AutoCodes – Generic – U1950

U1950 Code - UPB Communication Bus Fault

Quick Answer

The Anti-lock Brake System (ABS) module, the Powertrain Control Module (PCM), the Transmission Control Module (TCM), the instrument cluster and the parking aid module are just some of modules that communicate over the UART Based Protocol network bus or UBP Bus. Common causes include UBP Bus wiring intermittently open/shorted to power or ground, Faulty / intermittent electrical connection at any of the controllers on the UBP network. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U1950 indicates UPB Communication Bus Fault.
Common causes: Common causes include UBP Bus wiring intermittently open/shorted to power or ground, Faulty / intermittent electrical connection at any of the controllers on the UBP network.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 30,741

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 09, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code U1950 Description

The Anti-lock Brake System (ABS) module, the Powertrain Control Module (PCM), the Transmission Control Module (TCM), the instrument cluster and the parking aid module are just some of modules that communicate over the UART Based Protocol network bus or UBP 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 U1950 will set.

OBDII Code U1950 - UPB Communication Bus Fault - AutoCodes.com — U1950 Code - UPB Communication Bus Fault

What does this mean?

What are the Possible Causes of the DTC U1950?

UBP Bus wiring intermittently open/shorted to power or ground
Faulty / intermittent electrical connection at any of the controllers on the UBP network

How to Fix the DTC U1950?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

This is typically an electrical wiring connection issue at one of the controllers being monitored by the manufacturer.
It can occur if:
Wiring to the module becomes shorted by the module.
Wiring to the module becomes shorted between modules, such as where wires are routed on passenger side floor rails and become water soaked. Watch for water intrusion when this occurs.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1950 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

U1950 Ford — UPB Communication Bus Fault
U1950 Lincoln — UPB Communication Bus Fault
U1950 Mercury — UPB Communication Bus Fault

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.