AutoCodes - Generic - U1950

U1950 Code - UPB Communication Bus Fault

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U1950 code possible causes

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

|How do I fix the U1950 code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|U1950 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.

|Cost of diagnosing the U1950 code

Labor: 1.0

The cost of diagnosing the U1950 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the U1950 code detected?

When the controllers are unable to communicate with each other at any time while the ignition switch is turned to the “Run” position.

|What are U1950 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine won’t start – won’t crank
  • ABS Warning Light ON
  • Transmission may shift erratically
  • Cluster won’t register any reading

|U1950 code 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

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|U1950 code comments

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