AutoCodes – Mercury – U1950 Mercury

U1950 Mercury 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 Mercury 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 1,975

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
FAQs
Comments
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Code U1950 Mercury 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 Mercury - UPB Communication Bus Fault - AutoCodes.com — U1950 Mercury Code - UPB Communication Bus Fault

What does this mean?

What are the Possible Causes of the DTC U1950 Mercury?

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 Mercury?

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 Mercury 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.

Need more information about the U1950 Mercury code?

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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.

Frequently Asked Questions about U1950 Mercury Code

1. What are the common symptoms of OBDII code U1950 in a Mercury vehicle?

The common symptoms of U1950 code include issues with the vehicle's communication system, such as difficulty starting the engine, erratic shifting, and dashboard warning lights illuminating.

2. What does the U1950 code in a Mercury indicate?

The U1950 code signifies a communication bus fault within the UPB (Universal Powertrain Bus) system of the vehicle.

3. What are the potential causes of the U1950 code in a Mercury?

Common causes of the U1950 code include damaged wiring or connectors in the communication bus system, faulty control modules, or a malfunctioning UPB module.

4. How can I diagnose the U1950 code in my Mercury?

Diagnosing the U1950 code typically involves using an OBDII scanner to retrieve the code and then inspecting the UPB communication system components for any visible damage or issues.

5. Can I continue driving my Mercury with the U1950 code present?

It is not recommended to drive your Mercury with the U1950 code active, as it can lead to performance issues and potential safety risks. It is best to address the underlying problem promptly.

6. Is the repair for the U1950 code in a Mercury expensive?

The repair cost for the U1950 code can vary depending on the exact cause of the issue. Simple fixes like repairing wiring may be more affordable, while replacing control modules can be more costly.

7. Can I repair the U1950 code in my Mercury myself?

Repairing the U1950 code may require advanced automotive knowledge and specialized tools. It is recommended to consult a professional mechanic for an accurate diagnosis and repair.

8. How long does it take to fix the U1950 code in a Mercury?

The repair time for the U1950 code can vary based on the complexity of the issue and the availability of replacement parts. It may take a few hours to a full day to resolve the problem.

9. Will resetting the OBDII code U1950 in my Mercury make it go away permanently?

Resetting the code without addressing the underlying issue will not permanently resolve the U1950 code. The problem will likely reappear until the root cause is fixed.

10. Is the U1950 code specific to Mercury vehicles, or can it occur in other car makes?

The U1950 code is specific to Mercury vehicles and may not apply to other car makes. However, similar communication bus faults can occur in other vehicles with different fault codes.