Q: Engine light Problem

asked by on

Took my mustang too autozone they scan my car too se the codes in showing two problems 1. Anti-Lock Brake Control Module Malfunction Code: B1342

  1. Controller Area Network Commcation Bus Malfunction Receive Code: U1900

My car has 119000 miles.
My car has an automatic transmission.

U1900 is a communications failure and the other code is possibly setting simply because the controller (U1900) that is not reporting controls the ABS module. The circuits between the anti-lock brake system (ABS) module, the instrument cluster, the power train control module (PCM) and the trailer brake controller (if equipped) are all on the CAN (controller area network) referred to in this Code (U1900) and all of those will have to be tested. Sometimes, an instrument panel fault causes the code to set. The Factory Service Manual (FSM) sets out a "decision tree" to perform the diagnostic. If you obtain the FSM, you can use a scan tool and an ordinary volt ohmmeter to test for continuity and voltage drops along the identified circuits until the fault is found. A wiring fault (high resistance) can cause the codes to set and so it is only after the wiring is thoroughly checked that you start to consider a component malfunction. Most faults are wiring related though. If you want the necessary diagnostic steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an ABS system - controller area network malfunction diagnostic and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Engine light Problem

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Is buying a used Phaeton worth it?

I have owned 4 VW's in my lifetime. One was a 2003 Passat W8 with a 6 speed manual - one of 424 6 speeds ever imported to the US. When my dealership got their first Phaeton, I took one...

Q: Q: ABS and brake light is on

If the ABS warning light is on, that means that there are downloadable ABS diagnostic trouble codes, much like the codes you would download if you have a Check Engine Light diagnostic. The ABS trouble codes will give a general...

Q: Skipping, light rough idle, & smoking

Hi and thanks for contacting YourMechanic. Depending on what color the smoke is will determine what is happening with the engine. If there is heavy black smoke, then there is too much fuel in the cylinders and the fuel is...

Related articles

P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.