chippy wood

i am having a gearshift problem on my ml270cdi.when it shifts up to 4th gear it revs as if slipping then carries on,more revs more slip .i have these codes,p2600 the voltage supply of circuit 87 has undervoltage, and p2500 the transmission has an impermissible transmission ratio. if there is anyone there that knows what the problem is and a possible solution it will be greatly appreciated,

Plutoe

Yep, you need a transmission scan to tell you why P2500!!

Maj. Dundee

Please UPDATE YOUR PROFILE in USER CP.