2018 f350 dually advance trac and hill descent unavailable ?

[Smokin 6.0]

I’ve been having issues with my truck surging and unable to pinpoint why. It will stop when the cruise is set. Today got a message for advance trac and hill decent unavailable and the wrench light and the truck would barely move with the pedal pushed. Shut off and restarted and it seemed ok for the next few miles until I got wheee I was any ideas ?

 

[6.0 Tech]

What codes do you have?

 

[Smokin 6.0]

P2122
P2138
U3013
U0401

I have replaced the accelerator pedal a few months ago with a OEM Motorcraft pedal. This didn’t help the surging. But today is the first day I got anything like this

 

[6.0 Tech]

Those are throttle pedal codes. I just went thru a similar issue on my 6.0, turned out to be a loose pin in an inline connector that seemed fine when testing it, but I tightened it out of frustration and fixed my issue. I’ll have to look at the wiring diagrams tomorrow at the shop, and see if I can’t help you out a bit

 

[Smokin 6.0]

Please. I changed the pedal and am not sure where else to go with it

 

[6.0 Tech]

So I don’t normally look at u codes, as they’re typically bs codes. But that u3013 is a voltage code at the bcm. Could be causing your issue, unless you had either killed the batteries at one time, or jump started it. Depending on sub code, be it a 16 or 17, indicates which way the voltage was, 16 being low voltage, 17 being hi voltage. So for shits and grins, check alternator voltage, as well as ac voltage at the batteries. Dc volts should be 13.x-14.6, typical charging volts, if you see over 15, got an issue, ac voltage should be less than .1v if I remember right.

There is an inline connector, being connector 219, which looks to be under the brake booster, check it for issues and pin fit. I’ll attach pictures of the connector face, and location, ans well ans the wiring diagram for it. Also check pin fit at the pedal. The first code is for app d circuit, I’m not really sure which one that is, the second code is a discrepancy between the 2 position sensor readings.

Hopefully this helps some.

 

[Smokin 6.0]

I checked that connector and everything seemed tight and looked good. Hoped in it hooked to 23k+ pounds and drove it back home 400 miles and was fine. Seems fine under heavy load but light load and no trailer seems to always want to surge like it’s running out of fuel. Now that we’re back home I’m going to tinker alittle before biting the bullet and going to Ford. Just know that the electrical issues can rack up $$$ quick if it’s intermittent

 

[Smokin 6.0]

Speed sensor on the rear axle maybe ?

 

[PSD-BLACK-CLOUD]

From my experience these trucks do some dumb things when the batteries start going out. Even if you have one dead cell and it starts fine. Disconnect the batteries and test them. If they are good i would start checking wiring. When my 20 started having problems it was because a battery cracked and leaked on the harness that runs under it. That harness shorted out and caused a lot of issues till we finally found it.

 

[Smokin 6.0]

Shouldn’t I get a light though for a battery issue ?

 

[6.0 Tech]

Not always, had plenty of trucks that one day just won’t crank. Also had many that are just at the threshold of bad on voltage, so don’t throw the light on. There is also a symptom for battery light never on, had a few of those. I would definitely check over the harness, especially with your blower issue, and as deezuz said in that thread, look for rodent tell tales, feet marks, scratch looking marks, piss stains, actual shit, on the intake, under the lower intake, any spot there looks like there could be a nice curl up and sleep spot.

 

[DEEZUZ]

Usually you take the fender wells out and you find the areas that are chewed. If that is your issue but in this case it sounds like this truck has electrical issues.

Florida..? Peel the carpet up. Look for sand...

 

[Smokin 6.0]

Figured out the AC blower. The plug to the blower motor has been hot and looks discolored. I moved it around and it works now. The pins on the blower look fine just the connector. I’ll get a new one and replace it. I checked the batteries with it sitting and have 12.6 on both. 14.7 while charging. I’ll need to load test them. They are original and 7yrs seems like there near end of life so maybe. I haven’t dealt a lot with stuff like this just seems odd that the surging would be the only thing being caused by the batteries.

 

[DEEZUZ]

They're all hot and discolored after use. Maybe your contacts had a bit more moisture on them their entire life.

I still want you to pull carpet up and check if this thing was a flood truck. Lol.

 

[Smokin 6.0]

lol I know it wasn’t. I’ve got the vehicle history and know where it came from

 

[Smokin 6.0]

So checked everything last night with Forscan throttle position sensor, wheel sensors etc.. and everything looks good. He’s where it gets interesting. I monitored battery voltage with the truck off and key on for roughly 2-3 minutes voltage dropped to 10.4 I started the truck and it came up to 12.6 then about a minute later 14.1 then I started to drive and it settled in at 14.0 and didn’t go away from that the rest of the time I was driving

 

[6.0 Tech]

Have you checked ac voltage at the batteries yet? Also, is this a dual alternator truck, or single?

 

[Smokin 6.0]

I haven’t checked AC voltage. And it’s a single alternator

 

[Smokin 6.0]

So now my AC doesn’t work. I pulled the plug on the blower and it was all melted and hot looking. My issue kinda acts like a torque converter lockup solenoid maybe ?

 

[6.0 Tech]

Well that sucks in the blower motor, but at least it should be fairly easy to fix.

It could be a lock up solenoid, but that doesn’t explain the throttle codes. Also, a lock up solenoid freaking out, may attempt to lock up at idle and kill the truck.