• Hi guys dunno if you can help me 

I have a 2004 mk6 fiesta AUTOMATIc

my car won't start ignition comes on but not turning over I have an error code on 

P0657 actuator supply voltage A circuit Error 

Hi, the P0657 code is triggered when the powertrain control module detects an issue in the supply voltage to the A circuit. In a closed circuit the voltage is effected by resistance of the components and the supply of power. May be worth looking at the battery to see if it is still supplying the 12v it is designed to, if it isnt you can try charging the battery on a battery charger or buying a new one.

Anything beyond that will need more in depth diagnosis, but what I said above is the limit of my knowledge. 

Hope this helps 🙂 

i'm not familiar with the automatic version of that car. I mainly know about older cars.

In the old days there was a switch around the bottom of the gear lever. The switch was activated when the lever was in Park. In other positions the switch was not activated and that stopped the starter motor from operating.  I had a Granada which wouldn't activate the starter motor. I found a wire had come off the switch that checked it was in Park. Reconnected it and it was fine.   I do not know if a Fiesta also has such a switch that checks it has the lever in the Park position, and if it does, I do not know if it is under the gear lever or on the gearbox.  I do not know if the 2004 fiesta would have a simple thing like this or if it is 100 times more complicated

That is a very good point, check it is in park and your foot is on the brake. Had the same issue with a family friend who got an auto and couldn't start the car! 

Hi guys I've put a new battery on so deffo not that 

and put the car in park with foot on break actually tried it in every position possible 

17 hours ago, spaxboyz said:

Hi, the P0657 code is triggered when the powertrain control module detects an issue in the supply voltage to the A circuit. In a closed circuit the voltage is effected by resistance of the components and the supply of power. May be worth looking at the battery to see if it is still supplying the 12v it is designed to, if it isnt you can try charging the battery on a battery charger or buying a new one.

Anything beyond that will need more in depth diagnosis, but what I said above is the limit of my knowledge. 

Hope this helps 🙂 

I've put a new battery on it i thought the same I know a little bit about cars but this is baffling me 

 

 

1 hour ago, Loopylou19871 said:

I've put a new battery on it i thought the same I know a little bit about cars but this is baffling me 

 

That is strange, unfortunately I am at the limit of my technical knowledge about circuits 😕

You need someone else who has same model automatic to say whether or not theirs only starts in park and or with foot on brake. If so I think you need to be looking at switches/sensors that tell the car it is in park and or foot on brake. Do you know from using yours that it would previously only start in park, or you might not ever tried starting it when not in park. In my experience of older cars it was the norm to have that safety feature so it could only be started in park by using a switch somewhere round gear linkage or on gearbox

Do you have breakdown cover. A good experienced breakdown man might know what to check and fix it. In my experience they vary a bit in skill and ingenuity

 

5 hours ago, spaxboyz said:

 

That is strange, unfortunately I am at the limit of my technical knowledge about circuits 😕

All that it's a fuse check with my multi meter as us woman do and found a fuse giving weird numbers and changed it and guess what it only started lol

4 hours ago, isetta said:

Do you have breakdown cover. A good experienced breakdown man might know what to check and fix it. In my experience they vary a bit in skill and ingenuity

 

Naaa leave it to us women found the issue was a fuse 

I bet you were mightily relieved. When anything goes wrong on a car these days you just kind of think its going to cost the earth

1 hour ago, isetta said:

I bet you were mightily relieved. When anything goes wrong on a car these days you just kind of think its going to cost the earth

I was very smug when I called my hubby and told him I fixed it 

What made the fuse blow or go high resistance?

That is what I would be thinking......

I have spoken to a friend and he says the following... 

He believes it is a pwm circuit or an voltage regulated circuit. From that code he believes one of the internal sensors in the transmition has developed a fault. He recommends the best plan of action is to take it to a transmition specialist to further diagnose due to to sheer amount of sensors in an automatic transmission. 

 

Hope this helps 👍

Or just a corroded fuse. Well done loopylou, that's the right way to do it. Now it is fixed, don't go looking for trouble.