Error codes

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Mdrwtt
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Joined: 27 Jan 2025, 17:36

Error codes

Unread post by Mdrwtt »

Hi I've got these error codes up on my car do you think this is the ad blue pump or the eolys fluid pump or possible wireing or fault in ecu I'll attach the error codes thanks
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GiveMeABreak
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Re: Error codes

Unread post by GiveMeABreak »

To answer your question - BOTH!

One fault is to do with the Urea (Adblue) pressure and the other is a separate issue to do with the Multiplexed Eolys additive pump for the diesel particulate filter assisted regeneration system. Both are separate unrelated system and do different jobs.

However, your faults also point to 2 x 'U' code faults. 'U' code faults are related the vehicle's network system which means communications faults between the ECUs on the vehicle. So because you are getting comms faults to the BSI which is the controlling master computer on the vehicle, it may be this that is the problem rather that a fault with the actual Eolys pump and the Adblue pump.

The CAN wiring needs to be checked to see if it has a short or has been damaged, which may be causing the comms faults to the BSI from these two systems. So I do not recommend you start changing any parts until you have properly diagnosed the CAN wiring first, otherwise it can be a waste of money, as if the wiring is at fault then you'll still end up with a problem after replacing with new parts.

I would suggest you get it to a dealer with the proper diagnostic equipment or to a specialist who can deal with CAN systems and test the wiring properly.
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Marc
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xantia_v6
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Re: Error codes

Unread post by xantia_v6 »

Have you tried clearing those fault codes? The communication faults may be historic due to flat battery etc.