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Error codes P0340 / U0401 - Camshaft position sensor circuit malfunction / Error in communication with engine control unit (ECU)


Manikulus

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Hello, Dear Forum Users,

I have a Fiat Freemont, I live in Poland. I have my Freemont for two years and it was perfect up to now (225500km / 132000 miles ).

 

My car cannot start, the engine is working but it cannot start. I've checked errors with MultiEcuScan and I got P0304, there I have changed the sensor. Now I have U0401 Error in communication with engine control unit (ECU) and still, a car cannot start. 

 

Does anyone have any clue where to search for problems? I have a contact spray for electronics and checking plugs and grounding but up to now no success. All fuses look fine, no visible circuit break.

 

Thank you very much for any clue.

Mariusz

err1.jpg

2021-01-21_Freemont_Report2.pdf

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1 hour ago, Manikulus said:

Diesel, 2.0 Multijet II (CRD), 140 HP, FWD

That being I believe a Volkswagen motor that uses a timing belt and NOT a chain. Have you had proper service intervals followed such as Timing Belt replacement done? That code COULD be thrown from a belt that jumped a few teeth. You need to check the BASICS of proper engine timing. Also by Kms posted the Timing Belt should be replaced anyway., A worn Timing Belt can loose teeth and/or jump timing. Worst case is destroyed valves and pistons should the belt break.

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Thank you for the hint, it will be checked but in the workshop, I think it might be a bit complicated to do that outside where we have up to 5degC (39F). I hope nothing is damaged if this is a cause, I don't hear damaging noise...

 

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  • 2 weeks later...
On 24.01.2021 at 9:57 PM, 5rebel9 said:

That code COULD be thrown from a belt that jumped a few teeth

exactly three teeth, your diagnosis was right. A mechanic which was repairing was betting exactly about the same. Thank you for your hints.

 

Till the next one...

 

Warm greetings!

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