u0401:82-08 Code and other issues, can you help me please?

[MarkM]

Hi,

I have a thread on here from last June where I had a P166A fault code, car died and wouldn’t start for 10 mins, then started and ran ok with the wrench symbol on the screen but no MIL..

In and out of Ford, couple of other mechanics and a couple of auto electricians later, no issues found, it would randomly appear and disappear. The only actual work or change was the battery which didn’t cure things.

Today as the weather was great I went for a drive, then, on the way home, taking off from a set of traffic lights at low speed it died again, right in the middle of the junction, some good people helped me get it to safety and it turned over but wouldn’t start.
I have Forscan lite, so plugged the dongle in, screen shoted the codes and cleared them, started and drove home 30 ish miles with no issues.

Here is what I found…….

At home I did a self test which also flagged these,

Bearing in mind I’m not a mechanic but feel very much on my own with this as no one anywhere near me seems to have the knowledge or desire to help.

Browsing some live data, I found this….

Can anyone make any sense of this and give me some direction please? It’s been 9 months since my original issue and I’m losing the plot :(

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[DonnieO]

I don't know if any of this will help. I'll post some links to the codes

https://www.f150forum.com/f118/2016-5-0-wrench-light-552501/

 

[WildHorse]

Check the fuses ?

 

[MarkM]

I don't know if any of this will help. I'll post some links to the codes

https://www.f150forum.com/f118/2016-5-0-wrench-light-552501/

Thanks, I’ll have a look

Check the fuses ?

yes, all ok, no corrosion present :(

 

[MarkM]

I don't know if any of this will help. I'll post some links to the codes

https://www.f150forum.com/f118/2016-5-0-wrench-light-552501/

nothing there that applies to me unfortunately, pin pint test for the initial code was done last year with no issues found, thanks though!
It’the U0401 code that is my main issue this time I think!

 

[DonnieO]

nothing there that applies to me unfortunately, pin pint test for the initial code was done last year with no issues found, thanks though!
It’the U0401 code that is my main issue this time I think!

What have you looked up about the u0401 code? Just asking so I don't give you information you've already read.

Have you reprogrammed the car to what it was factory? Like a factory reset?

 

[MarkM]

What have you looked up about the u0401 code? Just asking so I don't give you information you've already read.

Have you reprogrammed the car to what it was factory? Like a factory reset?

I’ve not found very much Mustang specific for the U0401.82-08, lots of dealer did this and that etc but no specifics of what I could look fo, like I said, I’m on my own with this and think this time the car may have to go :(

I reset all the modules, including pcm and Bcm

 

[DonnieO]

It seems to be pcm/ecm problem from what I can gather.


Have you had the charging system checked? The pcm/ecm could be bad as well. Have you checked the floors for water?

Has your cars software been updated? Have you tried a custom tune?

This is from kbb

https://www.kbb.com/obd-ii/u0401/

 

[MarkM]

It seems to be pcm/ecm problem from what I can gather.


Have you had the charging system checked? The pcm/ecm could be bad as well. Have you checked the floors for water?

Has your cars software been updated? Have you tried a custom tune?

This is from kbb

https://www.kbb.com/obd-ii/u0401/

Thanks

Not checked the charging system.

Different tune was added, that’s one standard, one canned and one custom and still the same!

Modules were meant to be updated

Looking like Bcm/pcm, Fingers crossed it’s not :(

 

[DonnieO]

This is a long shot but maybe @Rolls *fingers crossed* could provide some information on the code.

 

[DonnieO]

Thanks

Not checked the charging system.

Different tune was added, that’s one standard, one canned and one custom and still the same!

Modules were meant to be updated

Looking like Bcm/pcm, Fingers crossed it’s not :(

Check ebay for a used one. Do you know if you'll have to pay to have it programmed?

The b1446 have you checked for a broken wire or connector? Is it wet inside the light or connector? I'd check all my light connectors if you haven't. Maybe leave them unplugged to see if it's causing a weird problem with the electric system

B1446:15 Front Park Lamps Output: Circuit Short To Battery or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the front parking lamp output circuit.


Also I found this.. one relating to pcm not updating

 

[MarkM]

Check ebay for a used one. Do you know if you'll have to pay to have it programmed?

The b1446 have you checked for a broken wire or connector? Is it wet inside the light or connector? I'd check all my light connectors if you haven't. Maybe leave them unplugged to see if it's causing a weird problem with the electric system

B1446:15 Front Park Lamps Output: Circuit Short To Battery or Open A continuous memory and on-demand DTC that sets when the BCM detects an open from the front parking lamp output circuit.


Also I found this.. one relating to pcm not updating

Yes the BCMs need programmed unfortunately and I’d have to pay for that!

I’ll check all connectors, all lamps are functioning and that code is gone

regarding that I for about pcm not uodating, I need to find out is that just a pcm problem
Or a sensor feeding it!?!

 

[DonnieO]

Could be a sensor. Pcm memory could be bad. I see used ones on ebay for about 300 usd. Not sure about where you're located. You might have moisture in the pcm.

 

[MarkM]

Could be a sensor. Pcm memory could be bad. I see used ones on ebay for about 300 usd. Not sure about where you're located. You might have moisture in the pcm.

Moisture would be very unlucky, it’s done about 500 miles this last year and lives in a heated garage lol

Ok, I’m assuming this voltage fluctuation isn’t right? On the numerical screen I saw it as high as 14.5v off throttle and 12.5v on.
Idling went down to 12.3v

 

[DonnieO]

Shouldn't be that low. 14s at least

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