Wheel Speed sensor issues

[Ed Kennedy]

I got the whole "Hill Start" "precollission" crap a few weeks ago and I replaced all my wheel speed sensors. That fixed the issue but now it's back after just a couple weeks. Another issue possibly? I can't determine which one it is without taking it to a shop. Ideas? 2019 StX

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[airline tech]

You will need to get a scanner on it and see what the code is and sometimes the code will reset at key cycle so the message needs to be active while checking for codes.

When you replaced the sensors did you inspect the holes the sensor mounts in and check for debris on the encoders, more so on the rear sensors?

There is more to the system than the Wheel Speed Sensors & ABS Module
and with it being a STX I assume you do not have adaptive cruise so you do not have the Cruise Control Module (CCM) and it only uses the IPMA (Windshield Camera)
With Adaptive Cruise - it uses both the CCM & IPMA

So the main modules are the ABS & IPMA and if installed the CCM, but the system also uses other inputs.

You replaced the most likely (Sensors) but a wiring issue or encoder blockage issue appears to be still present (if sensor related)
This is where the truck needs to be scanned to pinpoint which sensor is faulting

 

[Ed Kennedy]

Thanks! it's under warranty so I'm just shipping it back to the dealer to solve if it's possibly electrical etc. I only deal in easy stuff lol. But everything was clean and appeared in good shape with the sensors. I cleaned up around them before pulling them and didn't see any wear or trash. It's dusty here so I'm wondering if dust could be causing it if something isn't sealed off but I don't know.

 

[Ed Kennedy]

I ran a scan on it and got no codes ABS or otherwise. Can't get into the dealer for another week, so going to pull the sensors and double check cleaning. Then trace wiring I guess....also pulling the cheap spacers that are on it (not needed) to see if it's possibly cause a slight vibration.

 

[airline tech]

Was the messages active when scanned?
When does the messages pop up? At Engine Start or When you begin driving, just after start?

What specific messages are popping up?

 

[Ed Kennedy]

They are active when I turn on the truck, ABS, Hill Start, Trac messages all scroll

 

[airline tech]

Then it is a hard fault and most likely the ABS Module has lost an input, the problem is its looking at multiple inputs from the other modules.

Your scanner might not be able to pick up - the Communication loss codes.
But I think you have a power issue to the ABS Module or a Loss Of Communication issue, if this is happening on start up.
If this is also now perm locked code - you might check the 2 ABS Module fuses, #69 & #82 on the bottom side of the Batt Junction Box (Eng Bay Fuse Box) as well as Fuse #19 (PSCM) and if you have something tapped off of that fuse (remove it) and see if that makes a difference - as one of the major inputs to the ABS Module is the PSCM.
I would also check the fuse & connection from the 125-AMP fuse on the BMFL (Top of Battery) it feeds the PSCM as well.

Just some possible spots to check without a scan tool direction (code) as the messages you are getting can be from numerous points of failure.
I believe it should be coding something and needs a scan tool that can read all codes, if you have that then its going to need a live data PID monitor to see what is lost power or communication.

 

[Ed Kennedy]

I gave you bad info....I said ABS scrolled but it was pre-collision, hill start, and trac. I've cleaned the sensors (weren't dirty and no metal etc. Disconnected battery as well and still getting the error scroll at start. My ABS scan shows no codes and I'm getting nothing at all from the scanner (Innova handheld with ABS). Scanner has always found an ABS module issue with my other cars when bad so I don't know....wiring harnesses all looked good and wiring still has all wrap on it with no damage anywhere I could find. Could a drive shaft or some other vibration cause set it off to the point of no reset with the sensors? I'm starting to think the slight vibration at 65/70 mph is the symptom of the issue maybe?? I pulled off the cheap spacers to get better wheel contact but haven't driven it yet.

 

[RangerBill]

I gave you bad info....I said ABS scrolled but it was pre-collision, hill start, and trac. I've cleaned the sensors (weren't dirty and no metal etc. Disconnected battery as well and still getting the error scroll at start. My ABS scan shows no codes and I'm getting nothing at all from the scanner (Innova handheld with ABS). Scanner has always found an ABS module issue with my other cars when bad so I don't know....wiring harnesses all looked good and wiring still has all wrap on it with no damage anywhere I could find. Could a drive shaft or some other vibration cause set it off to the point of no reset with the sensors? I'm starting to think the slight vibration at 65/70 mph is the symptom of the issue maybe?? I pulled off the cheap spacers to get better wheel contact but haven't driven it yet.

It sounds like your scan tool isn't reading all the DTC codes on the Ranger. Forscan is a free program that runs on a Windows laptop and an OBDII adaptor (about $50). I would download the program and buy an adaptor so you can read your DTC codes. With your symptoms, you should have stored DTC codes.

 

[Ed Kennedy]

I'll check it out. Mine connects to my computer as well and should pull anything ABS related but I'm getting nothing. I may just have to wait on the dealership. Appreciate the info!!!

 

[Ed Kennedy]

ABS Module are we talking about the modulator valve? I had assumed that's the ABS module but want to be sure, that sucker is crazy expensive! Easy to change out though so I'll be positive about it lol.

 

[RangerBill]

ABS Module are we talking about the modulator valve? I had assumed that's the ABS module but want to be sure, that sucker is crazy expensive! Easy to change out though so I'll be positive about it lol.

I wouldn't throw parts at it. Get the codes to see what the problem is.

 

[airline tech]

Noted: No ABS Light or Message:
I still think you need a higher level of scanner - even Forscan should see the code its generating.

I have a feeling either the IPMA has a fault or one of the new wheel speed sensors is faulty, and you need view the code to pinpoint it down.
It is most likely going to be a (C) Chassis code, plus a scan tool will show Live Data PIDs of the wheel speed sensors - you can view which one is dropping out (If faulted)

 

[Ed Kennedy]

Oh, I'm definitely waiting on the scanner to come Monday. I'm feeling pretty confident it's the ABS module now as the ABS light and trac light are on. But I'll definitely scan it before trying to pay for parts. Appreciate all the advice! It's frustrating but I'd rather figure it out and fix it now as my warranty isn't going to cover it like I thought. Had this same stuff with my jeep a couple years ago. If I get lucky and it's just a sensor, great! Those I purchased have a lifetime warranty.

 

[RangerBill]

Oh, I'm definitely waiting on the scanner to come Monday. I'm feeling pretty confident it's the ABS module now as the ABS light and trac light are on. But I'll definitely scan it before trying to pay for parts. Appreciate all the advice! It's frustrating but I'd rather figure it out and fix it now as my warranty isn't going to cover it like I thought. Had this same stuff with my jeep a couple years ago. If I get lucky and it's just a sensor, great! Those I purchased have a lifetime warranty.

If you do find a bad wheel speed sensor, I would buy a genuine Ford replacement part. It sounds like you bought aftermarket wheel sensors.

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