AutoCodes – Mercury – U0122 Mercury

U0122 Mercury Code - Lost Communication With Vehicle Dynamics Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Vehicle Dynamics Control Module, Vehicle Dynamics Control Module harness is open or shorted, Vehicle Dynamics Control Module circuit poor electrical connection. 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: U0122 Mercury indicates Lost Communication With Vehicle Dynamics Control Module .
Common causes: Common causes include Faulty Vehicle Dynamics Control Module, Vehicle Dynamics Control Module harness is open or shorted, Vehicle Dynamics Control Module circuit poor electrical connection.
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 653

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 Mar 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0122 Mercury Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Vehicle Dynamics Control Module has not been received.

OBDII Code U0122 Mercury - Lost Communication With Vehicle Dynamics Control Module - AutoCodes.com — U0122 Mercury Code - Lost Communication With Vehicle Dynamics Control Module

What does this mean?

What are the Possible Causes of the DTC U0122 Mercury?

Faulty Vehicle Dynamics Control Module
Vehicle Dynamics Control Module harness is open or shorted
Vehicle Dynamics Control Module circuit poor electrical connection

How to Fix the DTC U0122 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0122 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.

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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 U0122 Mercury Code

What does the OBDII code U0122 mean?

U0122 indicates that there is a lost communication issue with the Vehicle Dynamics Control Module, which can affect the vehicle's stability and traction systems.

What are common symptoms of the U0122 code?

Common symptoms include the illumination of the check engine light, issues with traction control, stability control, or anti-lock braking systems, and possible erratic handling of the vehicle.

What could cause the U0122 code to trigger?

Causes can include a faulty Vehicle Dynamics Control Module, damaged wiring or connectors, issues with other related control modules, or a blown fuse affecting communication.

How can I diagnose the U0122 code?

To diagnose U0122, use an OBDII scanner to confirm the code, then inspect the wiring and connectors for damage, test the Vehicle Dynamics Control Module, and check for related fault codes.

What repair steps should I take if I have the U0122 code?

Start by checking and repairing any damaged wiring or connectors. If those are intact, test the Vehicle Dynamics Control Module for proper operation. If it is faulty, replacement may be necessary.

Can I drive my vehicle with the U0122 code?

While you can drive your vehicle, it is not recommended due to potential issues with stability and traction control systems that could affect handling and safety.

How much might it cost to fix the U0122 code?

Repair costs can vary widely depending on the cause, ranging from a simple wiring fix costing under $100 to a replacement of the Vehicle Dynamics Control Module, which could cost several hundred dollars.

Are there any preventive measures to avoid the U0122 code?

Regularly inspect and maintain vehicle wiring and connectors, ensure proper installation of aftermarket components, and address any warning lights promptly to help prevent communication issues.

Is the U0122 code specific to Mercury vehicles?

No, the U0122 code is a generic OBDII code that can appear in various vehicle makes and models, not just Mercury.