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: P0703 code on the C4500 no trans downshifting Acoombs 02-17-2008, 04:01 PM got a code on the c4500 today p0703 which is brake switch B Malfunction. The transmission isnt downshifting like it should when slowing to a stop. Is this the brake switch on the pedal causing the problem. Thanks. Acoombs 02-17-2008, 09:03 PM No ideas? HEADWRENCH 02-19-2008, 09:04 PM No ideas? Also have a friend with the same problem on his C4500,no code but the same problem,in fact he just called me,any help would be great guys. Acoombs 02-19-2008, 09:13 PM I found the code with EFI live. I didnt set a ses light, were going to replace the brake switch and see if that works Ill let you know. HEADWRENCH 02-19-2008, 09:18 PM I found the code with EFI live. I didnt set a ses light, were going to replace the brake switch and see if that works Ill let you know. Have they been having trouble with the brake light switch or should i ask is the brake lights on the rear of the truck also inoperative? | ||