Why did I get the 'gearbox faulty' warning message twice in past 3 days?

atf oil in gearbox or faulty chaimber

fix the faulty solenoid valve then use a scanner to reset the ECM

Have the fault codes read. Replace faulty items. Use only genuine items as non-genuine replacement are not always compatible with the OEM fitted CPU units. check oil level on dip stick and make sure it is correct

Engine management warning light on ?????? What DTC'S - diagnostic trouble code's stored in the PCM - engine computer ? Should have DTC'S stored

hi this problem is caused by a geatbox fault , something is causing the fault code to bring on your warning lights , in this mode the gearbox locks up and the tourqe converter takes up the drive , when you drive of it feels like you only have 3 gear , change the oil and filter in the box and make sure you have the correct level of oil in the box , very important , td5 auto 192k

always treat a warning message as serious and have it check at an accredited service center
could be that the oil needs replacing, a problem sensor or wiring or clutch/band adjustment
although there are manufacturers that say the oil never needs changing(GM for example), transmission oil suffers from extreme temperatures and loads and these factors cause oxidation of the oil (burning ) that requires the oil to be changed on a regular basis (60,000-100,000 miles or 100,000 klm

it sounds like the sinchronizing rings are worn in the gearbox which means that the gearbox will have to be dismantled to repair, best to get the box fully reconditioned in this case

this sounds to me as the throttle position sensor or the air mass meter

Oil pressure sending unit fail often and give this false indication, but because the engine will be severely damaged if the pressure is really low so hook up a manual oil pressure test gage to see what the pressure is, if it is within specs replace the oil pressure sending unit.