We have diagnosed with dtc p0776 .

Hello, Welcome to Just Answer My name is \*\*\*\*\* \*\*\*\*\* I've been an automotive engineer since 1996 and together we're going to solve this issue. to get that code it points to an issue with one of the control solenoids inside the automatic transmisson? how does the car drive with this fault? and what make, model , year and engine fuel type is it please?

Toyota Toyoace 2004It is diesel and the vehicle goes into limp modeJust typing is OK with me

Ok in that case I'd take a look at the colour of the transmission oil it should be a dark red colour if its black then its needs changing together with its oil filter. Also check its level with the gearbox warm and just after you've moved the selector through all the positions leaving it for a few seconds in each one and then back to park. You can top up the box through the dipstick tube if required and make sure you use the correct oil for your car as the fluids are not all the same. Some manufacturers recommended a change of the type of fluid - Speak to the local dealer and parts dept - they will advise you on the updated fluid to use.. If that’s all OK then check all the electrical connections of the gearbox, remove each connector in turn and spray with contact cleaner. Check that the wiring to the gearbox is in good condition with no chafing or frayed wire If this is OK then check the selector lever linkage / cable under the car for any broken parts and or missing bolts as if this is coming adrift then it can rub on the car body or just bind up Then - you should top up if low and re try it - or, if its level is ok - and condition is ok - then the next step is to drain it off - open it up and clean the filters inside -- refill and retry it..

The vehicle stop engaging gears whenever this check light comes on

OK so its very likely a low pressure situation then, I'd say dropping the sump pan off the unit and cleaning out the filter and then use fresh fluid should be the next step

Hi how did you get on?