This is driving me nuts, I have never in my life paid a dealership to fix a rig, but I am about to do it.......
05 F350 CC SRW 6.0, 120K miles, bought it from a dealership. It is a very nice, well taken care of truck. No problems when picked up.
Long story short, I put 2000 Excursion axles under it when I swapped out my custom lift that needed the axles.
One or two short drives, everything was fine.
Then the ABS light came on, no other issues except that no ABS all winter.
I drove it maybe 1500 miles like that, then coming back from a long trip, speedo stopped working and power went away. Truck seems to go into limp mode, drivable but won't go up a hill to save it's life. The only other strange thing that I did notice from the beginning was that the speedo reads low. With 4.89 gears and 38" tires, it SHOULD read slightly high, as I am undergeared from stock. I figured something to do with the different axles having a different tone ring or ?? I used the 05 VSS in the 2000 axle.
I pulled two codes, P0500 and P0528.
1) Tried 2000 VSS sensor. No change.
2) Replaced VSS and VSS wire harness with new 05 parts. No change.
3) I have continuity from VSS sensor plug to harness in engine bay. Making sure that I have it from engine bay harness plug to ECU plug now.
4) I put a meter on the front abs sensors, they both make ac voltage when wheel is spun. (Using the 2000 axle sensors.)
5) Did the gauge sweep test, gauge seems fine.
6) Front ABS sensors read 672 and 694 ohms.
The 528 code is for a fan sensor, which from reading seems that is related to the VSS wire? So either 528 code from the VSS system bad or from fan being bad causing the whole issue?

Any help appreciated, I don't want to throw parts at this thing and hate paying people to fix my rigs.
Chris

 

I dont think P0528 has nothing to do with the VSS or ABS. Focus on the P0500.

Is it possible that you're not getting a good ground on the axle housing you installed?

 

What?
Never seen a grounded axle before, what exactly would it ground to/through?

 

The springs? IDK, just grasping at straws here.

 

The VSS doesn't need the axle to be grounded. The VSS has two wires, it does not ground through the axle.

 

Mark, I may have asked you on another forum, if the green/black wire IS grounded, does that point to anything specific? (Other than obvious rub to frame, which I don't have.)

 

Subscribing, as I have been having P0500 troubles since I bought my truck.

I have read somewhere the the VSS signal goes to the ABS module, then the ABS module sends the signal to the PCM. One truck owner had a bad wire somewhere between the ABS module and the PCM, he ended up having to make a new wiring harness between the two.

Might be worth getting (borrowing) a reader that will read ABS codes and see what comes up.

 

Heh, way ahead of you. Ordered one yesterday, need to go grab it from my wife's salon and see what it tells me.
Between the ECU and PCM? That will be fun. I traced between sensor and the plug to the short harness to the ECU, but no further. I couldn't find the wire on the ECU plug to test.

 

U1900
C1175 bad rear left wheel sensor
C1233 left front wheel sensor
C1234 right front wheel sensor
C1236 left rear wheel sensor

Sounding like an ABS module or broken wire in the engine compartment?

 

It does seem odd that it is showing a problem with the front sensors.

This might be worth a read
P0500-VSS fault fixed with help of AE

This wasn't the instance that I mentioned before, but very similar. What's interesting is that he does not mention the ABS light. This is making me think that if the ABS module is getting a good signal from the sensor, but not relaying it to the PCM, then the ABS light will not light up, if the ABS sensor is not getting a signal, then the ABS light will light up.

Also, I finally got mine fixed tonight, it was a broken wire just behind the fuel filter on the frame fail, as soon as I fixed the break in the wire, the ABS light no longer came on. I wish I had a tool the read ABS so I could have know what the codes were.

Would any member on here that has and ABS reader be willing to disconnect their VSS and see what codes are present? If disconnecting the VSS triggers a C1175 & C1236 but not the other front sensors, then I would say you ABS module is at fault. If disconnecting the VSS triggers all four, then I would say wiring between the VSS and ABS module.

 

I went through a pinpoint test that I found online, everything tested good except that my voltage out of the ABS module was borderline, then went up by itself when testing. And my vss short to ground disappeared for some reason. Cleared codes, truck was fixed for ten miles, then ABS came on like happened originally, but so far have speedo and full power. I think I have a wonky ABS module, should probably just replace it.

 

Hey guys, Is the green/black supposed to be grounded?