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AutoCodes – Mercury – U0200 Mercury

U0200 Mercury Code - Lost Communication With Door Control Module 'B'

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 Door Control Module 'B', Door Control Module 'B' harness is open or shorted, Door Control Module 'B' 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
U0200 Mercury indicates Lost Communication With Door Control Module 'B'.
Common causes
Common causes include Faulty Door Control Module 'B', Door Control Module 'B' harness is open or shorted, Door Control Module 'B' 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 399
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Apr 03, 2020
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Code U0200 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 Door Control Module 'B' has not been received.
OBDII Code U0200 Mercury - Lost Communication With Door Control Module 'B' - AutoCodes.com
U0200 Mercury Code - Lost Communication With Door Control Module 'B'
What does this mean?

What are the Possible Causes of the DTC U0200 Mercury?

  • Faulty Door Control Module 'B'
  • Door Control Module 'B' harness is open or shorted
  • Door Control Module 'B' circuit poor electrical connection

How to Fix the DTC U0200 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 U0200 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 U0200 Mercury code?

Need more information on how to fix the U0200 Mercury code? Get Access to Factory Service Manuals

Need Help with the 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 U0200 Mercury Code

1. What does the OBDII code U0200 mean for a Mercury vehicle?

The U0200 code indicates that the vehicle has lost communication with Door Control Module 'B', which manages functions like power locks and windows.

2. What are the common symptoms of the U0200 code?

Common symptoms include inoperative power locks, non-functional power windows, or erratic behavior of the affected door's electrical components.

3. What causes the U0200 code to appear?

The code can be triggered by a faulty door control module, damaged wiring or connectors, a blown fuse, or issues with the vehicle’s communication network.

4. Can a weak battery cause the U0200 code?

Yes, a weak or failing battery can disrupt communication between modules, potentially causing the U0200 code.

5. How do I diagnose the U0200 code?

Start by inspecting the wiring and connectors for damage, check fuses related to the door control module, and test the module with a scan tool to ensure it is responding properly.

6. Is the U0200 code specific to one door on the vehicle?

Yes, the 'B' in the code typically refers to a specific door or module. Check your vehicle's manual for exact identification.

7. Can I drive with the U0200 code active?

Yes, you can drive with this code active, but the affected door’s features, like locks or windows, may not function properly.

8. How do I fix the U0200 code on a Mercury vehicle?

Repairs may include replacing a faulty door control module, repairing damaged wiring, or addressing issues in the vehicle's communication network.

9. How much does it cost to fix the U0200 code?

Repair costs can range from $100 to $500, depending on whether the issue is a simple wiring repair or requires module replacement.

10. Can clearing the U0200 code fix the problem?

Clearing the code will reset it temporarily, but if the underlying issue isn’t resolved, the code will return.

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