U0142
NetworkLost Communication With Body Control Module "B"
The engine control module has lost communication with Body Control Module B over the vehicle's data network, typically due to a wiring issue, connector problem, or module fault.
ⓘ Information only. This page provides general educational information about fault code U0142. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.
Recommended next steps
Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.
What does U0142 mean?
U0142 is a Network (CAN bus, module communications) fault code. It indicates: Lost Communication With Body Control Module "B".
This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
About ECU codes
Engine control unit (ECU) codes relate to the main engine computer itself, its memory, internal processors, supply voltage, or its ability to communicate with sensors and actuators. These are often electrical or wiring-related rather than mechanical faults.
U0142 is one of 1,108 codes in this category. Browse all ECU codes →
What we know about U0142 specifically
We record the SAE J2012 standardised definition and the system this code belongs to, but we have not yet published detailed driver-reported symptoms, common causes, or step-by-step diagnostic guidance for U0142.
Rather than invent that information by generating generic content from a template, we leave it out. For specific guidance, the most reliable sources are:
- •your vehicle's own service manual or manufacturer-specific technical bulletins
- •a qualified mechanic with a manufacturer-level diagnostic tool
- •a marque specialist familiar with your make and model
Codes nearby
Codes adjacent to U0142 in the U-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.
Other ECU codes
Other fault codes in the same system as U0142. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.
Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with U0142 can submit a correction or expansion. We review every submission before publishing, mechanic submissions are prioritised.
Information only, not professional advice
The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →