When the car is travelling at about 40+ mph, it has not issues. But when driving for about 20 mins and getting stuck in traffic for about 5mins, the gearbox locks into 2nd gear and the engine, ABS, traction, battery lights come on, the revs need keeps dropping and the gear postion shows -- instead of P 1 2 3 etc... It's the AF40 model gearbox on a 1.9 diesel, 06 plate.

The engine temp can be around 80 to 88 & gearbox temp 80 to 85 when this happens. Then when turned off & left to cool off 20mins, drives ok. I have tried the following to fix:

New engine oil & gearbox oil,

New battery,

New thermosat & coolant and coolant level sensor,

New fuel filter,

Cleaned EGR valve,

Replaced engine ECU,

Cleaned MAF.

OP-COM shows more than 10 errors after this happens and the TCM shows as "not present ???" until the car has been left off for 20 mins, then it's ok.

Running out of ideas, could the TCM be faulty? Any ideas would be great, thanks.

Edited by macaphee on 02/07/2016 at 19:48