Broken down

[James]

Any ideas please?

I was driving when suddenly engine stopped and all lights came on on dash. Managed to coast to roadside. Head unit screen flashed and lights all died on dash as if power loss. 
after 20 minutes I put key in and it restarted!

the car has had a differential replaced a few months ago new bushes and brakes just a few days ago!

have not tried driving again yet as concerned Sam may happen in a dangerous location!

 

any suggestions what might be the problem?

Computer control unit??

 

[Gamith]

I would do a diagnostic test to see what comes out (if you have a diagnostic tester), but at a guess I would say it's likely to be a loose connection or earth - something that hasn't been put back properly after the recent work. Check battery terminals first and see whether they need tightening, then look around for loose cables.

[Jeza]

Check the engine earth strap as well

[James]

Thanks all.

update. Recovery to garage who after a few days decided it was the battery that had died.  They took it on a drive with replacement battery and after 200m the car died and needed recovery. Any further suggestions please?

the rac man found the alternator was charging but thought it had a noise that made him turn think it was failing. Garage found alternator ok. Could it be alternator is causing the problem?

I also had noted prior to breakdown that when I braked sometimes there was a noise and the brakes would sometimes apply sharply despite me only breaking very lightly. Brake pads had been replaced and had work check by another garage who said all was ok.  
I wondered if the problem might be associated with the regenerative braking system??

any thoughts gratefully received. Thanks 

[Michael Brown]

The Inverter vertually runs the Alphard, get it checked over by a specialist

[smurf]

When you say it had a differential changed, do you know exactly what was changed? The gearbox is quite a complex and unusual piece of equipment, and I'm surprised you found a garage willing to replace a component of it.

 

You need to take it to a hybrid specialist who understands Alphards and has the correct diagnostic equipment or you will waste more time and money with garages taking a guess after two days, or RAC mechanics that think the car has a dodgy 12V alternator (it doesn't have a 12V alternator). 

 

There is a hybrid specialist in the Exeter that travels https://www.hybridrepairservice.co.uk/

 

Another alternative is this guy in Wigan that seems well regarded. You would have to get the car trailered up there though. https://www.facebook.com/Vjkomix