Mitsubishi Repair & Maintenance Questions? Ask a Mechanic Online
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This is usually caused by a fault with a shift solenoid in the transmission/gearbox not engaging like it should or an issue with the valve body in the transmission/gearbox acting up needing replaced.If you have had any warning lights come on at all with this issue the first thing that has to be done is to have the fault codes read out/checked using a fully compatible scan tool or computer that will plug into your vehicle and can read all codes.Once this is done any codes set then need diagnosed to then locate and repair this fault here.
If no codes are set at all ( even if no lights came on I would have the codes checked) then the transmission/gearbox will have to be tested further to locate if this is an electrical solenoid needing replaced or an issue with the valve body itself.This usually requires some special test equipment and a transmission fluid pressure test gauge to do this.The repair costs will vary depending on what is at fault and can run anywhere from $150 to over $1000 in some cases.
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Mitsubishi themselves is usually the best option for this here as they will have the best experience in locating and repairing this fault.You can try an auto spark if you want as long as they have experience working on this model and transmissions/gear box repairs.
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It is also possible this is due to a worn band or clutch internal in the gear box needing replaced.This issue you see here can come on suddenly unfortunately.
The gearbox will need to be checked/tested further to pinpoint and repair this issue.