Technical u0422-81 & u0426-68 fault codes

[nicework1]

My 2012 fiat 500 will not turn over, the fuel cut off is on and the dashboard shows errors with start stop not working and broken DLR. I've tired to manually turn off the fuel cut off but it doesn't do anything. I get no crank or anything, almost like the key does not exist, I've changed the battery in the key fob as the remote locking was not working and charged the car battery but still noting, any ideas?

Thanks

 

[the green vanper]

Hello,

When you turn the ignition on, does the immobilizer light goes off?

No idea if it appears in the center of the display, or is a light around it, but should look like that:

 

[nicework1]

Hi,

No it stays on.

 

[the green vanper]

So, it won't start. It's an anti theft solution.

There are I think some threads on the immobilizer diagnosis on the 500. I've even added a photo and explained how the keyfob works.

Have you got a spare key?

 

[nicework1]

Ok thanks, no I just have the one key. Would a auto locksmith be able to check the key is working?

 

[the green vanper]

Here's my explanation how the keyfob works:

Key transponder woes | FIAT Panda (2012+)

Hi all. 2012 Panda only one key and no code card. Bought five years ago always meant to get a new key cloned when living in London and never got round to it. Kicking myself now. I live in semi rural France so don’t have access to anyone that can plug into the car and deal with it all. Had a...

www.fiatforum.com

I assume yours is same.

 

[nicework1]

Ok thanks, yes mine is the same.

Would this also throw up the fuel cut off error? I checked the battery health and it’s only 8% but reluctant to replace until I can get it running

 

[the green vanper]

There will be no fuel pressure / spark until the immobilizer is active.

The only way to mesure the battery health is a load tester, the electronic ones mesure the voltage and resistance and 'calculate' the health... What's the battery voltage?

If below 12 V, charge the car battery first. With a good charger, one which can make the density of the electrolyte. Not a cheap 'smart' lidl charger, if a 'smart' one, use Noco, ctek or another reputable brand.

If your car is equipped with start&stop system, check for the battery type and adapt the charging method.

 

[nicework1]

I charged the battery yesterday with a noco charger, Topdon battery tester shows 95% charge battery health 8%

I’ve just taken the key fob apart and looks to be broken to me round the chip? That would not affect the transponder know, as it’s not connected to the circuit?

have seen a few people on eBay repair keys.

 

[John202020]

Note the "remote " has nothing to do with the immobiliser, as in the non remote key, the transponder chip is separate, whilst the remote might not say open the doors it's different to non crank?

 

[the green vanper]

I charged the battery yesterday with a noco charger, Topdon battery tester shows 95% charge battery health 8%

I’ve just taken the key fob apart and looks to be broken to me round the chip? That would not affect the transponder know, as it’s not connected to the circuit?

have seen a few people on eBay repair keys.

Is the transponder on the other side of the PCB?

 

[nicework1]

saw

Note the "remote " has nothing to do with the immobiliser, as in the non remote key, the transponder chip is separate, whilst the remote might not say open the doors it's different to non crank?

Thanks i thought that might be the case but was hoping it might be a simple fix, now im not sure, dont want to waste money on a replacement key if it isn’t that

 

[the green vanper]

Quite recent thread here:

U0422-81 + fuel cut-off + triangle of doom + unable to connect to airbag ECU = ? | FIAT 500 (2007+)

Hi, really hoping someone can help me with this, I've read a lot accounts of similar problems but not this exact set of symptoms : Some time ago, got lit airbag lights, triangle warning light, 'fuel cut-off' and 'stop start' warnings on my MY2010 500 1.2 Lounge. Car functioned as normal...

www.fiatforum.com

Another ones here:

The engine turns over but no start | FIAT Grande Punto

This is a weird one, This is a 2007 GrandPunto Duralogic, the doors lock and unlock with the key, when I put the key in and try to start the car nothing happens, if I turn it off and try again, the engine then cranks for about 5 seconds but will not start. codes U 1705-87 Receiver Radio (NRR)...

www.fiatforum.com

Dead Please Help | FIAT Panda (2012+)

Hi all Our Fiat Panda 2014 plate Automatic suddenly wouldn't start, here's what happened. We'd gone out about 30mile and parked up for a cupper, on returning to the can about an hour later I put the key in all the normal lights came up went to start it but there was nothing, no crank nor any...

www.fiatforum.com

No resolution though

I'd start by posting in the recent one, perhaps the OP's still there.

In general the U0422 errors mean a communication problem between the modules, the one is described as U0422-81 / Inertia switch problem and the other one as U0426-68 / Immobilizer - Event information.

What happened before the problem appeared?

 

[nicework1]

Ok thanks I’ll comment on the post hopefully they fixed it and can help.

It just died

 

[John202020]

Could be the receiver ring on the lock barrel ?

 

[the green vanper]

Could be the receiver ring on the lock barrel ?

Could be. Could be a broken wire somewhere, a short in the connectors, a damaged module (BCM, ECU, airbag). Could be a lost / damaged transponder in the keyfob.

 

[nicework1]

Thanks, the batteries toast so I’m going to start by getting a new one. Fuses and relays all look fine and no obvious broken wires, have seen a company on eBay will disable the immobilizer in the ecu.

 

[steveras57]

Thanks, the batteries toast so I’m going to start by getting a new one. Fuses and relays all look fine and no obvious broken wires, have seen a company on eBay will disable the immobilizer in the ecu.

If you decide to disable the immobilizer then dont forget the insurance implications!

 

[the green vanper]

No idea if you've read my post I've linked to in #6, but you can program the keyfob (both central locking and immobilizer) with MultiEcuScan. In your place I'd do TWO keys(fobs) at the same time to have a spare.

 

[nicework1]

No idea if you've read my post I've linked to in #6, but you can program the keyfob (both central locking and immobilizer) with MultiEcuScan. In your place I'd do TWO keys(fobs) at the same time to have a spare.