wrecker704

I have a 2004 1500 with 4.7 and it won't start.obdii showed Pcm short to ground. Well I changed the crankshaft position sensor ,it tried to start and died. Swapped it out for another one and did a hard dump and it did the same thing. HELP PLEASE!

Iowan

Wish I could help, computer took the think away from me in 83.

RacerHog

A very common problem with those is the ignition switch goes bad....

wrecker704

Does anybody think the cam position sensor might be bad? I really know, but would like to try a couple of things before I buy a pcm. Thanks

wrecker704

HELP!! PLEASE!!!!!

RacerHog

Possible.... have you been able to pull up any codes?

wrecker704

The only code said pcm short to ground. That was the only code. I just ran through a lot of water when it flooded around here. The truck never stalled and run good after that. Then went to start it and would not start. Checked the connections on pcm. Nothing corroded or off. After I replaced the crank position sensor it ran two different times, but I did not drive it.. The next day it would not start. Replaced the crank sensor again and it has tried to start twice, but did not start. HELP PLEASE!

RacerHog

Make sure the fuses are not blown in the distribution block... Check the fuses that are a little hard to get too.. The one under the Black fuse tab... The yellows are the ABS and SSR and should not affect the running part at the moment.

Some times you try to pull codes and a bunch come up... Check the fuses that I just talked about...
Sounds to me like you have no communication to the PCM...

Just my 2 cents..

wrecker704

What is the black fuse tab and where is it located? Is that the fuse block under the hood? Thanks again racer hog because I don't know where to go from here. I would hate to take it to the dealer.

RacerHog

Yes located under the hood... The big black box with all the fuses....
I know how you feel about taking it to the dealer... But when you start looking at the big dollar items... Some times, its better... The Dealer scan tools (DBR) are very pricey when you are trying to fix you own unit.