for low additive or similar and nothing to do with fuel pressure etc

What are the symptoms light on all the time limp mode etc
I have scanned it using Diagbox, there are no lights or limp mode, just that when I start the car, it rough idles for a few seconds.
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Old 17-08-19, 06:19 PM   #9
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Quote:
Originally Posted by Scotcruz View Post
I have scanned it using Diagbox, there are no lights or limp mode, just that when I start the car, it rough idles for a few seconds.
My car does the same (1st start from cold engine) and I don't think there is anything wrong, though there isn't any codes when scanning the car.
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