Restricted performance Gear box fault

[Warrzone]

Some days i like my D2 better, yesterday was one of those days.

2010 D4 2.7 175,000km
has had gear box serivced approx 70k ago due again, but no issues

What happened
Yesterday while driving approx an hour on a 2 lane freeway cruising along at 100km
cruise control set, in D in 6th gear
40c day.
gear box and car working 100% fine, smooth shifts ect.
not towing, or any weight in the car.

I got the message, Restricted performance, gear box fault. twice.
stopped reset, drive again.

back to 100km for about 5 mins cruise on fault again.
reset drove with no cruise on left it in 5th no fault (i was nearly home) about 15 mins to go no more faults while driving around town.

I haven't scanned the car yet, I'm planning on getting a scan from a mechanic during the week.

my questions if an answer is possible with the above info and no scan.

What causes this type of fault?
in restricted mode it felt like the car had no drive, foot flat to the floor, and the car kept slowing down. i would be lucky to drive at 40km is that normal?
scale of 1-10 10 being a new 8k gearbox job how worried should i be?
would it be okay to keep driving?
is it more likely to be a sensor ect playing up?
is there anything i could check my self to narrow down the cause?

thank you everyone for you time.
Ben

[BradC]

What causes this type of fault?

Driving a Landrover.

There are loads of potential causes. In general a fault on the Engine ECU will alter the messages it sends out on the CAN bus and this causes the other downstream ECUs to register faults. So the chances of it being a transmission fault are very low. More likely something like an EGR, DPF, Turbo or it just happened to be Saturday and you held your mouth wrong.

Without reading codes pontificating about causes will be about as accurate as reading tea leaves.

i have found for engine faults, any generic OBD-II code reader will get codes, but you won't be able to grab from any other ECUs. A dedicated tool such as the Gap IID is pretty much essential with one of these complicated beasts.

[loanrangie]

I can't see your location from my phone but if you are in Melbourne I'm happy to plug my gap tool in.

[Warrzone]

thank you very much for the offer but I'm in the western suburbs of adelaide. But feeling the land rover community love all the same. thank you.

Anyone in Adelaide want a 6 pk of beer for a quick scan let me know. I will have to invest in one soon.

[justinc]

Almost certainly an overheat / overtemp issue brought about by towing in high ambient temp with cruise control...
These vehicles have lots of self protection, starting with fuelling reduction and aircon shut off to help cooling, engine and main vehicle faults from trans temps, overboost protection from over working it while in 6th gear in cruise control...only way to see is wait for scan tool results. GAPiid is a good start...

[DiscoJeffster]

Almost certainly an overheat / overtemp issue brought about by towing in high ambient temp with cruise control...
These vehicles have lots of self protection, starting with fuelling reduction and aircon shut off to help cooling, engine and main vehicle faults from trans temps, overboost protection from over working it while in 6th gear in cruise control...only way to see is wait for scan tool results. GAPiid is a good start...

Bit he wasn’t towing?

[Graeme]

Check the top I/C to throttle body hose for a split underneath.

[justinc]

Oops, brain fade.

[scarry]

Check the top I/C to throttle body hose for a split underneath.

Good call,

Just changed mine,it was shagged.

[Trevor Cock]

Have sent PM re IID tool.
Trevor