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[fivestarmark]

i have a 03/1999 x25dt auto, the car has been standing for a couple of months, upon first use after about 10 miles, the gearbox seems to go into limphome mode, pulls away in third gear, and the sport and winter buttons dont function. if i then leave the car and go back a while later, all is fine again. used the car for a couple of days and all was fine, about 60 miles were covered. then the fault occured again.
i borrowed my freinds snap on scanner and no trouble codes were stored on transmission or engine ecu,s. but what i did observe that whilst monitoring the ecu,s on live streaming whilst driving, when the fault occurs the gearbox ecu will not allow me access. my first impression says ecu, but i have tried the transmission ecu from another vehicle( same bosch numbers on the unit), but this throws a code relating to shift pattern. does anyone know are the ecu ,s programmed ( software wise ) to suit whichever engine is fitted to the car. ( unfortuneately because the unit was from a specialist breaker i do not know which engine was in the donor vehicle ). pulling my hair out. thanx. mark

[TheBoy]

Welcome to site

G/box is programmed with the engine variant iirc.

Checking fluid level is the first step.

If its an AR25 (unlikely on later car) the engine does tend to chew these to bits after 100k

[TheBoy]

Additionally, there should be a code, either in engine ecu or in g/box ecu (most likely both) as to why it has limped.

[Marks DTM Calib]

With any auto box ault its best to start with the simple stuff.

1) Whats the mileage?

2) Is the gearbox oil clean and has it ever been changed?

3) Is the level correct?

Note, there is a maintenance guide on changing the gearbox oil.

[Markjay]

With any auto box ault its best to start with the simple stuff.

1) Whats the mileage?

2) Is the gearbox oil clean and has it ever been changed?

3) Is the level correct?

Note, there is a maintenance guide on changing the gearbox oil.

Welcome fivestarmark.

I don't have much experience with auto boxes, but from following the threads on this forum I can say that 90% of auto box problems are solved simply by changing the ATF and cleaning (or changing if required) the filter. Actual gearbox damage or faulty ECU seem to be quite rare.

As for the code reader, unless it is a proper GM TECH2 unit, odd reading is possible on some units, they are not all 100% compatible with the car.