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Engine-Codes – Generic – U1950

U1950 Code - UPB Communication Bus Fault

Quick Answer

The U1950 code indicates a fault in the UPB (Universal Passenger Bus) communication bus system in a vehicle. Common causes include Wiring or connection issues in the UPB communication bus system, Faulty control module connected to the UPB system, Corrosion or damage to the communication bus connectors. 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 Wiring or connection issues in the UPB communication bus system, Faulty control module connected to the UPB system, Corrosion or damage to the communication bus connectors.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U1950 Description

The U1950 code indicates a fault in the UPB (Universal Passenger Bus) communication bus system in a vehicle. The UPB system is responsible for facilitating communication between various electronic control modules in the vehicle, such as the airbag control module, body control module, and other passenger-related systems. When this communication bus malfunctions, it can lead to issues with the functionality of these systems, potentially compromising the safety and performance of the vehicle.

OBDII Code U1950 - UPB Communication Bus Fault
U1950 Code - UPB Communication Bus Fault

Common Causes of U1950

  1. Wiring or connection issues in the UPB communication bus system
  2. Faulty control module connected to the UPB system
  3. Corrosion or damage to the communication bus connectors
  4. Electrical interference from aftermarket accessories or modifications
  5. Software glitches in the vehicle's electronic control modules

Symptoms of U1950

  1. Dashboard warning lights related to airbag or passenger systems
  2. Non-functioning airbags or seatbelt pretensioners
  3. Erratic behavior of electronic components such as power windows or door locks
  4. Loss of communication with passenger-related control modules
  5. Decreased overall performance of the vehicle

How to Fix U1950

  1. Diagnose the specific cause of the UPB communication bus fault using a diagnostic scan tool
  2. Inspect the wiring and connectors in the UPB system for any signs of damage or corrosion
  3. Test the control modules connected to the UPB system for proper functionality
  4. Repair or replace any damaged wiring, connectors, or control modules as needed
  5. Clear the diagnostic trouble codes and perform a test drive to ensure the issue has been resolved

Cost to Fix U1950

The cost of repairing a UPB communication bus fault can vary depending on the specific cause of the issue and the extent of the damage. On average, the repair costs for this type of problem can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost may be higher or lower depending on the vehicle make and model, as well as the labor rates charged by auto repair shops in your area. It's recommended to obtain a detailed quote from a trusted mechanic or dealership to get a more accurate estimate for your specific situation.

What does this mean?

Tech Notes for U1950

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.

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.

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Code U1950 Information for Specific Makes

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.

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