AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Generic - U1950

U1950 Code - UPB Communication Bus Fault

- Code Popularity: 29,807 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC U1950?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • UBP Bus wiring intermittently open/shorted to power or ground
  • Faulty / intermittent electrical connection at any of the controllers on the UBP network
⚠ Does your Car have Safety Recalls? → Check here

How to Fix the DTC U1950?

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

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.

Search for U1950 Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1950 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the 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 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

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

Need More Information on the Code?

Need more information on how to fix the U1950 code? Get Access to Factory Service Manuals

Information for Specific Makes

Need Help with the Code?

Get the U1950 code diagnosed by a professional: Find a repair shop in your area

Code U1950 comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U1950 code? Have you replaced any parts?
Any information is appreciated. Thanks