Charge Station Fault when using a J1772 Extension Cable when preconditioning the MME

[bellyer]

I recently purchased a J1772 Extension cable (link to the exact one is below) to use with my Grizzl-e EVSE. The Grizzl-e has been great with my MME the past 18 months or so, but I recently also bought a 2023 F-150 Lightning that I need to charge outside of my garage. The extension cable works great when charging my Lightning and, at first, it worked fine with charging the MME. However, lately, every time I use the extension cable with the MME, Fordpass alerts me to a Charge Station Fault in the app, even though the EVSE still seems to be charging the MME. Anyone have any thought on why this might be? Is it possible the additional load when preconditioning is more than the cable can handle?

The cable I have is this one - https://www.amazon.com/gp/aw/d/B07VWWDMNV?psc=1&ref=ppx_pop_mob_b_asin_title

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[Mach-Lee]

Don't know unless you read the SOBDM codes or send your VIN.

Sure you're clicking it in all the way?

 

[bellyer]

Don't know unless you read the SOBDM codes or send your VIN.

Sure you're clicking it in all the way?

I am definitely clicking it in all the way. My VIN is 3FMTK3SU2MMA08219 if you are able to look something up that helps to pinpoint what is happening here.

 

[Mach-Lee]

I am definitely clicking it in all the way. My VIN is 3FMTK3SU2MMA08219 if you are able to look something up that helps to pinpoint what is happening here.

No recent telemetry, P0D56 code history seen before Christmas. See my TSB on that code: https://www.macheforum.com/site/threads/tsb-tight-j1772-plug-causes-charge-station-fault-message-p0d56-code-and-possible-12v-battery-drain.23525/

EDIT: P0D56:64 code seen, not same as above.

 

[Mach-Lee]

I am definitely clicking it in all the way. My VIN is 3FMTK3SU2MMA08219 if you are able to look something up that helps to pinpoint what is happening here.

Ignore my previous post, I didn't read the whole code carefully. You have a P0D56:64 code which means signal plausibility failure. This occurs when the car senses the pilot signal from the EVSE, but does not see the proximity signal from the J1772 handle. This could be due to a bad connection with the plug, or a faulty unit. The proximity signal is a loop through the J1772 handle that tells the car it's connected, and is affected by whether or not the release button is pressed down. A bad resistor or connection in the switch could cause it.

Not sure how handy you are, but you can take some resistance (Ω) measurements of the handle to test it if you want?

 

[SWO]

Maybe the onboard charger is not liking the voltage drop it's seeing from the extension cord?

 

[Mach-Lee]

Maybe the onboard charger is not liking the voltage drop it's seeing from the extension cord?

That's possible but usually it will drops the amps and continue charging at a reduced rate without setting a fault. The voltage would have to be less than 148V to set a fault, which would be one hell of a voltage drop.

 

[bellyer]

Ignore my previous post, I didn't read the whole code carefully. You have a P0D56:64 code which means signal plausibility failure. This occurs when the car senses the pilot signal from the EVSE, but does not see the proximity signal from the J1772 handle. This could be due to a bad connection with the plug, or a faulty unit. The proximity signal is a loop through the J1772 handle that tells the car it's connected, and is affected by whether or not the release button is pressed down. A bad resistor or connection in the switch could cause it.

Not sure how handy you are, but you can take some resistance (Ω) measurements of the handle to test it if you want?

Thank you! That is super helpful. I don't have the a multimeter in hand presently, but can pick one up at some point. Any risk of damage to the MME or the EVSE in this situation?

 

[Mach-Lee]

Thank you! That is super helpful. I don't have the a multimeter in hand presently, but can pick one up at some point. Any risk of damage to the MME or the EVSE in this situation?

The only risk would be while unplugging, with an inoperative proximity loop the car doesn't know you're about to unplug. The load on the circuit needs to to be zero before unplugging otherwise an arc can occur as the plug disconnects. When you press the J1772 release button you should hear the EVSE click off, if not don't unplug and stop charging a different way.

I don't think it will allow charging without the proximity signal however?

 

[RickMachE]

Sounds like the extension cord is faulty?

 

[Mach-Lee]

Sounds like the extension cord is faulty?

Yeah, it would be a problem with the circuit inside the J1772 on the extension cord. Those no-name Chinese brands aren't exactly made to quality specs.

 

[markboris]

I recently purchased a J1772 Extension cable (link to the exact one is below) to use with my Grizzl-e EVSE. The Grizzl-e has been great with my MME the past 18 months or so, but I recently also bought a 2023 F-150 Lightning that I need to charge outside of my garage. The extension cable works great when charging my Lightning and, at first, it worked fine with charging the MME. However, lately, every time I use the extension cable with the MME, Fordpass alerts me to a Charge Station Fault in the app, even though the EVSE still seems to be charging the MME. Anyone have any thought on why this might be? Is it possible the additional load when preconditioning is more than the cable can handle?

The cable I have is this one - https://www.amazon.com/gp/aw/d/B07VWWDMNV?psc=1&ref=ppx_pop_mob_b_asin_title

I agree with the others and sounds like it might be the circuit or switch inside the J1772. For what it's worth, I've been using an aftermarket extension for months (actually replaced my original EVSE cord with it) and so have two friends of mine, one with a Mach-E, one with a Lightning. We haven't had any issues and while it probably is a product from China, it feels and works like a quality piece.

https://www.amazon.com/gp/product/B0821HJMJB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 This is the 40ft one I have but there is also a 20ft version.

 

[SWO]

That's possible but usually it will drops the amps and continue charging at a reduced rate without setting a fault. The voltage would have to be less than 148V to set a fault, which would be one hell of a voltage drop.

Wow, didn't know the set point was that low.

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