Intermittent fault on instrument cluster

U1900 FORD - CAN Communication Bus Fault

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

Pull the fuse and put it back in, first. Then pull the plug on the back of the IP and put it back in. It is intermittent. These will usually fix the problem... Corrosion.

You mean it cranks but does not start, right ?
The NoBus on the display means the cluster is not talking to the computer. That could be a wiring problem or a component problem.
Have you checked the engine computer for trouble codes ?

Alot of times, this concern has to do with the solder joints on the Cluster. If you take it out and resolder those joints or have them resoldered by someone else, it might just fix your problem. Especially, if this code is accompanied by intermittent gauges and cluster operation.

This Seems Indicative Of a Poor Connection AT The CLUSTER Or A Junction Connecter Close to the Cluster. This is Assuming you Have Ruled OUT ALL ABS COMPONENTS, LOOK at These VERY CLOSLY Because of the Small Volts These Wires Carry , the SMALLEST DEFECT WILL Cause this Type of Symptom that you have given. Please try all of the Above, I feel Confedint that athis is where your Problem Is.

main computer board going bad

check the connectors on the back of the cluster,and the solder joints on the pc board.these are known for being intermittent on the 97 to 2000 cherokee.also check the gauges fuse in the fuse panel

check fuel filtres and clean lines

Unfortunately I believe this can not be done because the sensor for idiot lights are different from the sensors for gauges. I don't know this for an absolute fact but in most instances this is true.

Its the starter solenoid. Remove 2 bolts and the lead wire and pull the starter out. most local parts stores can test the starter for you, but if the problem is intermittent it might not show up during their test.

On my jeep, after pulling the starter, I disassembled the solenoid. The actual failure of the solenoid was the electrical contact. I cleaned off the corrosion and have had no problems for 40,000 miles.