Intermittent problem with brakes, sometimes the

U1900 FORD - CAN Communication Bus Fault

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Possible causes
Faulty / intermittent ignition switch connections
CAN Bus wiring intermittently open/shorted to power or ground Faulty / intermittent connection at PCM
Faulty electrical connections at ABS Control Module
Faulty electrical connections at the instrument cluster
Poor connections at the trailer brake controller/trailer connector

Tech notes This is typically a false/intermittent code. It can occur if: Someone hooks up a scanner to the OBDII port while the ignition is on or while the engine is idling. A trailer brake system is installed improperly/incorrectly on a truck with ABS (anti-lock brakes).

When is the code detected? When the PCM, Brake Controller and Instrument Cluster are unable to communicate with each other at any time while the ignition switch is turned to the "Run" position, code U1900 sets in memory.

Possible symptoms Engine Light ON (or Service Engine Soon Warning Light) Amber ABS (Anti-lock Brakes) Light ON Wrench Light On

U1900 Ford Description The Anti-ock Brakes System (ABS) module, the Powertrain Control Module (PCM), and the instrument cluster communicate over the Controller Area Network (CAN) Bus. This is a high-speed bus communication system and is not fault tolerant, which means any type of intermittent/loose connection between these 3 controllers will cause communication to stop. When the PCM, ABS module and instrument cluster are unable to communicate with each other at any time while the ignition switch is turned on, code U1900 will set.

Read more: https://www.autocodes.com/u1900_ford.html

Does it have ABS - anti lock brakes ? Unwanted ABS Activation Diagnosis 2005 Buick Rendezvous Anti lock Brake... Chevy Truck ABS Problems Unwanted ABS Activation

Could be that the callipers are jamming or the wheel is running tight. Check for wheel spin with the front wheels off the ground, they should spin with minimum effort. Could also be something wrong with the master cylinder. It may not be releasing properly and slowly building pressure to lock the brakes. After sitting for a while, it returns to normal position and releases the brakes. Mt Ford had a dud wheel bearing which would intermittently start to seize. When this happened, the anti lock braking system thought that the wheel was about to lock and would throw the brakes on and off without warning... Check your wheel bearings too.

metal on metal possible will need brake pads and rotors ---as to abs activaction hub goiging bad abs sensor going bad but if driving and the ice and snow and abs activate then thats normal and the sound is the worn brakes

Peddle jumping is your anti lock brakes activating. Rumbling could be anti lock recycling or your brakes are grinding and need replacing

If the oil pump was bad, it would most likely stay on, but if you have a plugged oil pick up tube, then it would be intermittent. Just have to pull the pan, pull off the pickup tube, clean it out real good and put it back on and you will be good.

I would think a sensor is going bad , but ,without testing that is just a guess , just like the dealer tech , assuming it's a module or a fuse ! With the light's on checking for DTC'S - diagnostic trouble codes would be a real good first step . The dealer tech should have hooked up the Tech 2 scan tool an checked codes an look at sensor data parameters ....

a sensor on one of the axles may have come loose & is being ground away!!
urgent inspection needed!!!
Cheers Rob

One of the sensors has gone bad and needs to be replaced, the other thing to that would also do that is the ABS sensor is dirty or needs to be re gaped to the speed ring on the hub. There was a issue bulletin with your Tahoe on the ABS activating under 8 km/h. Good luck and hope this helps, if not clean out the sensor with brake parts cleaner and check the wire harness and ABS sensor bracket. Re gap the sensor to the speed ring hub. Here is the bulletin. Anti lock Brake (ABS) Activation at Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #03-05-25-007C - (05/16/2006) 2001-2006 Chevrolet Suburban, Tahoe

First, is the ABS light on? Does it come on when it's doing it? Make sure the brake fluid is full, and the brakes are still servicable, ie, pads still have meat on them. If so, the abs control module or a speed sensor might be on the way out. This is a safety issue, and I would recommend getting the truck to a good mechanic to have it checked out.