Well it had to happen finally - last night as I was leaving London to head home to Wales I lost all engine power, the dashboard lit up and I coasted to a stop on the outside lane of the A41. Car would crank but not start. After a long wait the RAC come out and poked about and eventually decided it was the fuel pump. Arranged recovery and gave me the name of a garage who would replace it today.

When I unlocked the car the previous evening after being in the sun all day, there was a high pitched squeal for about 20 seconds from under the bonnet - which I think is the cooling fan in the ECU box. It didn't do it last night when I got back to the car.

The RAC patrol plugged in to read the codes and said there was nothing logged that was relevant, but he did read code P1616 Electric Thermostat Circuit High.

I'm thinking the ECU fan may have blown and the ECU's shut down as they got too hot. Car has been recovered to outside where I'm staying but between the patrol and recovery they have flattened the battery so I can't test my theory that it will start this morning now its a lot cooler. I have the garage coming out this morning to recover the RR to them - should I get them to check the ECU cooling fan first - I assume if the ECU bay temperature got too high because the ECU cooling fan has packed up, that would throw code 1616 and shut down the car to protect itself?

Thanks for any advise
Nick Current Fleet:-
2018 Discovery 5 3.0 HSE
2021 Ford Ranger Wildtrack
2019 Ford Mustang Bullitt 5.0 V8
1993 Defender 90 200TDI Pickup

Gone - not forgotten
2016 L405 4.4 SDV8 Vogue SE
2012 L322 4.4 Westminster
2004 L322 4.4 V8 Autobiography LE
2000 P38 RR 4.0 HSE (ex Clarkson test car)

It's possible I suppose. I think the fan runs regardless so there isn't anything monitoring it working or not. Years ago I took mine out and gave it a skoosh with lubrication stuff to stop it squeaking. V8 or else ...

Thanks - I was more thinking that if the fan had failed the ECU's would have got too hot and shut down much like a computer if it gets too hot, rather than thinking that the ECU's had shutdown because they detected the fan had failed? Does that sound more likely? Current Fleet:-
2018 Discovery 5 3.0 HSE
2021 Ford Ranger Wildtrack
2019 Ford Mustang Bullitt 5.0 V8
1993 Defender 90 200TDI Pickup

Gone - not forgotten
2016 L405 4.4 SDV8 Vogue SE
2012 L322 4.4 Westminster
2004 L322 4.4 V8 Autobiography LE
2000 P38 RR 4.0 HSE (ex Clarkson test car)

IMHO I think you would have to sit in traffic in Death valley for a few hours for it to get that hot in the box.....  Pete

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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Parchment over Navy Interior. Sold
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand, Jet Interior. Sold
2002 L322 Vogue 4.4 V8 Epson Green, Ivory over Aspen Interior (Fatty Offroader) Sold
-Click for Project Fatty off roader-