1. Inconsistent Brake Pedal Pressure / Feel
This is not normal and usually results from:
Faulty brake pressure sensors (especially the primary circuit pressure sensor).
An ABS module misinterpreting data or inconsistently applying logic based on sensor inputs.
Moisture or electrical interference (possibly from humidity or water ingress).
2. ABS Not Activating During Soft Pedal Condition
This suggests that the ABS system does not perceive the braking force as being sufficient to trigger ABS, possibly due to:
Inaccurate readings from the master cylinder pressure sensor or wheel speed sensors.
Internal ABS module logic error, leading it to misjudge required braking intervention.
The system may be in a degraded mode, affecting how it applies hydraulic pressure.
3. Brake Controller Over-Braking the Trailer
This one’s a big safety red flag:
Most likely due to fluctuating pressure sensor data, the system is telling the trailer brake controller that you’re braking hard.
Since trailer brake controllers (especially factory-integrated ones) work off brake pedal pressure or position data, false input causes erratic trailer brake behavior, resulting in the "snatching."
4. Problem Resets After Disconnecting the Battery
This supports the idea that the ABS module or related logic is “learning” or interpreting bad sensor data.
Battery disconnect likely resets adaptive values or clears temporary faults.
The issue returning after a few days implies the problem is cumulative—a sensor starts to give bad data, the module adapts to it incorrectly, and the issue reappears.
5. Rain or Washing the Truck Temporarily Fixes It
This is very unusual but strongly suggests:
Humidity or water may be improving electrical conductivity across a problematic connector.
A specific sensor (pressure sensor, ABS module connector, or wheel speed sensor) is intermittent or has corrosion, and the moisture is providing a temporary fix by completing or stabilizing the connection.
Most Likely Root Causes
1. Faulty primary circuit pressure sensor
If it’s reporting wrong pressure values, the ABS and brake controller logic will go haywire.
2. Internal ABS module fault or software issue
Especially since the issue is “reset” by a battery pull. A software update (if available) or replacement may be needed.
3. Corroded or failing connector (ABS block, master cylinder sensor, wheel speed sensors)
Given that washing the truck temporarily helps, you could be dealing with a flaky electrical connection.
The primary brake pressure sensor should give a stable, low reading (usually 0 to 0.1 V or equivalent pressure units) when the pedal is at rest.
Fluctuation between 0 and 0.2 (or higher), especially while at rest, is not normal and will absolutely confuse the ABS module, causing:
Inconsistent brake assist
Erratic pedal feel
Faulty ABS or trailer brake modulation
And possibly lead the system to think you're riding the brake (or not braking) when you actually are.
When it stabilizes at 0.12, the ABS logic assumes a consistent light foot pressure — which allows the system to behave somewhat normally.
When it drops to 0 or jumps around, the system may:
Misinterpret braking effort
Fail to engage ABS when needed
Overcompensate on trailer brakes
The fact that you can correlate a better pedal feel with a stable 0.12 reading points directly to that sensor—or its wiring—as the root cause.
But I'm the idiot...this is not normal and the fact that you think it is shows just how little either of you understand the system and how it works. Sounds like I understand it far better. Sensors are not supposed to send erratic data. I'd be willing to put money on it, if I put a scan tool on every truck that experiences this issue, the primary circuit pressure sensor is acting exactly like mine is. Bouncing all over the place.
These systems are obviously very sensitive and any voltage fluxuation will confuse it. As to what is causing the erratic data is beyond me but I have been working very closely with the service manager and their director of operations. They agree it's not normal. For whatever reason, the sensor data was never looked at before or after the module was replaced. I take it in Monday morning and I have a pile of diagnostic data to give them. I'm not just a truck owner. I'm a business owner, a lifelong mechanic and have spent many years working for the dealership with technicians. Which is why I took the time to do all of this. Having my truck in the shop more than it already has been, making payments on it and the ungodly rates to rent an hd truck to tow my work rig is not feasible. I do not have all the answers nor do I pretend to, but I do know how to properly diagnose. Every aspect of my life I have had to rely on myself. This is no different.
My efforts to post this here is to HELP, to solve the problem. Not accepting the ******** lazy excuse that this is normal, get used to it. My 2023 Duramax did not have this issue. Ford doesn't have this issue and call it normal, because it's not. If they can't fix it (not much of a dealership if they can't) I will let it go. These are not the first trucks/ vehicles with this technology yet to my knowledge they are the first to have this issue.
The "idiot" "sport" etc is unnecessary, immature and completely defeats the purpose of this forum and unless you have some first hand knowledge from the manufacturer saying they intentionally designed them to function this way, keep quiet. We're trying to solve a problem. Ram is known to ignore problems like these. I have contacted the state to start a case for a potential recall. You know, the things responsible adults to when there's safety issues with new (ish) vehicles. I would encourage everyone who has this issue to do the same as it will escalate it that much faster. Listening to the ******** I got today gets us nowhere.
Enjoy the novel, I'll be back next week with an update for the folks who refuse to accept it as normal.
