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Engine/Transmission (1998.5 - 2002) dtc 602

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2nd Gen Non-Engine/Transmission Mirror Swap

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i triped this 602 code with means a ecm problem. i was told to have it reflashed at dealer. tried to but mechanic said it hade already been done on my ecm. was told i hade to replace the ecm. do i have any alternatives. all help is greatly appreciated.
 
Is the truck running?



I just went throught the ECM replacment mode. One day the truck started and sounded like it was backfiring, rough, and would not come to speed. Had error codes stating that the ecm failed to communicate the the injector pump (P1689) and a bunch of others. End results I had to purchase a rebuilt ECM. The don't make new ones for the 98's. The truck runs like a new one now and I'm very pleased.



First thing I would try is disconnecting the batteries and making sure all the wire connections are good and clean by using electrical contact cleaner and di-electric grease. Make sure there are no wire breaks or chafted spot. Don't forget the connection to the injector pump. Also make sure all the grounds are good and clean! It seems like bad grounds on these Dodges cause alot of problems in the computer side.



If it comes down to replacing the ecm it will cost about $750. It's easy to replace but getting one is the trick. I got ripped off by ECM Outlet out of Detroit. They took the ECM and never fixed it. End result it cost me $200 because I lost the unit as a core return. I got mine from GoECM.com. They not only rebuid them but will also program them for you. I think they were great.



Good luck.
 
i triped this 602 code with means a ecm problem. i was told to have it reflashed at dealer. tried to but mechanic said it hade already been done on my ecm. was told i hade to replace the ecm. do i have any alternatives. all help is greatly appreciated.



More info might help,if you have used a downloader of some type they can trip that code. Depending on what year truck you have some can be reflashed with the same 'ware again. If you have a friend in the area with a Smarty that can be used to reload the software before giving up on the ECM
 
the truck is still running. i tripped this code one cold night back in march. truck started hard which it never did before. got it started heading home took off from stop&it coughed hard at say 25mph, thouht just combo of cold&some of my homemade bio fuel(i'vbeen making&running for years now). i figured out the fuel was shutting off instantly but only momenterly. this contiued to happen untilend of june when it straightened it self out. but. this would happen most often when i was just slightly on the go pedel& sometimes when i was just creeping. it would happen at 55mph & lockup the back tires, scare the blank out of me. i believe the ecm went bad due to a bad voltage reg. in my altenator which took out a bunch of other elec.components. it went bad shortly after i got the truck 7 years ago. the truck has always kind of bogged off the line since i started putting on mods. it has a industrial ijection hotrod pump,150hp injectors hybrid hx40/35 turbo smarty tuner set on level7 quadzilla fuel box set on level3 k&n filter 4in turbo back cool dual mbrp exshast fass fuel 150 fuel system o,ringed head autometer gauges atd built trans w/tripledisc billit converter &input shaft. with all this i can only build 10psi of boost while brake torqueing it and it will NOT break the tires loose. on wet road no problem. i thought for the longest time i just had a stubborn traction control ecm. everyone i talk to said a smarty tuner would fix me up. gave nice power but same issues off the line. once i tripped this 602 code took it to dealer to reflash ecm. found out it had already been done on this truck & can only be done once on these ecm's. i now think its been bad since alt. went bad years ago. i'm going to write a new post about batteries & bad alts. but if someone has another fix for me PLEASE HELP!!! THANKS.
 
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