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Faults and Technical chat for the Citroen Aircross
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BenEadir
Posts: 10
Joined: Wed Feb 21, 2024 2:20 pm

Post by BenEadir »

Hi,

I have a 2020 1.2L PureTech 96kW EAT8 which has been parked up since early July whilst I've been travelling.

I asked a neighbour to start it today and they got the following two error messages

Tyre under inflation detection system fault 18-09-2024.png

Parking brake fault  Have the vehicle repaired - 18-09-2024.png

Is it ok to initially ignore these as being likely caused by the car sitting idle for 10 weeks and drive the car to see if they re-appear once the tyres are inflated and the handbrake is re-applied or are they serious enough to warrant a tow truck to the Citroen garage?

If I was there myself I'd probably try driving the car for a few minutes to see if they clear.

Thanks.

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Juan Sheet
Posts: 1445
Joined: Sat Dec 04, 2021 4:59 pm

Post by Juan Sheet »

Car battery is the killer here - nearly 3 months and it will be quite depleted. You have to remember that the battery is being used by systems all the time, not least the car alarm and all the volumetric / perimetric sensors.

The tyres will likely have lost some pressure, so yes, you need to check all the pressures and reinitialise the TPMS system. But I would certainly get the battery on a charge for 24 hours at least.

As for the EPB, that may be because of the discs / pads / calipers seizing through inactivity and damp / corrosion.

I suggest that they are checked and cleaned up, with any rust brushed off and some brake cleaner applied.
BenEadir
Posts: 10
Joined: Wed Feb 21, 2024 2:20 pm

Post by BenEadir »

Thanks Juan, getting the battery charged for 24 hours and some air in the tyres might do the trick.
routemaster1
Posts: 386
Joined: Wed Mar 27, 2019 7:57 pm

Post by routemaster1 »

It may be an ABS sensor or system fault. The TPMS system uses the ABS sensors to compare wheel rotation speeds with the initiallised standard speeds.
BenEadir
Posts: 10
Joined: Wed Feb 21, 2024 2:20 pm

Post by BenEadir »

Thanks @routemaster1, it's been a bit of a drama but the garage has concluded that the battery (presumably depleted / not holding enough charge) is the cause of the various warnings.

I don't quite understand how a failing battery can generate Engine and Gearbox specific warnings but if the source and solution to the problem is truly is as simple as installing a new battery then happy days.

Time will tell.
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Juan Sheet
Posts: 1445
Joined: Sat Dec 04, 2021 4:59 pm

Post by Juan Sheet »

Because a lot of modern electronics require a certain amount of current to operate. Below a certain level they throw a wobbly. There can be in excess of 25 ECUs in these vehicles that all require power to operate and some without the engine running, so the importance of a good healthy battery can't be over-stated. A battery at 5 years of age should really be recycled and replaced.
BenEadir
Posts: 10
Joined: Wed Feb 21, 2024 2:20 pm

Post by BenEadir »

Sounds like good advice @Juan Sheet, especially as I tend to leave the car garaged for up to 3 months at a time due to work and other commitments.
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