My pajero 2005 model, having issue in shifting gears. From startup of vehicle its running in 3rd gear only. what will be the problem??

This is an automatic?
I have experienced manual transmissions that became engaged in two gears simultaneously that had to do with shift rails losing a detent ball. Similarly they would be engaged in the same gear all the time.

Tried to take neg off battery for 30 minutes? These vehicles have adaptive learning, (i have a mitsu galant), If that doesnt help you may have to go to dealer to have learning cleared.

05 Chrysler pacifica is a 4 speed automatic, next time buy a car with a 5 speed automatic

that can be repaired but requires removal of trans axle and disassembling and inspecting the gears for excessive clearance and shifting hub system.

take to a autobox repair shop for them to diagnose as not the sort of thing that can be done at home

ecu not sending correct signal

sorry jhbkane. ur solution doesnt work..i hav change my this ECU several times but still it dont work in winters...

And alibaba69: i hear this taka taka sound n my pajero mini sometimes when the gear shifts..i have placed a new fuel pump but still its there...Wots this..?? any suggestion plx

For car not changing gears it can be shifter assembly issue, or it can also be transmission issue. Get the shifter assembly inspected with ignition OFF.

For more troubleshooting, I suggest you to get the Following help link checked, its complete step by step procedure to inspect gear shift issues: -----

GEAR SHIFT ISSUES

http://alltypesofpartsreplacing.blogspot.com/2012/11/gear-shift-issues.html

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These will help.

Thanks.

The Transmission computer is the Achillies heel of many Mitsubishi vehicles , it sounds like your Pajero is in " limp home " mode which gives you third gear only.
See if you can borrow a replacement computer to try.
Mitsubishi scrimped on the quality of the capacitors in their computers and their failure rate is very high.
Happy hunting Marshall

I actually have the same problem just a few mos ago with my Pajero Fieldmaster 4M40 A/T. Is your speedometer working? My speedometer sensor is intermittently working if it does not work at all, the tranny will not shift to 4th gear no matter how hard you push the gas pedal to the limit!! I replaced the speed sensor and it goes back to normal now.