Hi guyz. I'm getting code 542 after replacing fuel filter and using inertia switch to shut off fuel pump. I also just put my catted h-pipe back on for smog. (542=fuel pump secondary circuit open or grounded. I cleared it with my scanner but i'm worried it might come back. Is this normal to give code 542 after shutting off fuel pump this way? Car is running fine. And will it affect smog check even though CEL is off?
code 542 real or ghost?
- Thread starter saleener94
- Start date
A lot of the time (if not most), it's just a ghost code. The fuel pump relay might have had a slight delay when latching, or even could have been caused by the inertia switch? If you have a 5 speed and stalled it at all, I believe that has been known to cause the 542 as well. I wouldn't lose any sleep over it. 
It should remain until you clear it out, but if it doesn't return, it probably just was a ghost code.
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