Hi everyone im new here trying to find out what’s going on with my car wich is a jaguar xjr 2004 i replaced the gearbox, at first drove fine but after went into limp mode and i got some fault codes ill upload the pics

Two items to check. First, use a voltmeter across the battery terminals to check the available battery voltage with the ignition in the OFF position for at least 30 minutes. There should be a minimum of 12.6 volts available. Many instrument cluster warnings and DTCs are the result of low available voltage.

Second, if the gearbox was recently overhauled or replaced, check the electrical connections at the mechatronic sleeve plug on the side of the gearbox for oil residue or poor connections. The TCM, which is inside the gearbox, is not communicating with the ECM/PCM via the plug and wiring loom.

Wow that was quick response thank you so much buddy, ill try to unplug that connection i remember some dirt went into it and i used electical spray to clean it probably there is still some dirt in there, battery is new so definitely ill check that connection