Engine codes and PCM
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Tuned
Joined: Aug 2005
Posts: 305
Likes: 1
Engine codes and PCM
I recently recieved an engine code of
543 Fuel pump secondary circuit failure Battery to control module Does anyone know if I need to replace a battery on the PCM or the whole PCM? Any help will be greatly appreciated, thanks
543 Fuel pump secondary circuit failure Battery to control module Does anyone know if I need to replace a battery on the PCM or the whole PCM? Any help will be greatly appreciated, thanks
Last edited by IB Tim; Aug 31, 2005 at 04:05 PM.
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Can you post in plain text? There's a lot of extra stuff in your post that makes it hard to read.
Can you also tell us anything about the vehicle? Year, model and engine would be great.
Can you also tell us anything about the vehicle? Year, model and engine would be great.
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
The computer monitors the switched side of the relay; the wire that goes to the fuel pump to make sure that it is getting voltage and basically verifies that the fuel pump relay is working. It could be an intermittent fuel pump problem or something else. I would clear it and see if it comes back. Nothing really needs to be replaced just yet. I think also that this code can be set by switching tanks while the truck is running, but I don't know for sure.
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