# 543 ford fault code

**URL:** <https://community.cartalk.com/t/543-ford-fault-code/40049>\
**Category:** Maintenance/Repairs\
**Tags:** ford, taurus\
**Created:** [November 27, 2009, 10:39pm UTC](https://community.cartalk.com/t/543-ford-fault-code/40049 "2009-11-27T22:39:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![russharv63](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@russharv63](https://community.cartalk.com/u/russharv63)\
**Post date:** [November 27, 2009, 10:39pm UTC](https://community.cartalk.com/t/543-ford-fault-code/40049/1 "2009-11-27T22:39:36Z")

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I have a 1993 ford taurus 3.8L V6 automatic GL with 127,500 miles. I had a problem getting my car started last week and hooked up a ford OBD 1 digital code reader and got a 543 fault code. The 543 fault code definition read: fuel pump secondary circuit fault. What does this code mean? Someone told me it means my relay control module is going bad. Is this right?

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**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\
**Post date:** [November 27, 2009, 11:03pm UTC](https://community.cartalk.com/t/543-ford-fault-code/40049/2 "2009-11-27T23:03:51Z")

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It could be the fuel pump relay itself and/or the fuel pump. I’d start with the relay, and if that doesn’t get it, then the fuel pump. There are other possibilities, but those are the most likely two. (Sometimes a failing fuel pump can overload the relay and kill it too.)